linux-stable/drivers/gpu/drm/i915/intel_dsi.c
Shashank Sharma d2e08c0f34 drm/i915/bxt: DSI prepare changes for BXT
This patch modifies dsi_prepare() function to support the same
modeset prepare sequence for BXT also. Main changes are:
1. BXT port control register is different than VLV.
2. BXT modeset sequence needs vdisplay and hdisplay programmed
   for transcoder.
3. BXT can select PIPE for MIPI transcoders.
4. BXT needs to program register MIPI_INIT_COUNT for both the ports,
   even if only one is being used.

v2: Fixed Jani's review comments. Rectified the DSI Macros to get
    proper register offsets using _MIPI_PORT instead of _TRANSCODER

v3: Rebased on latest drm-nightly branch. Fixed Jani's review comments.

Signed-off-by: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
2015-09-23 10:10:50 +02:00

1193 lines
34 KiB
C

/*
* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Author: Jani Nikula <jani.nikula@intel.com>
*/
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
#include <drm/drm_edid.h>
#include <drm/i915_drm.h>
#include <drm/drm_panel.h>
#include <drm/drm_mipi_dsi.h>
#include <linux/slab.h>
#include <linux/gpio/consumer.h>
#include "i915_drv.h"
#include "intel_drv.h"
#include "intel_dsi.h"
static const struct {
u16 panel_id;
struct drm_panel * (*init)(struct intel_dsi *intel_dsi, u16 panel_id);
} intel_dsi_drivers[] = {
{
.panel_id = MIPI_DSI_GENERIC_PANEL_ID,
.init = vbt_panel_init,
},
};
static void wait_for_dsi_fifo_empty(struct intel_dsi *intel_dsi, enum port port)
{
struct drm_encoder *encoder = &intel_dsi->base.base;
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 mask;
mask = LP_CTRL_FIFO_EMPTY | HS_CTRL_FIFO_EMPTY |
LP_DATA_FIFO_EMPTY | HS_DATA_FIFO_EMPTY;
if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & mask) == mask, 100))
DRM_ERROR("DPI FIFOs are not empty\n");
}
static void write_data(struct drm_i915_private *dev_priv, u32 reg,
const u8 *data, u32 len)
{
u32 i, j;
for (i = 0; i < len; i += 4) {
u32 val = 0;
for (j = 0; j < min_t(u32, len - i, 4); j++)
val |= *data++ << 8 * j;
I915_WRITE(reg, val);
}
}
static void read_data(struct drm_i915_private *dev_priv, u32 reg,
u8 *data, u32 len)
{
u32 i, j;
for (i = 0; i < len; i += 4) {
u32 val = I915_READ(reg);
for (j = 0; j < min_t(u32, len - i, 4); j++)
*data++ = val >> 8 * j;
}
}
static ssize_t intel_dsi_host_transfer(struct mipi_dsi_host *host,
const struct mipi_dsi_msg *msg)
{
struct intel_dsi_host *intel_dsi_host = to_intel_dsi_host(host);
struct drm_device *dev = intel_dsi_host->intel_dsi->base.base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
enum port port = intel_dsi_host->port;
struct mipi_dsi_packet packet;
ssize_t ret;
const u8 *header, *data;
u32 data_reg, data_mask, ctrl_reg, ctrl_mask;
ret = mipi_dsi_create_packet(&packet, msg);
if (ret < 0)
return ret;
header = packet.header;
data = packet.payload;
if (msg->flags & MIPI_DSI_MSG_USE_LPM) {
data_reg = MIPI_LP_GEN_DATA(port);
data_mask = LP_DATA_FIFO_FULL;
ctrl_reg = MIPI_LP_GEN_CTRL(port);
ctrl_mask = LP_CTRL_FIFO_FULL;
} else {
data_reg = MIPI_HS_GEN_DATA(port);
data_mask = HS_DATA_FIFO_FULL;
ctrl_reg = MIPI_HS_GEN_CTRL(port);
ctrl_mask = HS_CTRL_FIFO_FULL;
}
/* note: this is never true for reads */
if (packet.payload_length) {
if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & data_mask) == 0, 50))
DRM_ERROR("Timeout waiting for HS/LP DATA FIFO !full\n");
write_data(dev_priv, data_reg, packet.payload,
packet.payload_length);
}
if (msg->rx_len) {
I915_WRITE(MIPI_INTR_STAT(port), GEN_READ_DATA_AVAIL);
}
if (wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) & ctrl_mask) == 0, 50)) {
DRM_ERROR("Timeout waiting for HS/LP CTRL FIFO !full\n");
}
I915_WRITE(ctrl_reg, header[2] << 16 | header[1] << 8 | header[0]);
/* ->rx_len is set only for reads */
if (msg->rx_len) {
data_mask = GEN_READ_DATA_AVAIL;
if (wait_for((I915_READ(MIPI_INTR_STAT(port)) & data_mask) == data_mask, 50))
DRM_ERROR("Timeout waiting for read data.\n");
read_data(dev_priv, data_reg, msg->rx_buf, msg->rx_len);
}
/* XXX: fix for reads and writes */
return 4 + packet.payload_length;
}
static int intel_dsi_host_attach(struct mipi_dsi_host *host,
struct mipi_dsi_device *dsi)
{
return 0;
}
static int intel_dsi_host_detach(struct mipi_dsi_host *host,
struct mipi_dsi_device *dsi)
{
return 0;
}
static const struct mipi_dsi_host_ops intel_dsi_host_ops = {
.attach = intel_dsi_host_attach,
.detach = intel_dsi_host_detach,
.transfer = intel_dsi_host_transfer,
};
static struct intel_dsi_host *intel_dsi_host_init(struct intel_dsi *intel_dsi,
enum port port)
{
struct intel_dsi_host *host;
struct mipi_dsi_device *device;
host = kzalloc(sizeof(*host), GFP_KERNEL);
if (!host)
return NULL;
host->base.ops = &intel_dsi_host_ops;
host->intel_dsi = intel_dsi;
host->port = port;
/*
* We should call mipi_dsi_host_register(&host->base) here, but we don't
* have a host->dev, and we don't have OF stuff either. So just use the
* dsi framework as a library and hope for the best. Create the dsi
* devices by ourselves here too. Need to be careful though, because we
* don't initialize any of the driver model devices here.
