drm/fsl-dcu: specify volatile registers

Since we are using cached registers, we need to specify volatile
registers explicitly to avoid reading their value from the cache.
This allows to read the correct interrupt status in fsl_dcu_drm_irq
and clear the asserted bits only.

Signed-off-by: Stefan Agner <stefan@agner.ch>

diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
index 9648b7f9a31cd759f7da4bb4e9ac26f990488bf4..b4e33e3e0250e0fa2b070890628d368987504ce4 100644 (file)
--- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
+++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.c
@@ -28,11 +28,21 @@
 #include "fsl_dcu_drm_crtc.h"
 #include "fsl_dcu_drm_drv.h"
 
+static bool fsl_dcu_drm_is_volatile_reg(struct device *dev, unsigned int reg)
+{
+       if (reg == DCU_INT_STATUS || reg == DCU_UPDATE_MODE)
+               return true;
+
+       return false;
+}
+
 static const struct regmap_config fsl_dcu_regmap_config = {
        .reg_bits = 32,
        .reg_stride = 4,
        .val_bits = 32,
        .cache_type = REGCACHE_RBTREE,
+
+       .volatile_reg = fsl_dcu_drm_is_volatile_reg,
 };
 
 static int fsl_dcu_drm_irq_init(struct drm_device *dev)
@@ -125,7 +135,7 @@ static irqreturn_t fsl_dcu_drm_irq(int irq, void *arg)
        if (int_status & DCU_INT_STATUS_VBLANK)
                drm_handle_vblank(dev, 0);
 
-       ret = regmap_write(fsl_dev->regmap, DCU_INT_STATUS, 0xffffffff);
+       ret = regmap_write(fsl_dev->regmap, DCU_INT_STATUS, int_status);
        if (ret)
                dev_err(dev->dev, "set DCU_INT_STATUS failed\n");
        ret = regmap_write(fsl_dev->regmap, DCU_UPDATE_MODE,