[media] s5p-mfc: check mfc bus ctrl before reset

during reset sequence, it is advisable to follow the below
sequence, in order to avoid unexpected behavior from MFC
. set SFR 0x7110 MFC_BUS_RESET_CTRL 0x1
  // wait for REQ_STATUS to be 1
. get SFR 0x7110 MFC_BUS_RESET_CTRL 0x3
  // reset now

Signed-off-by: Kiran AVND <avnd.kiran@samsung.com>
Signed-off-by: Arun Kumar K <arun.kk@samsung.com>
Signed-off-by: Kamil Debski <k.debski@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

2 files changed, 25 insertions, 1 deletions

diff --git a/drivers/media/platform/s5p-mfc/regs-mfc-v6.h b/drivers/media/platform/s5p-mfc/regs-mfc-v6.h
index 51cb2dd0e13a..83e01f3466e9 100644
--- a/drivers/media/platform/s5p-mfc/regs-mfc-v6.h
+++ b/drivers/media/platform/s5p-mfc/regs-mfc-v6.h
@@ -71,6 +71,7 @@
 #define S5P_FIMV_R2H_CMD_ENC_BUFFER_FUL_RET_V6  16
 #define S5P_FIMV_R2H_CMD_ERR_RET_V6             32
 
+#define S5P_FIMV_MFC_BUS_RESET_CTRL            0x7110
 #define S5P_FIMV_FW_VERSION_V6                  0xf000
 
 #define S5P_FIMV_INSTANCE_ID_V6                 0xf008
diff --git a/drivers/media/platform/s5p-mfc/s5p_mfc_ctrl.c b/drivers/media/platform/s5p-mfc/s5p_mfc_ctrl.c
index f5bb6b2b3a5f..0d3661b5eaf1 100644
--- a/drivers/media/platform/s5p-mfc/s5p_mfc_ctrl.c
+++ b/drivers/media/platform/s5p-mfc/s5p_mfc_ctrl.c
@@ -129,6 +129,25 @@ int s5p_mfc_release_firmware(struct s5p_mfc_dev *dev)
         return 0;
 }
 
+int s5p_mfc_bus_reset(struct s5p_mfc_dev *dev)
+{
+        unsigned int status;
+        unsigned long timeout;
+
+        /* Reset */
+        mfc_write(dev, 0x1, S5P_FIMV_MFC_BUS_RESET_CTRL);
+        timeout = jiffies + msecs_to_jiffies(MFC_BW_TIMEOUT);
+        /* Check bus status */
+        do {
+                if (time_after(jiffies, timeout)) {
+                        mfc_err("Timeout while resetting MFC.\n");
+                        return -EIO;
+                }
+                status = mfc_read(dev, S5P_FIMV_MFC_BUS_RESET_CTRL);
+        } while ((status & 0x2) == 0);
+        return 0;
+}
+
 /* Reset the device */
 int s5p_mfc_reset(struct s5p_mfc_dev *dev)
 {
@@ -147,11 +166,15 @@ int s5p_mfc_reset(struct s5p_mfc_dev *dev)
                 for (i = 0; i < S5P_FIMV_REG_CLEAR_COUNT_V6; i++)
                         mfc_write(dev, 0, S5P_FIMV_REG_CLEAR_BEGIN_V6 + (i*4));
 
+                /* check bus reset control before reset */
+                if (dev->risc_on)
+                        if (s5p_mfc_bus_reset(dev))
+                                return -EIO;
                 /* Reset
                  * set RISC_ON to 0 during power_on & wake_up.
                  * V6 needs RISC_ON set to 0 during reset also.
                  */
-                if ((!dev->risc_on) || (!IS_MFCV7(dev)))
+                if ((!dev->risc_on) || (!IS_MFCV7_PLUS(dev)))
                         mfc_write(dev, 0, S5P_FIMV_RISC_ON_V6);
 
                 mfc_write(dev, 0x1FFF, S5P_FIMV_MFC_RESET_V6);