*/
device = kzalloc(sizeof(*device), GFP_KERNEL);
if (!device) {
kfree(host);
return NULL;
}
device->host = &host->base;
host->device = device;
return host;
}
/*
* send a video mode command
*
* XXX: commands with data in MIPI_DPI_DATA?
*/
static int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd, bool hs,
enum port port)
{
struct drm_encoder *encoder = &intel_dsi->base.base;
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
u32 mask;
/* XXX: pipe, hs */
if (hs)
cmd &= ~DPI_LP_MODE;
else
cmd |= DPI_LP_MODE;
/* clear bit */
I915_WRITE(MIPI_INTR_STAT(port), SPL_PKT_SENT_INTERRUPT);
/* XXX: old code skips write if control unchanged */
if (cmd == I915_READ(MIPI_DPI_CONTROL(port)))
DRM_ERROR("Same special packet %02x twice in a row.\n", cmd);
I915_WRITE(MIPI_DPI_CONTROL(port), cmd);
mask = SPL_PKT_SENT_INTERRUPT;
if (wait_for((I915_READ(MIPI_INTR_STAT(port)) & mask) == mask, 100))
DRM_ERROR("Video mode command 0x%08x send failed.\n", cmd);
return 0;
}
static void band_gap_reset(struct drm_i915_private *dev_priv)
{
mutex_lock(&dev_priv->sb_lock);
vlv_flisdsi_write(dev_priv, 0x08, 0x0001);
vlv_flisdsi_write(dev_priv, 0x0F, 0x0005);
vlv_flisdsi_write(dev_priv, 0x0F, 0x0025);
udelay(150);
vlv_flisdsi_write(dev_priv, 0x0F, 0x0000);
vlv_flisdsi_write(dev_priv, 0x08, 0x0000);
mutex_unlock(&dev_priv->sb_lock);
}
static inline bool is_vid_mode(struct intel_dsi *intel_dsi)
{
return intel_dsi->operation_mode == INTEL_DSI_VIDEO_MODE;
}
static inline bool is_cmd_mode(struct intel_dsi *intel_dsi)
{
return intel_dsi->operation_mode == INTEL_DSI_COMMAND_MODE;
}
static bool intel_dsi_compute_config(struct intel_encoder *encoder,
struct intel_crtc_state *config)
{
struct intel_dsi *intel_dsi = container_of(encoder, struct intel_dsi,
base);
struct intel_connector *intel_connector = intel_dsi->attached_connector;
struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
struct drm_display_mode *adjusted_mode = &config->base.adjusted_mode;
DRM_DEBUG_KMS("\n");
if (fixed_mode)
intel_fixed_panel_mode(fixed_mode, adjusted_mode);
/* DSI uses short packets for sync events, so clear mode flags for DSI */
adjusted_mode->flags = 0;
return true;
}
static void intel_dsi_port_enable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 temp;
if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK) {
temp = I915_READ(VLV_CHICKEN_3);
temp &= ~PIXEL_OVERLAP_CNT_MASK |
intel_dsi->pixel_overlap <<
PIXEL_OVERLAP_CNT_SHIFT;
I915_WRITE(VLV_CHICKEN_3, temp);
}
for_each_dsi_port(port, intel_dsi->ports) {
temp = I915_READ(MIPI_PORT_CTRL(port));
temp &= ~LANE_CONFIGURATION_MASK;
temp &= ~DUAL_LINK_MODE_MASK;
if (intel_dsi->ports == ((1 << PORT_A) | (1 << PORT_C))) {
temp |= (intel_dsi->dual_link - 1)
<< DUAL_LINK_MODE_SHIFT;
temp |= intel_crtc->pipe ?
