diff mbox

[v5,26/36] drm/bridge: analogix_dp: Properly disable aux chan retries on rockchip

Message ID 20180309222327.18689-27-enric.balletbo@collabora.com (mailing list archive)
State New, archived
Headers show

Commit Message

Enric Balletbo i Serra March 9, 2018, 10:23 p.m. UTC
From: Douglas Anderson <dianders@chromium.org>

The comments in analogix_dp_init_aux() claim that we're disabling aux
channel retries, but then right below it for Rockchip it sets them to
3.  If we actually need 3 retries for Rockchip then we could adjust
the comment, but it seems more likely that we want the same retry
behavior across all platforms.

Cc: Stéphane Marchesin <marcheu@chromium.org>
Cc: 征增 王 <wzz@rock-chips.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
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>
---

 drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

Comments

Archit Taneja March 14, 2018, 6:53 a.m. UTC | #1
On Saturday 10 March 2018 03:53 AM, Enric Balletbo i Serra wrote:
> From: Douglas Anderson <dianders@chromium.org>
> 
> The comments in analogix_dp_init_aux() claim that we're disabling aux
> channel retries, but then right below it for Rockchip it sets them to
> 3.  If we actually need 3 retries for Rockchip then we could adjust
> the comment, but it seems more likely that we want the same retry
> behavior across all platforms.

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

Thanks,
Archit

> 
> Cc: Stéphane Marchesin <marcheu@chromium.org>
> Cc: 征增 王 <wzz@rock-chips.com>
> Signed-off-by: Douglas Anderson <dianders@chromium.org>
> 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>
> ---
> 
>   drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c | 15 ++++++++-------
>   1 file changed, 8 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> index 58e8a28e99aa..a5f2763d72e4 100644
> --- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> +++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
> @@ -481,15 +481,16 @@ void analogix_dp_init_aux(struct analogix_dp_device *dp)
>   
>   	analogix_dp_reset_aux(dp);
>   
> -	/* Disable AUX transaction H/W retry */
> +	/* AUX_BIT_PERIOD_EXPECTED_DELAY doesn't apply to Rockchip IP */
>   	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
> -		reg = AUX_BIT_PERIOD_EXPECTED_DELAY(0) |
> -		      AUX_HW_RETRY_COUNT_SEL(3) |
> -		      AUX_HW_RETRY_INTERVAL_600_MICROSECONDS;
> +		reg = 0;
>   	else
> -		reg = AUX_BIT_PERIOD_EXPECTED_DELAY(3) |
> -		      AUX_HW_RETRY_COUNT_SEL(0) |
> -		      AUX_HW_RETRY_INTERVAL_600_MICROSECONDS;
> +		reg = AUX_BIT_PERIOD_EXPECTED_DELAY(3);
> +
> +	/* Disable AUX transaction H/W retry */
> +	reg |= AUX_HW_RETRY_COUNT_SEL(0) |
> +	       AUX_HW_RETRY_INTERVAL_600_MICROSECONDS;
> +
>   	writel(reg, dp->reg_base + ANALOGIX_DP_AUX_HW_RETRY_CTL);
>   
>   	/* Receive AUX Channel DEFER commands equal to DEFFER_COUNT*64 */
> 
--
To unsubscribe from this list: send the line "unsubscribe linux-input" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
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 58e8a28e99aa..a5f2763d72e4 100644
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
@@ -481,15 +481,16 @@  void analogix_dp_init_aux(struct analogix_dp_device *dp)
 
 	analogix_dp_reset_aux(dp);
 
-	/* Disable AUX transaction H/W retry */
+	/* AUX_BIT_PERIOD_EXPECTED_DELAY doesn't apply to Rockchip IP */
 	if (dp->plat_data && is_rockchip(dp->plat_data->dev_type))
-		reg = AUX_BIT_PERIOD_EXPECTED_DELAY(0) |
-		      AUX_HW_RETRY_COUNT_SEL(3) |
-		      AUX_HW_RETRY_INTERVAL_600_MICROSECONDS;
+		reg = 0;
 	else
-		reg = AUX_BIT_PERIOD_EXPECTED_DELAY(3) |
-		      AUX_HW_RETRY_COUNT_SEL(0) |
-		      AUX_HW_RETRY_INTERVAL_600_MICROSECONDS;
+		reg = AUX_BIT_PERIOD_EXPECTED_DELAY(3);
+
+	/* Disable AUX transaction H/W retry */
+	reg |= AUX_HW_RETRY_COUNT_SEL(0) |
+	       AUX_HW_RETRY_INTERVAL_600_MICROSECONDS;
+
 	writel(reg, dp->reg_base + ANALOGIX_DP_AUX_HW_RETRY_CTL);
 
 	/* Receive AUX Channel DEFER commands equal to DEFFER_COUNT*64 */