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![Markus Elfring](/assets/img/avatar_default.png)
The drm_fbdev_cma_restore_mode() function tests whether its argument is NULL and then returns immediately. Thus the test around the call is not needed. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
596 lines
15 KiB
C
596 lines
15 KiB
C
/*
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* Freescale i.MX drm driver
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*
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* Copyright (C) 2011 Sascha Hauer, Pengutronix
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/component.h>
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#include <linux/device.h>
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#include <linux/fb.h>
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#include <linux/module.h>
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#include <linux/of_graph.h>
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#include <linux/platform_device.h>
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#include <drm/drmP.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_fb_cma_helper.h>
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#include <drm/drm_plane_helper.h>
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#include <drm/drm_of.h>
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#include "imx-drm.h"
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#define MAX_CRTC 4
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struct imx_drm_component {
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struct device_node *of_node;
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struct list_head list;
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};
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struct imx_drm_device {
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struct drm_device *drm;
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struct imx_drm_crtc *crtc[MAX_CRTC];
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int pipes;
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struct drm_fbdev_cma *fbhelper;
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};
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struct imx_drm_crtc {
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struct drm_crtc *crtc;
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int pipe;
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struct imx_drm_crtc_helper_funcs imx_drm_helper_funcs;
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};
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static int legacyfb_depth = 16;
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module_param(legacyfb_depth, int, 0444);
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int imx_drm_crtc_id(struct imx_drm_crtc *crtc)
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{
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return crtc->pipe;
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}
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EXPORT_SYMBOL_GPL(imx_drm_crtc_id);
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static void imx_drm_driver_lastclose(struct drm_device *drm)
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{
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#if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
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struct imx_drm_device *imxdrm = drm->dev_private;
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drm_fbdev_cma_restore_mode(imxdrm->fbhelper);
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#endif
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}
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static int imx_drm_driver_unload(struct drm_device *drm)
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{
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#if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
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struct imx_drm_device *imxdrm = drm->dev_private;
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#endif
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drm_kms_helper_poll_fini(drm);
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#if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
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if (imxdrm->fbhelper)
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drm_fbdev_cma_fini(imxdrm->fbhelper);
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#endif
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component_unbind_all(drm->dev, drm);
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drm_vblank_cleanup(drm);
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drm_mode_config_cleanup(drm);
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platform_set_drvdata(drm->platformdev, NULL);
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return 0;
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}
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static struct imx_drm_crtc *imx_drm_find_crtc(struct drm_crtc *crtc)
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{
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struct imx_drm_device *imxdrm = crtc->dev->dev_private;
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unsigned i;
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for (i = 0; i < MAX_CRTC; i++)
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if (imxdrm->crtc[i] && imxdrm->crtc[i]->crtc == crtc)
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return imxdrm->crtc[i];
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return NULL;
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}
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int imx_drm_set_bus_format_pins(struct drm_encoder *encoder, u32 bus_format,
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int hsync_pin, int vsync_pin)
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{
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struct imx_drm_crtc_helper_funcs *helper;
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struct imx_drm_crtc *imx_crtc;
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imx_crtc = imx_drm_find_crtc(encoder->crtc);
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if (!imx_crtc)
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return -EINVAL;
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helper = &imx_crtc->imx_drm_helper_funcs;
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if (helper->set_interface_pix_fmt)
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return helper->set_interface_pix_fmt(encoder->crtc,
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bus_format, hsync_pin, vsync_pin);
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return 0;
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}
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EXPORT_SYMBOL_GPL(imx_drm_set_bus_format_pins);
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int imx_drm_set_bus_format(struct drm_encoder *encoder, u32 bus_format)
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{
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return imx_drm_set_bus_format_pins(encoder, bus_format, 2, 3);
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}
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EXPORT_SYMBOL_GPL(imx_drm_set_bus_format);
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int imx_drm_crtc_vblank_get(struct imx_drm_crtc *imx_drm_crtc)
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{