LANE_CONFIGURATION_DUAL_LINK_B :
LANE_CONFIGURATION_DUAL_LINK_A;
}
/* assert ip_tg_enable signal */
I915_WRITE(MIPI_PORT_CTRL(port), temp | DPI_ENABLE);
POSTING_READ(MIPI_PORT_CTRL(port));
}
}
static void intel_dsi_port_disable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 temp;
for_each_dsi_port(port, intel_dsi->ports) {
/* de-assert ip_tg_enable signal */
temp = I915_READ(MIPI_PORT_CTRL(port));
I915_WRITE(MIPI_PORT_CTRL(port), temp & ~DPI_ENABLE);
POSTING_READ(MIPI_PORT_CTRL(port));
}
}
static void intel_dsi_device_ready(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 val;
DRM_DEBUG_KMS("\n");
mutex_lock(&dev_priv->sb_lock);
/* program rcomp for compliance, reduce from 50 ohms to 45 ohms
* needed everytime after power gate */
vlv_flisdsi_write(dev_priv, 0x04, 0x0004);
mutex_unlock(&dev_priv->sb_lock);
/* bandgap reset is needed after everytime we do power gate */
band_gap_reset(dev_priv);
for_each_dsi_port(port, intel_dsi->ports) {
I915_WRITE(MIPI_DEVICE_READY(port), ULPS_STATE_ENTER);
usleep_range(2500, 3000);
/* Enable MIPI PHY transparent latch
* Common bit for both MIPI Port A & MIPI Port C
* No similar bit in MIPI Port C reg
*/
val = I915_READ(MIPI_PORT_CTRL(PORT_A));
I915_WRITE(MIPI_PORT_CTRL(PORT_A), val | LP_OUTPUT_HOLD);
usleep_range(1000, 1500);
I915_WRITE(MIPI_DEVICE_READY(port), ULPS_STATE_EXIT);
usleep_range(2500, 3000);
I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY);
usleep_range(2500, 3000);
}
}
static void intel_dsi_enable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
DRM_DEBUG_KMS("\n");
if (is_cmd_mode(intel_dsi)) {
for_each_dsi_port(port, intel_dsi->ports)
I915_WRITE(MIPI_MAX_RETURN_PKT_SIZE(port), 8 * 4);
} else {
msleep(20); /* XXX */
for_each_dsi_port(port, intel_dsi->ports)
dpi_send_cmd(intel_dsi, TURN_ON, false, port);
msleep(100);
drm_panel_enable(intel_dsi->panel);
for_each_dsi_port(port, intel_dsi->ports)
wait_for_dsi_fifo_empty(intel_dsi, port);
intel_dsi_port_enable(encoder);
}
intel_panel_enable_backlight(intel_dsi->attached_connector);
}
static void intel_dsi_pre_enable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
enum pipe pipe = intel_crtc->pipe;
enum port port;
u32 tmp;
DRM_DEBUG_KMS("\n");
/* Panel Enable over CRC PMIC */
if (intel_dsi->gpio_panel)
gpiod_set_value_cansleep(intel_dsi->gpio_panel, 1);
msleep(intel_dsi->panel_on_delay);
/* Disable DPOunit clock gating, can stall pipe
* and we need DPLL REFA always enabled */
tmp = I915_READ(DPLL(pipe));
tmp |= DPLL_REF_CLK_ENABLE_VLV;
I915_WRITE(DPLL(pipe), tmp);
/* update the hw state for DPLL */
intel_crtc->config->dpll_hw_state.dpll = DPLL_INTEGRATED_REF_CLK_VLV |
DPLL_REF_CLK_ENABLE_VLV | DPLL_VGA_MODE_DIS;
tmp = I915_READ(DSPCLK_GATE_D);
tmp |= DPOUNIT_CLOCK_GATE_DISABLE;
I915_WRITE(DSPCLK_GATE_D, tmp);
/* put device in ready state */
intel_dsi_device_ready(encoder);
drm_panel_prepare(intel_dsi->panel);
for_each_dsi_port(port, intel_dsi->ports)
wait_for_dsi_fifo_empty(intel_dsi, port);
/* Enable port in pre-enable phase itself because as per hw team
* recommendation, port should be enabled befor plane & pipe */
intel_dsi_enable(encoder);
}
static void intel_dsi_enable_nop(struct intel_encoder *encoder)
{
DRM_DEBUG_KMS("\n");
/* for DSI port enable has to be done before pipe
* and plane enable, so port enable is done in
* pre_enable phase itself unlike other encoders
*/
}
static void intel_dsi_pre_disable(struct intel_encoder *encoder)
{
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
DRM_DEBUG_KMS("\n");
intel_panel_disable_backlight(intel_dsi->attached_connector);
if (is_vid_mode(intel_dsi)) {
/* Send Shutdown command to the panel in LP mode */
for_each_dsi_port(port, intel_dsi->ports)
dpi_send_cmd(intel_dsi, SHUTDOWN, false, port);
msleep(10);
}
}
static void intel_dsi_disable(struct intel_encoder *encoder)
{
struct drm_device *dev = encoder->base.dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 temp;
DRM_DEBUG_KMS("\n");
if (is_vid_mode(intel_dsi)) {
