drm/bridge: analogix_dp: Check AUX_EN status when doing AUX transfer

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

Cc: Stéphane Marchesin <marcheu@chromium.org>
Signed-off-by: Lin Huang <hl@rock-chips.com>
Signed-off-by: zain wang <wzz@rock-chips.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180423105003.9004-3-enric.balletbo@collabora.com

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
index 9df2f3e..e78c861 100644 (file)
--- 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 */