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drm: atmel-hlcdc: reset layer A2Q and UPDATE bits when disabling it 

The A2Q (Add To Queue) and UPDATE bits are left in their previous state
when resetting the layer.
This lead to weird behavior when enabling the plane again: the framebuffer
previously queued is dequeued and we end up with access to an old memory
region.

Reset those bits when resetting the channel.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Boris Brezillon 2015-02-06 16:04:08 +01:00
parent 5b49afd60a
commit bd4248bb5e
1 changed files with 2 additions and 1 deletions
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3
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_layer.c
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@ -311,7 +311,8 @@ int atmel_hlcdc_layer_disable(struct atmel_hlcdc_layer *layer)
/* Disable the layer */
regmap_write(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_CHDR,
ATMEL_HLCDC_LAYER_RST);
ATMEL_HLCDC_LAYER_RST | ATMEL_HLCDC_LAYER_A2Q |
ATMEL_HLCDC_LAYER_UPDATE);
/* Clear all pending interrupts */
regmap_read(regmap, desc->regs_offset + ATMEL_HLCDC_LAYER_ISR, &isr);