for_each_dsi_port(port, intel_dsi->ports)
wait_for_dsi_fifo_empty(intel_dsi, port);
intel_dsi_port_disable(encoder);
msleep(2);
}
for_each_dsi_port(port, intel_dsi->ports) {
/* Panel commands can be sent when clock is in LP11 */
I915_WRITE(MIPI_DEVICE_READY(port), 0x0);
temp = I915_READ(MIPI_CTRL(port));
temp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
I915_WRITE(MIPI_CTRL(port), temp |
intel_dsi->escape_clk_div <<
ESCAPE_CLOCK_DIVIDER_SHIFT);
I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
temp = I915_READ(MIPI_DSI_FUNC_PRG(port));
temp &= ~VID_MODE_FORMAT_MASK;
I915_WRITE(MIPI_DSI_FUNC_PRG(port), temp);
I915_WRITE(MIPI_DEVICE_READY(port), 0x1);
}
/* if disable packets are sent before sending shutdown packet then in
* some next enable sequence send turn on packet error is observed */
drm_panel_disable(intel_dsi->panel);
for_each_dsi_port(port, intel_dsi->ports)
wait_for_dsi_fifo_empty(intel_dsi, port);
}
static void intel_dsi_clear_device_ready(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
enum port port;
u32 val;
DRM_DEBUG_KMS("\n");
for_each_dsi_port(port, intel_dsi->ports) {
I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
ULPS_STATE_ENTER);
usleep_range(2000, 2500);
I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
ULPS_STATE_EXIT);
usleep_range(2000, 2500);
I915_WRITE(MIPI_DEVICE_READY(port), DEVICE_READY |
ULPS_STATE_ENTER);
usleep_range(2000, 2500);
/* Wait till Clock lanes are in LP-00 state for MIPI Port A
* only. MIPI Port C has no similar bit for checking
*/
if (wait_for(((I915_READ(MIPI_PORT_CTRL(PORT_A)) & AFE_LATCHOUT)
== 0x00000), 30))
DRM_ERROR("DSI LP not going Low\n");
/* Disable MIPI PHY transparent latch
* Common bit for both MIPI Port A & MIPI Port C
*/
val = I915_READ(MIPI_PORT_CTRL(PORT_A));
I915_WRITE(MIPI_PORT_CTRL(PORT_A), val & ~LP_OUTPUT_HOLD);
usleep_range(1000, 1500);
I915_WRITE(MIPI_DEVICE_READY(port), 0x00);
usleep_range(2000, 2500);
}
intel_disable_dsi_pll(encoder);
}
static void intel_dsi_post_disable(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
u32 val;
DRM_DEBUG_KMS("\n");
intel_dsi_disable(encoder);
intel_dsi_clear_device_ready(encoder);
val = I915_READ(DSPCLK_GATE_D);
val &= ~DPOUNIT_CLOCK_GATE_DISABLE;
I915_WRITE(DSPCLK_GATE_D, val);
drm_panel_unprepare(intel_dsi->panel);
msleep(intel_dsi->panel_off_delay);
msleep(intel_dsi->panel_pwr_cycle_delay);
/* Panel Disable over CRC PMIC */
if (intel_dsi->gpio_panel)
gpiod_set_value_cansleep(intel_dsi->gpio_panel, 0);
}
static bool intel_dsi_get_hw_state(struct intel_encoder *encoder,
enum pipe *pipe)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
struct drm_device *dev = encoder->base.dev;
enum intel_display_power_domain power_domain;
u32 dpi_enabled, func;
enum port port;
DRM_DEBUG_KMS("\n");
power_domain = intel_display_port_power_domain(encoder);
if (!intel_display_power_is_enabled(dev_priv, power_domain))
return false;
/* XXX: this only works for one DSI output */
for_each_dsi_port(port, intel_dsi->ports) {
func = I915_READ(MIPI_DSI_FUNC_PRG(port));
dpi_enabled = I915_READ(MIPI_PORT_CTRL(port)) &
DPI_ENABLE;
/* Due to some hardware limitations on BYT, MIPI Port C DPI
* Enable bit does not get set. To check whether DSI Port C
* was enabled in BIOS, check the Pipe B enable bit
*/
if (IS_VALLEYVIEW(dev) && !IS_CHERRYVIEW(dev) &&
(port == PORT_C))
dpi_enabled = I915_READ(PIPECONF(PIPE_B)) &
PIPECONF_ENABLE;
if (dpi_enabled || (func & CMD_MODE_DATA_WIDTH_MASK)) {
if (I915_READ(MIPI_DEVICE_READY(port)) & DEVICE_READY) {
*pipe = port == PORT_A ? PIPE_A : PIPE_B;
return true;
}
}
}
return false;
}
static void intel_dsi_get_config(struct intel_encoder *encoder,
struct intel_crtc_state *pipe_config)
{
u32 pclk;
DRM_DEBUG_KMS("\n");
/*
* DPLL_MD is not used in case of DSI, reading will get some default value
* set dpll_md = 0
*/
pipe_config->dpll_hw_state.dpll_md = 0;
pclk = vlv_get_dsi_pclk(encoder, pipe_config->pipe_bpp);
if (!pclk)
return;
pipe_config->base.adjusted_mode.crtc_clock = pclk;