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return drm_vblank_get(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
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}
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EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_get);
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void imx_drm_crtc_vblank_put(struct imx_drm_crtc *imx_drm_crtc)
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{
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drm_vblank_put(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
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}
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EXPORT_SYMBOL_GPL(imx_drm_crtc_vblank_put);
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void imx_drm_handle_vblank(struct imx_drm_crtc *imx_drm_crtc)
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{
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drm_handle_vblank(imx_drm_crtc->crtc->dev, imx_drm_crtc->pipe);
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}
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EXPORT_SYMBOL_GPL(imx_drm_handle_vblank);
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static int imx_drm_enable_vblank(struct drm_device *drm, unsigned int pipe)
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{
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struct imx_drm_device *imxdrm = drm->dev_private;
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struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[pipe];
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int ret;
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if (!imx_drm_crtc)
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return -EINVAL;
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if (!imx_drm_crtc->imx_drm_helper_funcs.enable_vblank)
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return -ENOSYS;
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ret = imx_drm_crtc->imx_drm_helper_funcs.enable_vblank(
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imx_drm_crtc->crtc);
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return ret;
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}
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static void imx_drm_disable_vblank(struct drm_device *drm, unsigned int pipe)
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{
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struct imx_drm_device *imxdrm = drm->dev_private;
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struct imx_drm_crtc *imx_drm_crtc = imxdrm->crtc[pipe];
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if (!imx_drm_crtc)
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return;
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if (!imx_drm_crtc->imx_drm_helper_funcs.disable_vblank)
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return;
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imx_drm_crtc->imx_drm_helper_funcs.disable_vblank(imx_drm_crtc->crtc);
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}
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static void imx_drm_driver_preclose(struct drm_device *drm,
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struct drm_file *file)
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{
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int i;
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if (!file->is_master)
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return;
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for (i = 0; i < MAX_CRTC; i++)
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imx_drm_disable_vblank(drm, i);
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}
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static const struct file_operations imx_drm_driver_fops = {
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.owner = THIS_MODULE,
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.open = drm_open,
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.release = drm_release,
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.unlocked_ioctl = drm_ioctl,
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.mmap = drm_gem_cma_mmap,
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.poll = drm_poll,
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.read = drm_read,
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.llseek = noop_llseek,
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};
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void imx_drm_connector_destroy(struct drm_connector *connector)
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{
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drm_connector_unregister(connector);
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drm_connector_cleanup(connector);
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}
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EXPORT_SYMBOL_GPL(imx_drm_connector_destroy);
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void imx_drm_encoder_destroy(struct drm_encoder *encoder)
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{
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drm_encoder_cleanup(encoder);
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}
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EXPORT_SYMBOL_GPL(imx_drm_encoder_destroy);
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static void imx_drm_output_poll_changed(struct drm_device *drm)
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{
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#if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
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struct imx_drm_device *imxdrm = drm->dev_private;
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drm_fbdev_cma_hotplug_event(imxdrm->fbhelper);
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#endif
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}
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static struct drm_mode_config_funcs imx_drm_mode_config_funcs = {
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.fb_create = drm_fb_cma_create,
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.output_poll_changed = imx_drm_output_poll_changed,
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};
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/*
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* Main DRM initialisation. This binds, initialises and registers
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* with DRM the subcomponents of the driver.
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*/
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static int imx_drm_driver_load(struct drm_device *drm, unsigned long flags)
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{
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struct imx_drm_device *imxdrm;
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struct drm_connector *connector;
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int ret;
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imxdrm = devm_kzalloc(drm->dev, sizeof(*imxdrm), GFP_KERNEL);
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if (!imxdrm)
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return -ENOMEM;
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imxdrm->drm = drm;
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drm->dev_private = imxdrm;
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/*
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* enable drm irq mode.
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* - with irq_enabled = true, we can use the vblank feature.
