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![Jani Nikula](/assets/img/avatar_default.png)
Continue to get rid of drmP.h. Add minimal includes to build. Sort includes while at it. Reviewed-by: Noralf Trønnes <noralf@tronnes.org> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190506095248.20874-1-jani.nikula@intel.com
526 lines
15 KiB
C
526 lines
15 KiB
C
/*
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* Copyright © 2016 Intel Corporation
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
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* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/i2c.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <drm/drm_dp_dual_mode_helper.h>
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#include <drm/drm_print.h>
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/**
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* DOC: dp dual mode helpers
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*
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* Helper functions to deal with DP dual mode (aka. DP++) adaptors.
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*
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* Type 1:
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* Adaptor registers (if any) and the sink DDC bus may be accessed via I2C.
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*
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* Type 2:
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* Adaptor registers and sink DDC bus can be accessed either via I2C or
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* I2C-over-AUX. Source devices may choose to implement either of these
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* access methods.
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*/
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#define DP_DUAL_MODE_SLAVE_ADDRESS 0x40
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/**
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* drm_dp_dual_mode_read - Read from the DP dual mode adaptor register(s)
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* @adapter: I2C adapter for the DDC bus
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* @offset: register offset
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* @buffer: buffer for return data
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* @size: sizo of the buffer
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*
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* Reads @size bytes from the DP dual mode adaptor registers
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* starting at @offset.
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*
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* Returns:
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* 0 on success, negative error code on failure
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*/
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ssize_t drm_dp_dual_mode_read(struct i2c_adapter *adapter,
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u8 offset, void *buffer, size_t size)
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{
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struct i2c_msg msgs[] = {
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{
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.addr = DP_DUAL_MODE_SLAVE_ADDRESS,
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.flags = 0,
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.len = 1,
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.buf = &offset,
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},
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{
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.addr = DP_DUAL_MODE_SLAVE_ADDRESS,
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.flags = I2C_M_RD,
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.len = size,
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.buf = buffer,
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},
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};
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int ret;
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ret = i2c_transfer(adapter, msgs, ARRAY_SIZE(msgs));
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if (ret < 0)
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return ret;
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if (ret != ARRAY_SIZE(msgs))
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return -EPROTO;
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return 0;
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}
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EXPORT_SYMBOL(drm_dp_dual_mode_read);
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/**
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* drm_dp_dual_mode_write - Write to the DP dual mode adaptor register(s)
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* @adapter: I2C adapter for the DDC bus
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* @offset: register offset
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* @buffer: buffer for write data
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* @size: sizo of the buffer
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*
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* Writes @size bytes to the DP dual mode adaptor registers
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* starting at @offset.
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*
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* Returns:
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* 0 on success, negative error code on failure
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*/
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ssize_t drm_dp_dual_mode_write(struct i2c_adapter *adapter,
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u8 offset, const void *buffer, size_t size)
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{
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struct i2c_msg msg = {
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.addr = DP_DUAL_MODE_SLAVE_ADDRESS,
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.flags = 0,
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.len = 1 + size,
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.buf = NULL,
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};
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void *data;
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int ret;
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data = kmalloc(msg.len, GFP_KERNEL);
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if (!data)
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return -ENOMEM;
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msg.buf = data;
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memcpy(data, &offset, 1);
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memcpy(data + 1, buffer, size);
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ret = i2c_transfer(adapter, &msg, 1);
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kfree(data);
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if (ret < 0)
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return ret;
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if (ret != 1)
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return -EPROTO;
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return 0;
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}
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EXPORT_SYMBOL(drm_dp_dual_mode_write);
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static bool is_hdmi_adaptor(const char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN])
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{
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static const char dp_dual_mode_hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN] =
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"DP-HDMI ADAPTOR\x04";
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return memcmp(hdmi_id, dp_dual_mode_hdmi_id,
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sizeof(dp_dual_mode_hdmi_id)) == 0;
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}
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static bool is_type1_adaptor(uint8_t adaptor_id)
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{
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return adaptor_id == 0 || adaptor_id == 0xff;
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}
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static bool is_type2_adaptor(uint8_t adaptor_id)
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{
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return adaptor_id == (DP_DUAL_MODE_TYPE_TYPE2 |
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DP_DUAL_MODE_REV_TYPE2);
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}
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static bool is_lspcon_adaptor(const char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN],
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const uint8_t adaptor_id)
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{
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return is_hdmi_adaptor(hdmi_id) &&
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(adaptor_id == (DP_DUAL_MODE_TYPE_TYPE2 |
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DP_DUAL_MODE_TYPE_HAS_DPCD));
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}
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/**
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* drm_dp_dual_mode_detect - Identify the DP dual mode adaptor
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* @adapter: I2C adapter for the DDC bus
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*
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* Attempt to identify the type of the DP dual mode adaptor used.