pipe_config->port_clock = pclk;
}
static enum drm_mode_status
intel_dsi_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode;
int max_dotclk = to_i915(connector->dev)->max_dotclk_freq;
DRM_DEBUG_KMS("\n");
if (mode->flags & DRM_MODE_FLAG_DBLSCAN) {
DRM_DEBUG_KMS("MODE_NO_DBLESCAN\n");
return MODE_NO_DBLESCAN;
}
if (fixed_mode) {
if (mode->hdisplay > fixed_mode->hdisplay)
return MODE_PANEL;
if (mode->vdisplay > fixed_mode->vdisplay)
return MODE_PANEL;
if (fixed_mode->clock > max_dotclk)
return MODE_CLOCK_HIGH;
}
return MODE_OK;
}
/* return txclkesc cycles in terms of divider and duration in us */
static u16 txclkesc(u32 divider, unsigned int us)
{
switch (divider) {
case ESCAPE_CLOCK_DIVIDER_1:
default:
return 20 * us;
case ESCAPE_CLOCK_DIVIDER_2:
return 10 * us;
case ESCAPE_CLOCK_DIVIDER_4:
return 5 * us;
}
}
/* return pixels in terms of txbyteclkhs */
static u16 txbyteclkhs(u16 pixels, int bpp, int lane_count,
u16 burst_mode_ratio)
{
return DIV_ROUND_UP(DIV_ROUND_UP(pixels * bpp * burst_mode_ratio,
8 * 100), lane_count);
}
static void set_dsi_timings(struct drm_encoder *encoder,
const struct drm_display_mode *mode)
{
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
enum port port;
unsigned int bpp = intel_crtc->config->pipe_bpp;
unsigned int lane_count = intel_dsi->lane_count;
u16 hactive, hfp, hsync, hbp, vfp, vsync, vbp;
hactive = mode->hdisplay;
hfp = mode->hsync_start - mode->hdisplay;
hsync = mode->hsync_end - mode->hsync_start;
hbp = mode->htotal - mode->hsync_end;
if (intel_dsi->dual_link) {
hactive /= 2;
if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
hactive += intel_dsi->pixel_overlap;
hfp /= 2;
hsync /= 2;
hbp /= 2;
}
vfp = mode->vsync_start - mode->vdisplay;
vsync = mode->vsync_end - mode->vsync_start;
vbp = mode->vtotal - mode->vsync_end;
/* horizontal values are in terms of high speed byte clock */
hactive = txbyteclkhs(hactive, bpp, lane_count,
intel_dsi->burst_mode_ratio);
hfp = txbyteclkhs(hfp, bpp, lane_count, intel_dsi->burst_mode_ratio);
hsync = txbyteclkhs(hsync, bpp, lane_count,
intel_dsi->burst_mode_ratio);
hbp = txbyteclkhs(hbp, bpp, lane_count, intel_dsi->burst_mode_ratio);
for_each_dsi_port(port, intel_dsi->ports) {
if (IS_BROXTON(dev)) {
/*
* Program hdisplay and vdisplay on MIPI transcoder.
* This is different from calculated hactive and
* vactive, as they are calculated per channel basis,
* whereas these values should be based on resolution.
*/
I915_WRITE(BXT_MIPI_TRANS_HACTIVE(port),
mode->hdisplay);
I915_WRITE(BXT_MIPI_TRANS_VACTIVE(port),
mode->vdisplay);
I915_WRITE(BXT_MIPI_TRANS_VTOTAL(port),
mode->vtotal);
}
I915_WRITE(MIPI_HACTIVE_AREA_COUNT(port), hactive);
I915_WRITE(MIPI_HFP_COUNT(port), hfp);
/* meaningful for video mode non-burst sync pulse mode only,
* can be zero for non-burst sync events and burst modes */
I915_WRITE(MIPI_HSYNC_PADDING_COUNT(port), hsync);
I915_WRITE(MIPI_HBP_COUNT(port), hbp);
/* vertical values are in terms of lines */
I915_WRITE(MIPI_VFP_COUNT(port), vfp);
I915_WRITE(MIPI_VSYNC_PADDING_COUNT(port), vsync);
I915_WRITE(MIPI_VBP_COUNT(port), vbp);
}
}
static void intel_dsi_prepare(struct intel_encoder *intel_encoder)
{
struct drm_encoder *encoder = &intel_encoder->base;
struct drm_device *dev = encoder->dev;
struct drm_i915_private *dev_priv = dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->crtc);
struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
struct drm_display_mode *adjusted_mode =
&intel_crtc->config->base.adjusted_mode;
enum port port;
unsigned int bpp = intel_crtc->config->pipe_bpp;
u32 val, tmp;
u16 mode_hdisplay;
DRM_DEBUG_KMS("pipe %c\n", pipe_name(intel_crtc->pipe));
mode_hdisplay = adjusted_mode->hdisplay;
if (intel_dsi->dual_link) {
mode_hdisplay /= 2;
if (intel_dsi->dual_link == DSI_DUAL_LINK_FRONT_BACK)
mode_hdisplay += intel_dsi->pixel_overlap;
}
for_each_dsi_port(port, intel_dsi->ports) {
if (IS_VALLEYVIEW(dev)) {
/*
* escape clock divider, 20MHz, shared for A and C.
