On Saturday 10 March 2018 03:52 AM, Enric Balletbo i Serra wrote:
From: Lin Huang <h...@rock-chips.com>

We should check AUX_EN bit to confirm the AUX CH operation is completed.


Reviewed-by: Archit Taneja <arch...@codeaurora.org>

Thanks,
Archit

Cc: St├ęphane Marchesin <marc...@chromium.org>
Signed-off-by: Lin Huang <h...@rock-chips.com>
Signed-off-by: zain wang <w...@rock-chips.com>
Signed-off-by: Sean Paul <seanp...@chromium.org>
Signed-off-by: Thierry Escande <thierry.esca...@collabora.com>
Signed-off-by: Enric Balletbo i Serra <enric.balle...@collabora.com>
Tested-by: Marek Szyprowski <m.szyprow...@samsung.com>
---

  drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 25 +++++++++++++----------
  1 file changed, 14 insertions(+), 11 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c 
b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
index 9df2f3ef000c..e78c861b9e06 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
@@ -1073,9 +1073,9 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device 
*dp,
  {
        u32 reg;
        u8 *buffer = msg->buffer;
-       int timeout_loop = 0;
        unsigned int i;
        int num_transferred = 0;
+       int ret;
/* Buffer size of AUX CH is 16 bytes */
        if (WARN_ON(msg->size > 16))
@@ -1139,17 +1139,20 @@ ssize_t analogix_dp_transfer(struct analogix_dp_device 
*dp,
writel(reg, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_2); - /* Is AUX CH command reply received? */
+       ret = readx_poll_timeout(readl, dp->reg_base + ANALOGIX_DP_AUX_CH_CTL_2,
+                                reg, !(reg & AUX_EN), 25, 500 * 1000);
+       if (ret) {
+               dev_err(dp->dev, "AUX CH enable timeout!\n");
+               return -ETIMEDOUT;
+       }
+
        /* TODO: Wait for an interrupt instead of looping? */
-       reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
-       while (!(reg & RPLY_RECEIV)) {
-               timeout_loop++;
-               if (timeout_loop > DP_TIMEOUT_LOOP_COUNT) {
-                       dev_err(dp->dev, "AUX CH command reply failed!\n");
-                       return -ETIMEDOUT;
-               }
-               reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
-               usleep_range(10, 11);
+       /* Is AUX CH command reply received? */
+       ret = readx_poll_timeout(readl, dp->reg_base + ANALOGIX_DP_INT_STA,
+                                reg, reg & RPLY_RECEIV, 10, 20 * 1000);
+       if (ret) {
+               dev_err(dp->dev, "AUX CH cmd reply timeout!\n");
+               return -ETIMEDOUT;
        }
/* Clear interrupt source for AUX CH command reply */

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