OMAPDSS: DSI: flush posted write when entering ULPS

Flush posted write between writing the ULPS enable bits and waiting for
the interrupt.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c
index 5abf8e7e7456..1331f92f11c2 100644
--- a/drivers/video/omap2/dss/dsi.c
+++ b/drivers/video/omap2/dss/dsi.c
@@ -3561,6 +3561,9 @@ static int dsi_enter_ulps(struct platform_device *dsidev)
         REG_FLD_MOD(dsidev, DSI_COMPLEXIO_CFG2, (1 << 0) | (1 << 1) | (1 << 2),
                 7, 5);
 
+        /* flush posted write and wait for SCP interface to finish the write */
+        dsi_read_reg(dsidev, DSI_COMPLEXIO_CFG2);
+
         if (wait_for_completion_timeout(&completion,
                                 msecs_to_jiffies(1000)) == 0) {
                 DSSERR("ULPS enable timeout\n");
@@ -3575,6 +3578,9 @@ static int dsi_enter_ulps(struct platform_device *dsidev)
         REG_FLD_MOD(dsidev, DSI_COMPLEXIO_CFG2, (0 << 0) | (0 << 1) | (0 << 2),
                 7, 5);
 
+        /* flush posted write and wait for SCP interface to finish the write */
+        dsi_read_reg(dsidev, DSI_COMPLEXIO_CFG2);
+
         dsi_cio_power(dsidev, DSI_COMPLEXIO_POWER_ULPS);
 
         dsi_if_enable(dsidev, false);