* device ready must be off when doing this! txclkesc?
*/
tmp = I915_READ(MIPI_CTRL(PORT_A));
tmp &= ~ESCAPE_CLOCK_DIVIDER_MASK;
I915_WRITE(MIPI_CTRL(PORT_A), tmp |
ESCAPE_CLOCK_DIVIDER_1);
/* read request priority is per pipe */
tmp = I915_READ(MIPI_CTRL(port));
tmp &= ~READ_REQUEST_PRIORITY_MASK;
I915_WRITE(MIPI_CTRL(port), tmp |
READ_REQUEST_PRIORITY_HIGH);
} else if (IS_BROXTON(dev)) {
/*
* FIXME:
* BXT can connect any PIPE to any MIPI port.
* Select the pipe based on the MIPI port read from
* VBT for now. Pick PIPE A for MIPI port A and C
* for port C.
*/
tmp = I915_READ(MIPI_CTRL(port));
tmp &= ~BXT_PIPE_SELECT_MASK;
if (port == PORT_A)
tmp |= BXT_PIPE_SELECT_A;
else if (port == PORT_C)
tmp |= BXT_PIPE_SELECT_C;
I915_WRITE(MIPI_CTRL(port), tmp);
}
/* XXX: why here, why like this? handling in irq handler?! */
I915_WRITE(MIPI_INTR_STAT(port), 0xffffffff);
I915_WRITE(MIPI_INTR_EN(port), 0xffffffff);
I915_WRITE(MIPI_DPHY_PARAM(port), intel_dsi->dphy_reg);
I915_WRITE(MIPI_DPI_RESOLUTION(port),
adjusted_mode->vdisplay << VERTICAL_ADDRESS_SHIFT |
mode_hdisplay << HORIZONTAL_ADDRESS_SHIFT);
}
set_dsi_timings(encoder, adjusted_mode);
val = intel_dsi->lane_count << DATA_LANES_PRG_REG_SHIFT;
if (is_cmd_mode(intel_dsi)) {
val |= intel_dsi->channel << CMD_MODE_CHANNEL_NUMBER_SHIFT;
val |= CMD_MODE_DATA_WIDTH_8_BIT; /* XXX */
} else {
val |= intel_dsi->channel << VID_MODE_CHANNEL_NUMBER_SHIFT;
/* XXX: cross-check bpp vs. pixel format? */
val |= intel_dsi->pixel_format;
}
tmp = 0;
if (intel_dsi->eotp_pkt == 0)
tmp |= EOT_DISABLE;
if (intel_dsi->clock_stop)
tmp |= CLOCKSTOP;
for_each_dsi_port(port, intel_dsi->ports) {
I915_WRITE(MIPI_DSI_FUNC_PRG(port), val);
/* timeouts for recovery. one frame IIUC. if counter expires,
* EOT and stop state. */
/*
* In burst mode, value greater than one DPI line Time in byte
* clock (txbyteclkhs) To timeout this timer 1+ of the above
* said value is recommended.
*
* In non-burst mode, Value greater than one DPI frame time in
* byte clock(txbyteclkhs) To timeout this timer 1+ of the above
* said value is recommended.
*
* In DBI only mode, value greater than one DBI frame time in
* byte clock(txbyteclkhs) To timeout this timer 1+ of the above
* said value is recommended.
*/
if (is_vid_mode(intel_dsi) &&
intel_dsi->video_mode_format == VIDEO_MODE_BURST) {
I915_WRITE(MIPI_HS_TX_TIMEOUT(port),
txbyteclkhs(adjusted_mode->htotal, bpp,
intel_dsi->lane_count,
intel_dsi->burst_mode_ratio) + 1);
} else {
I915_WRITE(MIPI_HS_TX_TIMEOUT(port),
txbyteclkhs(adjusted_mode->vtotal *
adjusted_mode->htotal,
bpp, intel_dsi->lane_count,
intel_dsi->burst_mode_ratio) + 1);
}
I915_WRITE(MIPI_LP_RX_TIMEOUT(port), intel_dsi->lp_rx_timeout);
I915_WRITE(MIPI_TURN_AROUND_TIMEOUT(port),
intel_dsi->turn_arnd_val);
I915_WRITE(MIPI_DEVICE_RESET_TIMER(port),
intel_dsi->rst_timer_val);
/* dphy stuff */
/* in terms of low power clock */
I915_WRITE(MIPI_INIT_COUNT(port),
txclkesc(intel_dsi->escape_clk_div, 100));
if (IS_BROXTON(dev) && (!intel_dsi->dual_link)) {
/*
* BXT spec says write MIPI_INIT_COUNT for
* both the ports, even if only one is
* getting used. So write the other port
* if not in dual link mode.