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*
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* Note that when the answer is @DRM_DP_DUAL_MODE_UNKNOWN it's not
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* certain whether we're dealing with a native HDMI port or
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* a type 1 DVI dual mode adaptor. The driver will have to use
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* some other hardware/driver specific mechanism to make that
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* distinction.
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*
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* Returns:
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* The type of the DP dual mode adaptor used
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*/
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enum drm_dp_dual_mode_type drm_dp_dual_mode_detect(struct i2c_adapter *adapter)
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{
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char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN] = {};
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uint8_t adaptor_id = 0x00;
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ssize_t ret;
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/*
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* Let's see if the adaptor is there the by reading the
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* HDMI ID registers.
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*
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* Note that type 1 DVI adaptors are not required to implemnt
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* any registers, and that presents a problem for detection.
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* If the i2c transfer is nacked, we may or may not be dealing
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* with a type 1 DVI adaptor. Some other mechanism of detecting
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* the presence of the adaptor is required. One way would be
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* to check the state of the CONFIG1 pin, Another method would
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* simply require the driver to know whether the port is a DP++
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* port or a native HDMI port. Both of these methods are entirely
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* hardware/driver specific so we can't deal with them here.
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*/
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ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_HDMI_ID,
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hdmi_id, sizeof(hdmi_id));
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DRM_DEBUG_KMS("DP dual mode HDMI ID: %*pE (err %zd)\n",
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ret ? 0 : (int)sizeof(hdmi_id), hdmi_id, ret);
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if (ret)
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return DRM_DP_DUAL_MODE_UNKNOWN;
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/*
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* Sigh. Some (maybe all?) type 1 adaptors are broken and ack
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* the offset but ignore it, and instead they just always return
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* data from the start of the HDMI ID buffer. So for a broken
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* type 1 HDMI adaptor a single byte read will always give us
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* 0x44, and for a type 1 DVI adaptor it should give 0x00
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* (assuming it implements any registers). Fortunately neither
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* of those values will match the type 2 signature of the
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* DP_DUAL_MODE_ADAPTOR_ID register so we can proceed with
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* the type 2 adaptor detection safely even in the presence
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* of broken type 1 adaptors.
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*/
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ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_ADAPTOR_ID,
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&adaptor_id, sizeof(adaptor_id));
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DRM_DEBUG_KMS("DP dual mode adaptor ID: %02x (err %zd)\n",
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adaptor_id, ret);
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if (ret == 0) {
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if (is_lspcon_adaptor(hdmi_id, adaptor_id))
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return DRM_DP_DUAL_MODE_LSPCON;
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if (is_type2_adaptor(adaptor_id)) {
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if (is_hdmi_adaptor(hdmi_id))
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return DRM_DP_DUAL_MODE_TYPE2_HDMI;
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else
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return DRM_DP_DUAL_MODE_TYPE2_DVI;
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}
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/*
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* If neither a proper type 1 ID nor a broken type 1 adaptor
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* as described above, assume type 1, but let the user know
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* that we may have misdetected the type.
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*/
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if (!is_type1_adaptor(adaptor_id) && adaptor_id != hdmi_id[0])
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DRM_ERROR("Unexpected DP dual mode adaptor ID %02x\n",
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adaptor_id);
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}
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if (is_hdmi_adaptor(hdmi_id))
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return DRM_DP_DUAL_MODE_TYPE1_HDMI;
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else
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return DRM_DP_DUAL_MODE_TYPE1_DVI;
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}
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EXPORT_SYMBOL(drm_dp_dual_mode_detect);
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/**
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* drm_dp_dual_mode_max_tmds_clock - Max TMDS clock for DP dual mode adaptor
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* @type: DP dual mode adaptor type
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* @adapter: I2C adapter for the DDC bus
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*
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* Determine the max TMDS clock the adaptor supports based on the
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* type of the dual mode adaptor and the DP_DUAL_MODE_MAX_TMDS_CLOCK
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* register (on type2 adaptors). As some type 1 adaptors have
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* problems with registers (see comments in drm_dp_dual_mode_detect())
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* we don't read the register on those, instead we simply assume
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* a 165 MHz limit based on the specification.
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*
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* Returns:
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* Maximum supported TMDS clock rate for the DP dual mode adaptor in kHz.
