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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_drv.c
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@@ -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))