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drm/tilcdc: Restore old dpms state in pm_resume()

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Restore old dpms state in pm_resume(). The dpms is turned off in
pm_suspend() and it should be restored to its original state in
pm_resume(). Without this patch the display is left blanked after a
suspend/resume cycle.

Fixes commit 614b3cfeb8 ("drm/tilcdc: disable the lcd controller/dma
engine when suspend invoked")

Signed-off-by: Jyri Sarha <jsarha@ti.com>
This commit is contained in:
Jyri Sarha 2016-06-14 11:43:30 +03:00
parent 5c6c201ccb
commit 8fe5616b20
3 changed files with 12 additions and 0 deletions
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7
drivers/gpu/drm/tilcdc/tilcdc_crtc.c
View file

@ -246,6 +246,13 @@ void tilcdc_crtc_dpms(struct drm_crtc *crtc, int mode)
}
}
int tilcdc_crtc_current_dpms_state(struct drm_crtc *crtc)
{
struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
return tilcdc_crtc->dpms;
}
static bool tilcdc_crtc_mode_fixup(struct drm_crtc *crtc,
const struct drm_display_mode *mode,
struct drm_display_mode *adjusted_mode)

3
drivers/gpu/drm/tilcdc/tilcdc_drv.c
View file

@ -597,6 +597,7 @@ static int tilcdc_pm_suspend(struct device *dev)
}
/* Disable the LCDC controller, to avoid locking up the PRCM */
priv->saved_dpms_state = tilcdc_crtc_current_dpms_state(priv->crtc);
tilcdc_crtc_dpms(priv->crtc, DRM_MODE_DPMS_OFF);
/* Save register state: */
@ -627,6 +628,8 @@ static int tilcdc_pm_resume(struct device *dev)
priv->saved_register[n++]);
}
tilcdc_crtc_dpms(priv->crtc, priv->saved_dpms_state);
drm_kms_helper_poll_enable(ddev);
return 0;

2
drivers/gpu/drm/tilcdc/tilcdc_drv.h
View file

@ -67,6 +67,7 @@ struct tilcdc_drm_private {
/* register contents saved across suspend/resume: */
u32 *saved_register;
int saved_dpms_state;
bool ctx_valid;
#ifdef CONFIG_CPU_FREQ
@ -172,5 +173,6 @@ void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
int tilcdc_crtc_mode_valid(struct drm_crtc *crtc, struct drm_display_mode *mode);
int tilcdc_crtc_max_width(struct drm_crtc *crtc);
void tilcdc_crtc_dpms(struct drm_crtc *crtc, int mode);
int tilcdc_crtc_current_dpms_state(struct drm_crtc *crtc);
#endif /* __TILCDC_DRV_H__ */