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*/
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int drm_dp_dual_mode_max_tmds_clock(enum drm_dp_dual_mode_type type,
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struct i2c_adapter *adapter)
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{
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uint8_t max_tmds_clock;
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ssize_t ret;
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/* native HDMI so no limit */
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if (type == DRM_DP_DUAL_MODE_NONE)
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return 0;
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/*
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* Type 1 adaptors are limited to 165MHz
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* Type 2 adaptors can tells us their limit
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*/
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if (type < DRM_DP_DUAL_MODE_TYPE2_DVI)
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return 165000;
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ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_MAX_TMDS_CLOCK,
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&max_tmds_clock, sizeof(max_tmds_clock));
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if (ret || max_tmds_clock == 0x00 || max_tmds_clock == 0xff) {
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DRM_DEBUG_KMS("Failed to query max TMDS clock\n");
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return 165000;
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}
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return max_tmds_clock * 5000 / 2;
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}
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EXPORT_SYMBOL(drm_dp_dual_mode_max_tmds_clock);
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/**
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* drm_dp_dual_mode_get_tmds_output - Get the state of the TMDS output buffers in the DP dual mode adaptor
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* @type: DP dual mode adaptor type
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* @adapter: I2C adapter for the DDC bus
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* @enabled: current state of the TMDS output buffers
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*
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* Get the state of the TMDS output buffers in the adaptor. For
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* type2 adaptors this is queried from the DP_DUAL_MODE_TMDS_OEN
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* register. As some type 1 adaptors have problems with registers
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* (see comments in drm_dp_dual_mode_detect()) we don't read the
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* register on those, instead we simply assume that the buffers
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* are always enabled.
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*
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* Returns:
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* 0 on success, negative error code on failure
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*/
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int drm_dp_dual_mode_get_tmds_output(enum drm_dp_dual_mode_type type,
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struct i2c_adapter *adapter,
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bool *enabled)
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{
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uint8_t tmds_oen;
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ssize_t ret;
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if (type < DRM_DP_DUAL_MODE_TYPE2_DVI) {
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*enabled = true;
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return 0;
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}
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ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_TMDS_OEN,
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&tmds_oen, sizeof(tmds_oen));
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if (ret) {
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DRM_DEBUG_KMS("Failed to query state of TMDS output buffers\n");
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return ret;
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}
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*enabled = !(tmds_oen & DP_DUAL_MODE_TMDS_DISABLE);
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return 0;
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}
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EXPORT_SYMBOL(drm_dp_dual_mode_get_tmds_output);
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/**
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* drm_dp_dual_mode_set_tmds_output - Enable/disable TMDS output buffers in the DP dual mode adaptor
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* @type: DP dual mode adaptor type
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* @adapter: I2C adapter for the DDC bus
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* @enable: enable (as opposed to disable) the TMDS output buffers
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*
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* Set the state of the TMDS output buffers in the adaptor. For
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* type2 this is set via the DP_DUAL_MODE_TMDS_OEN register. As
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* some type 1 adaptors have problems with registers (see comments
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* in drm_dp_dual_mode_detect()) we avoid touching the register,
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* making this function a no-op on type 1 adaptors.
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*
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* Returns:
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* 0 on success, negative error code on failure
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*/
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int drm_dp_dual_mode_set_tmds_output(enum drm_dp_dual_mode_type type,
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struct i2c_adapter *adapter, bool enable)
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{
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uint8_t tmds_oen = enable ? 0 : DP_DUAL_MODE_TMDS_DISABLE;
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ssize_t ret;
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int retry;
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if (type < DRM_DP_DUAL_MODE_TYPE2_DVI)
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return 0;
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/*
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* LSPCON adapters in low-power state may ignore the first write, so
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* read back and verify the written value a few times.