*/
I915_WRITE(MIPI_INIT_COUNT(port ==
PORT_A ? PORT_C : PORT_A),
intel_dsi->init_count);
}
/* recovery disables */
I915_WRITE(MIPI_EOT_DISABLE(port), tmp);
/* in terms of low power clock */
I915_WRITE(MIPI_INIT_COUNT(port), intel_dsi->init_count);
/* in terms of txbyteclkhs. actual high to low switch +
* MIPI_STOP_STATE_STALL * MIPI_LP_BYTECLK.
*
* XXX: write MIPI_STOP_STATE_STALL?
*/
I915_WRITE(MIPI_HIGH_LOW_SWITCH_COUNT(port),
intel_dsi->hs_to_lp_count);
/* XXX: low power clock equivalence in terms of byte clock.
* the number of byte clocks occupied in one low power clock.
* based on txbyteclkhs and txclkesc.
* txclkesc time / txbyteclk time * (105 + MIPI_STOP_STATE_STALL
* ) / 105.???
*/
I915_WRITE(MIPI_LP_BYTECLK(port), intel_dsi->lp_byte_clk);
/* the bw essential for transmitting 16 long packets containing
* 252 bytes meant for dcs write memory command is programmed in
* this register in terms of byte clocks. based on dsi transfer
* rate and the number of lanes configured the time taken to
* transmit 16 long packets in a dsi stream varies. */
I915_WRITE(MIPI_DBI_BW_CTRL(port), intel_dsi->bw_timer);
I915_WRITE(MIPI_CLK_LANE_SWITCH_TIME_CNT(port),
intel_dsi->clk_lp_to_hs_count << LP_HS_SSW_CNT_SHIFT |
intel_dsi->clk_hs_to_lp_count << HS_LP_PWR_SW_CNT_SHIFT);
if (is_vid_mode(intel_dsi))
/* Some panels might have resolution which is not a
* multiple of 64 like 1366 x 768. Enable RANDOM
* resolution support for such panels by default */
I915_WRITE(MIPI_VIDEO_MODE_FORMAT(port),
intel_dsi->video_frmt_cfg_bits |
intel_dsi->video_mode_format |
IP_TG_CONFIG |
RANDOM_DPI_DISPLAY_RESOLUTION);
}
}
static void intel_dsi_pre_pll_enable(struct intel_encoder *encoder)
{
DRM_DEBUG_KMS("\n");
intel_dsi_prepare(encoder);
intel_enable_dsi_pll(encoder);
}
static enum drm_connector_status
intel_dsi_detect(struct drm_connector *connector, bool force)
{
return connector_status_connected;
}
static int intel_dsi_get_modes(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
struct drm_display_mode *mode;
DRM_DEBUG_KMS("\n");
if (!intel_connector->panel.fixed_mode) {
DRM_DEBUG_KMS("no fixed mode\n");
return 0;
}
mode = drm_mode_duplicate(connector->dev,
intel_connector->panel.fixed_mode);
if (!mode) {
DRM_DEBUG_KMS("drm_mode_duplicate failed\n");
return 0;
}
drm_mode_probed_add(connector, mode);
return 1;
}
static void intel_dsi_connector_destroy(struct drm_connector *connector)
{
struct intel_connector *intel_connector = to_intel_connector(connector);
DRM_DEBUG_KMS("\n");
intel_panel_fini(&intel_connector->panel);
drm_connector_cleanup(connector);
kfree(connector);
}
static void intel_dsi_encoder_destroy(struct drm_encoder *encoder)
{
struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
if (intel_dsi->panel) {
drm_panel_detach(intel_dsi->panel);
/* XXX: Logically this call belongs in the panel driver. */
drm_panel_remove(intel_dsi->panel);
}
/* dispose of the gpios */
if (intel_dsi->gpio_panel)
gpiod_put(intel_dsi->gpio_panel);
intel_encoder_destroy(encoder);
}
static const struct drm_encoder_funcs intel_dsi_funcs = {
.destroy = intel_dsi_encoder_destroy,
};
static const struct drm_connector_helper_funcs intel_dsi_connector_helper_funcs = {
.get_modes = intel_dsi_get_modes,
.mode_valid = intel_dsi_mode_valid,
.best_encoder = intel_best_encoder,
};
static const struct drm_connector_funcs intel_dsi_connector_funcs = {
.dpms = drm_atomic_helper_connector_dpms,
.detect = intel_dsi_detect,
.destroy = intel_dsi_connector_destroy,
.fill_modes = drm_helper_probe_single_connector_modes,
.atomic_get_property = intel_connector_atomic_get_property,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
};
void intel_dsi_init(struct drm_device *dev)
{
struct intel_dsi *intel_dsi;
struct intel_encoder *intel_encoder;
struct drm_encoder *encoder;
struct intel_connector *intel_connector;
