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Commit 34a515d2 authored by Stefan Agner's avatar Stefan Agner
Browse files

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: default avatarStefan Agner <stefan@agner.ch>
parent 020a0bbc

drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c

+0 −4
Original line number Diff line number Diff line
@@ -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;

}