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*
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* P.S. note that we wouldn't use drm irq handler but
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* just specific driver own one instead because
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* drm framework supports only one irq handler and
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* drivers can well take care of their interrupts
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*/
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drm->irq_enabled = true;
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/*
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* set max width and height as default value(4096x4096).
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* this value would be used to check framebuffer size limitation
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* at drm_mode_addfb().
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*/
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drm->mode_config.min_width = 64;
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drm->mode_config.min_height = 64;
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drm->mode_config.max_width = 4096;
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drm->mode_config.max_height = 4096;
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drm->mode_config.funcs = &imx_drm_mode_config_funcs;
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drm_mode_config_init(drm);
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ret = drm_vblank_init(drm, MAX_CRTC);
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if (ret)
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goto err_kms;
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/*
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* with vblank_disable_allowed = true, vblank interrupt will be
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* disabled by drm timer once a current process gives up ownership
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* of vblank event. (after drm_vblank_put function is called)
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*/
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drm->vblank_disable_allowed = true;
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platform_set_drvdata(drm->platformdev, drm);
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/* Now try and bind all our sub-components */
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ret = component_bind_all(drm->dev, drm);
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if (ret)
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goto err_vblank;
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/*
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* All components are now added, we can publish the connector sysfs
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* entries to userspace. This will generate hotplug events and so
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* userspace will expect to be able to access DRM at this point.
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*/
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list_for_each_entry(connector, &drm->mode_config.connector_list, head) {
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ret = drm_connector_register(connector);
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if (ret) {
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dev_err(drm->dev,
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"[CONNECTOR:%d:%s] drm_connector_register failed: %d\n",
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connector->base.id,
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connector->name, ret);
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goto err_unbind;
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}
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}
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/*
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* All components are now initialised, so setup the fb helper.
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* The fb helper takes copies of key hardware information, so the
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* crtcs/connectors/encoders must not change after this point.
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*/
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#if IS_ENABLED(CONFIG_DRM_IMX_FB_HELPER)
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if (legacyfb_depth != 16 && legacyfb_depth != 32) {
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dev_warn(drm->dev, "Invalid legacyfb_depth. Defaulting to 16bpp\n");
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legacyfb_depth = 16;
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}
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imxdrm->fbhelper = drm_fbdev_cma_init(drm, legacyfb_depth,
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drm->mode_config.num_crtc, MAX_CRTC);
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if (IS_ERR(imxdrm->fbhelper)) {
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ret = PTR_ERR(imxdrm->fbhelper);
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imxdrm->fbhelper = NULL;
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goto err_unbind;
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}
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#endif
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drm_kms_helper_poll_init(drm);
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return 0;
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err_unbind:
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component_unbind_all(drm->dev, drm);
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err_vblank:
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drm_vblank_cleanup(drm);
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err_kms:
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drm_mode_config_cleanup(drm);
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return ret;
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}
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/*
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* imx_drm_add_crtc - add a new crtc
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*/
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int imx_drm_add_crtc(struct drm_device *drm, struct drm_crtc *crtc,
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struct imx_drm_crtc **new_crtc, struct drm_plane *primary_plane,
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const struct imx_drm_crtc_helper_funcs *imx_drm_helper_funcs,
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struct device_node *port)
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{
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struct imx_drm_device *imxdrm = drm->dev_private;
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struct imx_drm_crtc *imx_drm_crtc;
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int ret;
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/*
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* The vblank arrays are dimensioned by MAX_CRTC - we can't
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* pass IDs greater than this to those functions.