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*/
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for (retry = 0; retry < 3; retry++) {
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uint8_t tmp;
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ret = drm_dp_dual_mode_write(adapter, DP_DUAL_MODE_TMDS_OEN,
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&tmds_oen, sizeof(tmds_oen));
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if (ret) {
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DRM_DEBUG_KMS("Failed to %s TMDS output buffers (%d attempts)\n",
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enable ? "enable" : "disable",
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retry + 1);
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return ret;
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}
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ret = drm_dp_dual_mode_read(adapter, DP_DUAL_MODE_TMDS_OEN,
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&tmp, sizeof(tmp));
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if (ret) {
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DRM_DEBUG_KMS("I2C read failed during TMDS output buffer %s (%d attempts)\n",
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enable ? "enabling" : "disabling",
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retry + 1);
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return ret;
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}
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if (tmp == tmds_oen)
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return 0;
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}
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DRM_DEBUG_KMS("I2C write value mismatch during TMDS output buffer %s\n",
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enable ? "enabling" : "disabling");
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return -EIO;
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}
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EXPORT_SYMBOL(drm_dp_dual_mode_set_tmds_output);
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/**
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* drm_dp_get_dual_mode_type_name - Get the name of the DP dual mode adaptor type as a string
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* @type: DP dual mode adaptor type
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*
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* Returns:
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* String representation of the DP dual mode adaptor type
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*/
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const char *drm_dp_get_dual_mode_type_name(enum drm_dp_dual_mode_type type)
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{
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switch (type) {
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case DRM_DP_DUAL_MODE_NONE:
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return "none";
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case DRM_DP_DUAL_MODE_TYPE1_DVI:
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return "type 1 DVI";
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case DRM_DP_DUAL_MODE_TYPE1_HDMI:
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return "type 1 HDMI";
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case DRM_DP_DUAL_MODE_TYPE2_DVI:
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return "type 2 DVI";
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case DRM_DP_DUAL_MODE_TYPE2_HDMI:
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return "type 2 HDMI";
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case DRM_DP_DUAL_MODE_LSPCON:
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return "lspcon";
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default:
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WARN_ON(type != DRM_DP_DUAL_MODE_UNKNOWN);
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return "unknown";
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}
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}
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EXPORT_SYMBOL(drm_dp_get_dual_mode_type_name);
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/**
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* drm_lspcon_get_mode: Get LSPCON's current mode of operation by
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* reading offset (0x80, 0x41)
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* @adapter: I2C-over-aux adapter
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* @mode: current lspcon mode of operation output variable
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*
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* Returns:
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* 0 on success, sets the current_mode value to appropriate mode
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* -error on failure
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*/
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int drm_lspcon_get_mode(struct i2c_adapter *adapter,
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enum drm_lspcon_mode *mode)
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{
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u8 data;
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int ret = 0;
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int retry;
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if (!mode) {
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DRM_ERROR("NULL input\n");
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return -EINVAL;
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}
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/* Read Status: i2c over aux */
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for (retry = 0; retry < 6; retry++) {
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if (retry)
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usleep_range(500, 1000);
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ret = drm_dp_dual_mode_read(adapter,
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DP_DUAL_MODE_LSPCON_CURRENT_MODE,
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&data, sizeof(data));
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if (!ret)
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break;
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}
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if (ret < 0) {
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DRM_DEBUG_KMS("LSPCON read(0x80, 0x41) failed\n");
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return -EFAULT;
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}
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if (data & DP_DUAL_MODE_LSPCON_MODE_PCON)
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*mode = DRM_LSPCON_MODE_PCON;
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else
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*mode = DRM_LSPCON_MODE_LS;
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return 0;
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}
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EXPORT_SYMBOL(drm_lspcon_get_mode);
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/**
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* drm_lspcon_set_mode: Change LSPCON's mode of operation by
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* writing offset (0x80, 0x40)
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* @adapter: I2C-over-aux adapter
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* @mode: required mode of operation
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*
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* Returns:
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|
* 0 on success, -error on failure/timeout
|
|
*/
|
|
int drm_lspcon_set_mode(struct i2c_adapter *adapter,
|
|
enum drm_lspcon_mode mode)
|
|
{
|
|
u8 data = 0;
|
|
int ret;
|
|
int time_out = 200;
|
|
enum drm_lspcon_mode current_mode;
|
|
|
|
if (mode == DRM_LSPCON_MODE_PCON)
|
|
data = DP_DUAL_MODE_LSPCON_MODE_PCON;
|
|
|
|
/* Change mode */
|
|
ret = drm_dp_dual_mode_write(adapter, DP_DUAL_MODE_LSPCON_MODE_CHANGE,
|
|
&data, sizeof(data));
|
|
if (ret < 0) {
|
|
DRM_ERROR("LSPCON mode change failed\n");
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Confirm mode change by reading the status bit.
|
|
* Sometimes, it takes a while to change the mode,
|
|
* so wait and retry until time out or done.
|
|
*/
|
|
do {
|
|
ret = drm_lspcon_get_mode(adapter, ¤t_mode);
|
|
if (ret) {
|
|
DRM_ERROR("can't confirm LSPCON mode change\n");
|
|
return ret;
|
|
} else {
|
|
if (current_mode != mode) {
|
|
msleep(10);
|
|
time_out -= 10;
|
|
} else {
|
|
DRM_DEBUG_KMS("LSPCON mode changed to %s\n",
|
|
mode == DRM_LSPCON_MODE_LS ?
|
|
"LS" : "PCON");
|
|
return 0;
|
|
}
|
|
}
|
|
} while (time_out);
|
|
|
|
DRM_ERROR("LSPCON mode change timed out\n");
|
|
return -ETIMEDOUT;
|
|
}
|
|
EXPORT_SYMBOL(drm_lspcon_set_mode);
|