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drm/bridge: analogix_dp: Properly disable aux chan retries on rockchip 

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>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180423105003.9004-21-enric.balletbo@collabora.com
This commit is contained in:
Douglas Anderson 2018-04-23 12:49:56 +02:00 committed by Andrzej Hajda
parent 71cef82434
commit 7bd0fd9850
1 changed files with 8 additions and 7 deletions
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15
drivers/gpu/drm/bridge/analogix/analogix_dp_reg.c
View File

@ -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 */