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drm/fsl-dcu: do not update when modifying irq registers 

The IRQ status and mask registers are not "double buffered" according
to the reference manual. Hence, there is no extra transfer/update
write needed when modifying these registers.

Signed-off-by: Stefan Agner <stefan@agner.ch>
This commit is contained in:
Stefan Agner 2016-01-04 16:34:22 -08:00
parent 020a0bbc0d
commit 34a515d27c
1 changed files with 0 additions and 4 deletions
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4
drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
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@ -59,8 +59,6 @@ static int fsl_dcu_drm_irq_init(struct drm_device *dev)
regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0);
regmap_write(fsl_dev->regmap, DCU_INT_MASK, ~0);
regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
DCU_UPDATE_MODE_READREG);
return ret;
}
@ -139,8 +137,6 @@ static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
drm_handle_vblank(dev, 0);
regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,
DCU_UPDATE_MODE_READREG);
return IRQ_HANDLED;
}