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drm/tilcdc: disable the lcd controller/dma engine when suspend invoked

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The LCD controller must be deactivated and all DMA transactions stopped
when the suspend power state is entered otherwise the PRCM causes the L3
bus to get stuck in transition state.

This commit forces the lcdc to be shut down and waits for all pending DMA
transactions to complete as part of the suspend handler for this driver.

Signed-off-by: Darren Etheridge <detheridge@ti.com>
Tested-by: Dave Gerlach <d-gerlach@ti.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Darren Etheridge 2014-09-25 00:59:32 +00:00 committed by Jyri Sarha
parent b62222fcaa
commit 614b3cfeb8
3 changed files with 5 additions and 2 deletions
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3
drivers/gpu/drm/tilcdc/tilcdc_crtc.c
View file

@ -138,7 +138,6 @@ static void stop(struct drm_crtc *crtc)
tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
}
static void tilcdc_crtc_dpms(struct drm_crtc *crtc, int mode);
static void tilcdc_crtc_destroy(struct drm_crtc *crtc)
{
struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
@ -192,7 +191,7 @@ static int tilcdc_crtc_page_flip(struct drm_crtc *crtc,
return 0;
}
static void tilcdc_crtc_dpms(struct drm_crtc *crtc, int mode)
void tilcdc_crtc_dpms(struct drm_crtc *crtc, int mode)
{
struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
struct drm_device *dev = crtc->dev;

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

@ -592,6 +592,9 @@ static int tilcdc_pm_suspend(struct device *dev)
return 0;
}
/* Disable the LCDC controller, to avoid locking up the PRCM */
tilcdc_crtc_dpms(priv->crtc, DRM_MODE_DPMS_OFF);
/* Save register state: */
for (i = 0; i < ARRAY_SIZE(registers); i++)
if (registers[i].save && (priv->rev >= registers[i].rev))

1
drivers/gpu/drm/tilcdc/tilcdc_drv.h
View file

@ -171,5 +171,6 @@ void tilcdc_crtc_set_simulate_vesa_sync(struct drm_crtc *crtc,
bool simulate_vesa_sync);
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);
#endif /* __TILCDC_DRV_H__ */