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*/
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if (imxdrm->pipes >= MAX_CRTC)
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return -EINVAL;
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if (imxdrm->drm->open_count)
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return -EBUSY;
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imx_drm_crtc = kzalloc(sizeof(*imx_drm_crtc), GFP_KERNEL);
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if (!imx_drm_crtc)
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return -ENOMEM;
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imx_drm_crtc->imx_drm_helper_funcs = *imx_drm_helper_funcs;
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imx_drm_crtc->pipe = imxdrm->pipes++;
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imx_drm_crtc->crtc = crtc;
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crtc->port = port;
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imxdrm->crtc[imx_drm_crtc->pipe] = imx_drm_crtc;
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*new_crtc = imx_drm_crtc;
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ret = drm_mode_crtc_set_gamma_size(imx_drm_crtc->crtc, 256);
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if (ret)
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goto err_register;
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drm_crtc_helper_add(crtc,
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imx_drm_crtc->imx_drm_helper_funcs.crtc_helper_funcs);
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drm_crtc_init_with_planes(drm, crtc, primary_plane, NULL,
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imx_drm_crtc->imx_drm_helper_funcs.crtc_funcs);
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return 0;
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err_register:
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imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
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kfree(imx_drm_crtc);
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return ret;
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}
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EXPORT_SYMBOL_GPL(imx_drm_add_crtc);
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/*
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* imx_drm_remove_crtc - remove a crtc
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*/
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int imx_drm_remove_crtc(struct imx_drm_crtc *imx_drm_crtc)
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{
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struct imx_drm_device *imxdrm = imx_drm_crtc->crtc->dev->dev_private;
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drm_crtc_cleanup(imx_drm_crtc->crtc);
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imxdrm->crtc[imx_drm_crtc->pipe] = NULL;
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kfree(imx_drm_crtc);
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return 0;
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}
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EXPORT_SYMBOL_GPL(imx_drm_remove_crtc);
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int imx_drm_encoder_parse_of(struct drm_device *drm,
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struct drm_encoder *encoder, struct device_node *np)
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{
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uint32_t crtc_mask = drm_of_find_possible_crtcs(drm, np);
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/*
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* If we failed to find the CRTC(s) which this encoder is
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* supposed to be connected to, it's because the CRTC has
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* not been registered yet. Defer probing, and hope that
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* the required CRTC is added later.
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*/
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if (crtc_mask == 0)
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return -EPROBE_DEFER;
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encoder->possible_crtcs = crtc_mask;
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/* FIXME: this is the mask of outputs which can clone this output. */
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encoder->possible_clones = ~0;
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return 0;
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}
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EXPORT_SYMBOL_GPL(imx_drm_encoder_parse_of);
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/*
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* @node: device tree node containing encoder input ports
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* @encoder: drm_encoder
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*/
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int imx_drm_encoder_get_mux_id(struct device_node *node,
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struct drm_encoder *encoder)
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{
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struct imx_drm_crtc *imx_crtc = imx_drm_find_crtc(encoder->crtc);
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struct device_node *ep;
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struct of_endpoint endpoint;
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struct device_node *port;
