drm/fsl-dcu: specify volatile registers

[cascardo/linux.git] / drivers / gpu / drm / fsl-dcu / fsl_dcu_drm_drv.c

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 9648b7f..b4e33e3 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,