diff mbox

[40/41] drm/bridge: analogix_dp: Properly log AUX CH errors

Message ID 20170310043305.17216-41-seanpaul@chromium.org (mailing list archive)
State New, archived
Headers show

Commit Message

Sean Paul March 10, 2017, 4:32 a.m. UTC 
From: Douglas Anderson <dianders@chromium.org>

The code in analogix_dp_transfer() that was supposed to print out:
  AUX CH error happened

Was actually dead code. That's because the previous check (whether
the interrupt status indicated any errors) would have hit for all
errors anyway.

Let's combine the two error checks so we can actually see AUX CH
errors.  We'll also downgrade the message to a warning since some of
these types of errors might be expected for some displays.  If this
gets too noisy we can downgrade again to debug.

Cc: 征增 王 <wzz@rock-chips.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
---
 drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

Comments

Andrzej Hajda March 22, 2017, 10:47 a.m. UTC | #1 
On 10.03.2017 05:32, Sean Paul wrote:
> From: Douglas Anderson <dianders@chromium.org>
>
> The code in analogix_dp_transfer() that was supposed to print out:
>   AUX CH error happened
>
> Was actually dead code. That's because the previous check (whether
> the interrupt status indicated any errors) would have hit for all
> errors anyway.
>
> Let's combine the two error checks so we can actually see AUX CH
> errors.  We'll also downgrade the message to a warning since some of
> these types of errors might be expected for some displays.  If this
> gets too noisy we can downgrade again to debug.
>
> Cc: 征增 王 <wzz@rock-chips.com>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> Signed-off-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
--
Regards
Andrzej
diff mbox

Patch

diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
index ddc8165947c1..29d130222636 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
@@ -1104,6 +1104,7 @@  ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
 			     struct drm_dp_aux_msg *msg)
 {
 	u32 reg;
+	u32 status_reg;
 	u8 *buffer = msg->buffer;
 	unsigned int i;
 	int num_transferred = 0;
@@ -1192,16 +1193,12 @@  ssize_t analogix_dp_transfer(struct analogix_dp_device *dp,
 
 	/* Clear interrupt source for AUX CH access error */
 	reg = readl(dp->reg_base + ANALOGIX_DP_INT_STA);
-	if (reg & AUX_ERR) {
+	status_reg = readl(dp->reg_base + ANALOGIX_DP_AUX_CH_STA);
+	if ((reg & AUX_ERR) || (status_reg & AUX_STATUS_MASK)) {
 		writel(AUX_ERR, dp->reg_base + ANALOGIX_DP_INT_STA);
-		goto aux_error;
-	}
 
-	/* Check AUX CH error access status */
-	reg = readl(dp->reg_base + ANALOGIX_DP_AUX_CH_STA);
-	if ((reg & AUX_STATUS_MASK)) {
-		dev_err(dp->dev, "AUX CH error happened: %d\n\n",
-			reg & AUX_STATUS_MASK);
+		dev_warn(dp->dev, "AUX CH error happened: %#x (%d)\n",
+			 status_reg & AUX_STATUS_MASK, !!(reg & AUX_ERR));
 		goto aux_error;
 	}