From: zain wang <wzz@rock-chips.com>
Date: Mon, 23 Apr 2018 12:49:39 +0200
Subject: drm/bridge: analogix_dp: Don't use fast link training when panel just
powered up
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Git-commit: 7ba8fb5704e958b94b6f0260f20afca58b35a55a
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
Panel would reset its setting when it powers down. It would forget the last
succeeded link training setting. So we can't use the last successful link
training setting to do fast link training. Let's reset fast_train_enable in
analogix_dp_bridge_disable();
Cc: Stéphane Marchesin <marcheu@chromium.org>
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/20180423105003.9004-4-enric.balletbo@collabora.com
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/bridge/analogix/analogix_dp_core.c | 9 +++++----
drivers/gpu/drm/bridge/analogix/analogix_dp_core.h | 2 +-
2 files changed, 6 insertions(+), 5 deletions(-)
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.c
@@ -579,14 +579,14 @@ static int analogix_dp_process_equalizer
if (retval != 1) {
dev_err(dp->dev, "failed to read downspread %d\n",
retval);
- dp->fast_train_support = false;
+ dp->fast_train_enable = false;
} else {
- dp->fast_train_support =
+ dp->fast_train_enable =
(spread & DP_NO_AUX_HANDSHAKE_LINK_TRAINING) ?
true : false;
}
dev_dbg(dp->dev, "fast link training %s\n",
- dp->fast_train_support ? "supported" : "unsupported");
+ dp->fast_train_enable ? "supported" : "unsupported");
/* set enhanced mode if available */
analogix_dp_set_enhanced_mode(dp);
@@ -793,7 +793,7 @@ static int analogix_dp_fast_link_train(s
static int analogix_dp_train_link(struct analogix_dp_device *dp)
{
- if (dp->fast_train_support)
+ if (dp->fast_train_enable)
return analogix_dp_fast_link_train(dp);
return analogix_dp_full_link_train(dp, dp->video_info.max_lane_count,
@@ -1197,6 +1197,7 @@ static void analogix_dp_bridge_disable(s
DRM_ERROR("failed to setup the panel ret = %d\n", ret);
dp->psr_enable = false;
+ dp->fast_train_enable = false;
dp->dpms_mode = DRM_MODE_DPMS_OFF;
}
--- a/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
+++ b/drivers/gpu/drm/bridge/analogix/analogix_dp_core.h
@@ -173,7 +173,7 @@ struct analogix_dp_device {
int hpd_gpio;
bool force_hpd;
bool psr_enable;
- bool fast_train_support;
+ bool fast_train_enable;
struct mutex panel_lock;
bool panel_is_modeset;