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drm/stm: add sleep power management 

Implements system sleep power management ops.

Signed-off-by: Yannick Fertré <yannick.fertre@st.com>
Acked-by: Philippe Cornu <philippe.cornu@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1553156120-13851-1-git-send-email-yannick.fertre@st.com
This commit is contained in:
Yannick Fertré 2019-03-21 09:15:20 +01:00 committed by Benjamin Gaignard
parent 1861a1ffbc
commit df61c77665
3 changed files with 62 additions and 0 deletions
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35
drivers/gpu/drm/stm/drv.c
View File

@ -129,6 +129,40 @@ static void drv_unload(struct drm_device *ddev)
drm_mode_config_cleanup(ddev);
}
static __maybe_unused int drv_suspend(struct device *dev)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct ltdc_device *ldev = ddev->dev_private;
struct drm_atomic_state *state;
drm_kms_helper_poll_disable(ddev);
state = drm_atomic_helper_suspend(ddev);
if (IS_ERR(state)) {
drm_kms_helper_poll_enable(ddev);
return PTR_ERR(state);
}
ldev->suspend_state = state;
ltdc_suspend(ddev);
return 0;
}
static __maybe_unused int drv_resume(struct device *dev)
{
struct drm_device *ddev = dev_get_drvdata(dev);
struct ltdc_device *ldev = ddev->dev_private;
ltdc_resume(ddev);
drm_atomic_helper_resume(ddev, ldev->suspend_state);
drm_kms_helper_poll_enable(ddev);
return 0;
}
static const struct dev_pm_ops drv_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
};
static int stm_drm_platform_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
@ -186,6 +220,7 @@ static struct platform_driver stm_drm_platform_driver = {
.driver = {
.name = "stm32-display",
.of_match_table = drv_dt_ids,
.pm = &drv_pm_ops,
},
};

24
drivers/gpu/drm/stm/ltdc.c
View File

@ -1062,6 +1062,30 @@ static int ltdc_get_caps(struct drm_device *ddev)
return 0;
}
void ltdc_suspend(struct drm_device *ddev)
{
struct ltdc_device *ldev = ddev->dev_private;
DRM_DEBUG_DRIVER("\n");
clk_disable_unprepare(ldev->pixel_clk);
}
int ltdc_resume(struct drm_device *ddev)
{
struct ltdc_device *ldev = ddev->dev_private;
int ret;
DRM_DEBUG_DRIVER("\n");
ret = clk_prepare_enable(ldev->pixel_clk);
if (ret) {
DRM_ERROR("failed to enable pixel clock (%d)\n", ret);
return ret;
}
return 0;
}
int ltdc_load(struct drm_device *ddev)
{
struct platform_device *pdev = to_platform_device(ddev->dev);

3
drivers/gpu/drm/stm/ltdc.h
View File

@ -36,6 +36,7 @@ struct ltdc_device {
u32 error_status;
u32 irq_status;
struct fps_info plane_fpsi[LTDC_MAX_LAYER];
struct drm_atomic_state *suspend_state;
};
bool ltdc_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
@ -45,5 +46,7 @@ bool ltdc_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
int ltdc_load(struct drm_device *ddev);
void ltdc_unload(struct drm_device *ddev);
void ltdc_suspend(struct drm_device *ddev);
int ltdc_resume(struct drm_device *ddev);
#endif