struct drm_connector *connector;
struct drm_display_mode *scan, *fixed_mode = NULL;
struct drm_i915_private *dev_priv = dev->dev_private;
enum port port;
unsigned int i;
DRM_DEBUG_KMS("\n");
/* There is no detection method for MIPI so rely on VBT */
if (!dev_priv->vbt.has_mipi)
return;
if (IS_VALLEYVIEW(dev)) {
dev_priv->mipi_mmio_base = VLV_MIPI_BASE;
} else {
DRM_ERROR("Unsupported Mipi device to reg base");
return;
}
intel_dsi = kzalloc(sizeof(*intel_dsi), GFP_KERNEL);
if (!intel_dsi)
return;
intel_connector = intel_connector_alloc();
if (!intel_connector) {
kfree(intel_dsi);
return;
}
intel_encoder = &intel_dsi->base;
encoder = &intel_encoder->base;
intel_dsi->attached_connector = intel_connector;
connector = &intel_connector->base;
drm_encoder_init(dev, encoder, &intel_dsi_funcs, DRM_MODE_ENCODER_DSI);
/* XXX: very likely not all of these are needed */
intel_encoder->compute_config = intel_dsi_compute_config;
intel_encoder->pre_pll_enable = intel_dsi_pre_pll_enable;
intel_encoder->pre_enable = intel_dsi_pre_enable;
intel_encoder->enable = intel_dsi_enable_nop;
intel_encoder->disable = intel_dsi_pre_disable;
intel_encoder->post_disable = intel_dsi_post_disable;
intel_encoder->get_hw_state = intel_dsi_get_hw_state;
intel_encoder->get_config = intel_dsi_get_config;
intel_connector->get_hw_state = intel_connector_get_hw_state;
intel_connector->unregister = intel_connector_unregister;
/* Pipe A maps to MIPI DSI port A, pipe B maps to MIPI DSI port C */
if (dev_priv->vbt.dsi.config->dual_link) {
/* XXX: does dual link work on either pipe? */
intel_encoder->crtc_mask = (1 << PIPE_A);
intel_dsi->ports = ((1 << PORT_A) | (1 << PORT_C));
} else if (dev_priv->vbt.dsi.port == DVO_PORT_MIPIA) {
intel_encoder->crtc_mask = (1 << PIPE_A);
intel_dsi->ports = (1 << PORT_A);
} else if (dev_priv->vbt.dsi.port == DVO_PORT_MIPIC) {
intel_encoder->crtc_mask = (1 << PIPE_B);
intel_dsi->ports = (1 << PORT_C);
}
/* Create a DSI host (and a device) for each port. */
for_each_dsi_port(port, intel_dsi->ports) {
struct intel_dsi_host *host;
host = intel_dsi_host_init(intel_dsi, port);
if (!host)
goto err;
intel_dsi->dsi_hosts[port] = host;
}
for (i = 0; i < ARRAY_SIZE(intel_dsi_drivers); i++) {
intel_dsi->panel = intel_dsi_drivers[i].init(intel_dsi,
intel_dsi_drivers[i].panel_id);
if (intel_dsi->panel)
break;
}
if (!intel_dsi->panel) {
DRM_DEBUG_KMS("no device found\n");
goto err;
}
/*
* In case of BYT with CRC PMIC, we need to use GPIO for
* Panel control.
*/
if (dev_priv->vbt.dsi.config->pwm_blc == PPS_BLC_PMIC) {
intel_dsi->gpio_panel =
gpiod_get(dev->dev, "panel", GPIOD_OUT_HIGH);
if (IS_ERR(intel_dsi->gpio_panel)) {
DRM_ERROR("Failed to own gpio for panel control\n");
intel_dsi->gpio_panel = NULL;
}
}
intel_encoder->type = INTEL_OUTPUT_DSI;
intel_encoder->cloneable = 0;
drm_connector_init(dev, connector, &intel_dsi_connector_funcs,
DRM_MODE_CONNECTOR_DSI);
drm_connector_helper_add(connector, &intel_dsi_connector_helper_funcs);
connector->display_info.subpixel_order = SubPixelHorizontalRGB; /*XXX*/
connector->interlace_allowed = false;
connector->doublescan_allowed = false;
intel_connector_attach_encoder(intel_connector, intel_encoder);
drm_connector_register(connector);
drm_panel_attach(intel_dsi->panel, connector);
mutex_lock(&dev->mode_config.mutex);
drm_panel_get_modes(intel_dsi->panel);
list_for_each_entry(scan, &connector->probed_modes, head) {
if ((scan->type & DRM_MODE_TYPE_PREFERRED)) {
fixed_mode = drm_mode_duplicate(dev, scan);
break;
}
}
mutex_unlock(&dev->mode_config.mutex);
if (!fixed_mode) {
DRM_DEBUG_KMS("no fixed mode\n");
goto err;
}
intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
intel_panel_setup_backlight(connector, INVALID_PIPE);
return;
err:
drm_encoder_cleanup(&intel_encoder->base);
kfree(intel_dsi);
kfree(intel_connector);
}