[PATCH v4 14/34] media: camss: vfe: Do not disable CAMIF when clearing its status

[Todor Tomov]

Use "no change" value when clearing CAMIF status and make sure
this is done before configuring the new command.

Signed-off-by: Todor Tomov <todor.to...@linaro.org>
---
 drivers/media/platform/qcom/camss/camss-vfe.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/camss/camss-vfe.c 
b/drivers/media/platform/qcom/camss/camss-vfe.c
index 77167f1..15a1a01 100644
--- a/drivers/media/platform/qcom/camss/camss-vfe.c
+++ b/drivers/media/platform/qcom/camss/camss-vfe.c
@@ -156,6 +156,7 @@
 #define VFE_0_CAMIF_CMD                                0x2f4
 #define VFE_0_CAMIF_CMD_DISABLE_FRAME_BOUNDARY 0
 #define VFE_0_CAMIF_CMD_ENABLE_FRAME_BOUNDARY  1
+#define VFE_0_CAMIF_CMD_NO_CHANGE              3
 #define VFE_0_CAMIF_CMD_CLEAR_CAMIF_STATUS     (1 << 2)
 #define VFE_0_CAMIF_CFG                                0x2f8
 #define VFE_0_CAMIF_CFG_VFE_OUTPUT_EN          (1 << 6)
@@ -1021,8 +1022,10 @@ static void vfe_set_camif_cfg(struct vfe_device *vfe, 
struct vfe_line *line)
 
 static void vfe_set_camif_cmd(struct vfe_device *vfe, u32 cmd)
 {
-       writel_relaxed(VFE_0_CAMIF_CMD_CLEAR_CAMIF_STATUS,
+       writel_relaxed(VFE_0_CAMIF_CMD_CLEAR_CAMIF_STATUS |
+                      VFE_0_CAMIF_CMD_NO_CHANGE,
                       vfe->base + VFE_0_CAMIF_CMD);
+       wmb();
 
        writel_relaxed(cmd, vfe->base + VFE_0_CAMIF_CMD);
 }
-- 
2.7.4