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int ret;
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if (!node || !imx_crtc)
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return -EINVAL;
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for_each_endpoint_of_node(node, ep) {
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port = of_graph_get_remote_port(ep);
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of_node_put(port);
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if (port == imx_crtc->crtc->port) {
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ret = of_graph_parse_endpoint(ep, &endpoint);
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of_node_put(ep);
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return ret ? ret : endpoint.port;
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}
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(imx_drm_encoder_get_mux_id);
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static const struct drm_ioctl_desc imx_drm_ioctls[] = {
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/* none so far */
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};
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static struct drm_driver imx_drm_driver = {
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.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_PRIME,
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.load = imx_drm_driver_load,
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.unload = imx_drm_driver_unload,
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.lastclose = imx_drm_driver_lastclose,
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.preclose = imx_drm_driver_preclose,
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.set_busid = drm_platform_set_busid,
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.gem_free_object = drm_gem_cma_free_object,
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.gem_vm_ops = &drm_gem_cma_vm_ops,
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.dumb_create = drm_gem_cma_dumb_create,
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.dumb_map_offset = drm_gem_cma_dumb_map_offset,
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.dumb_destroy = drm_gem_dumb_destroy,
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.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
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.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
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.gem_prime_import = drm_gem_prime_import,
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.gem_prime_export = drm_gem_prime_export,
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.gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
|
|
.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
|
|
.gem_prime_vmap = drm_gem_cma_prime_vmap,
|
|
.gem_prime_vunmap = drm_gem_cma_prime_vunmap,
|
|
.gem_prime_mmap = drm_gem_cma_prime_mmap,
|
|
.get_vblank_counter = drm_vblank_no_hw_counter,
|
|
.enable_vblank = imx_drm_enable_vblank,
|
|
.disable_vblank = imx_drm_disable_vblank,
|
|
.ioctls = imx_drm_ioctls,
|
|
.num_ioctls = ARRAY_SIZE(imx_drm_ioctls),
|
|
.fops = &imx_drm_driver_fops,
|
|
.name = "imx-drm",
|
|
.desc = "i.MX DRM graphics",
|
|
.date = "20120507",
|
|
.major = 1,
|
|
.minor = 0,
|
|
.patchlevel = 0,
|
|
};
|
|
|
|
static int compare_of(struct device *dev, void *data)
|
|
{
|
|
struct device_node *np = data;
|
|
|
|
/* Special case for LDB, one device for two channels */
|
|
if (of_node_cmp(np->name, "lvds-channel") == 0) {
|
|
np = of_get_parent(np);
|
|
of_node_put(np);
|
|
}
|
|
|
|
return dev->of_node == np;
|
|
}
|
|
|
|
static int imx_drm_bind(struct device *dev)
|
|
{
|
|
return drm_platform_init(&imx_drm_driver, to_platform_device(dev));
|
|
}
|
|
|
|
static void imx_drm_unbind(struct device *dev)
|
|
{
|
|
drm_put_dev(dev_get_drvdata(dev));
|
|
}
|
|
|
|
static const struct component_master_ops imx_drm_ops = {
|
|
.bind = imx_drm_bind,
|
|
.unbind = imx_drm_unbind,
|
|
};
|
|
|
|
static int imx_drm_platform_probe(struct platform_device *pdev)
|
|
{
|
|
int ret = drm_of_component_probe(&pdev->dev, compare_of, &imx_drm_ops);
|
|
|
|
if (!ret)
|
|
ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int imx_drm_platform_remove(struct platform_device *pdev)
|
|
{
|
|
component_master_del(&pdev->dev, &imx_drm_ops);
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_PM_SLEEP
|
|
static int imx_drm_suspend(struct device *dev)
|
|
{
|
|
struct drm_device *drm_dev = dev_get_drvdata(dev);
|
|
|
|
/* The drm_dev is NULL before .load hook is called */
|
|
if (drm_dev == NULL)
|
|
return 0;
|
|
|
|
drm_kms_helper_poll_disable(drm_dev);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int imx_drm_resume(struct device *dev)
|
|
{
|
|
struct drm_device *drm_dev = dev_get_drvdata(dev);
|
|
|
|
if (drm_dev == NULL)
|
|
return 0;
|
|
|
|
drm_helper_resume_force_mode(drm_dev);
|
|
drm_kms_helper_poll_enable(drm_dev);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
|
|
|
|
static const struct of_device_id imx_drm_dt_ids[] = {
|
|
{ .compatible = "fsl,imx-display-subsystem", },
|
|
{ /* sentinel */ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, imx_drm_dt_ids);
|
|
|
|
static struct platform_driver imx_drm_pdrv = {
|
|
.probe = imx_drm_platform_probe,
|
|
.remove = imx_drm_platform_remove,
|
|
.driver = {
|
|
.name = "imx-drm",
|
|
.pm = &imx_drm_pm_ops,
|
|
.of_match_table = imx_drm_dt_ids,
|
|
},
|
|
};
|
|
module_platform_driver(imx_drm_pdrv);
|
|
|
|
MODULE_AUTHOR("Sascha Hauer <s.hauer@pengutronix.de>");
|
|
MODULE_DESCRIPTION("i.MX drm driver core");
|
|
MODULE_LICENSE("GPL");
|