From: Kuogee Hsieh <quic_khsieh@quicinc.com> To: <robdclark@gmail.com>, <sean@poorly.run>, <swboyd@chromium.org>, <dianders@chromium.org>, <vkoul@kernel.org>, <daniel@ffwll.ch>, <airlied@linux.ie>, <agross@kernel.org>, <dmitry.baryshkov@linaro.org>, <bjorn.andersson@linaro.org> Cc: <quic_aravindh@quicinc.com>, <quic_khsieh@quicinc.com>, <quic_sbillaka@quicinc.com>, <freedreno@lists.freedesktop.org>, <dri-devel@lists.freedesktop.org>, <linux-arm-msm@vger.kernel.org>, <linux-kernel@vger.kernel.org> Subject: [PATCH v5] drm/msm/dp: delete DP_RECOVERED_CLOCK_OUT_EN to fix tps4 Date: Thu, 11 Aug 2022 15:57:50 -0700 [thread overview] Message-ID: <1660258670-4200-1-git-send-email-quic_khsieh@quicinc.com> (raw) Data Symbols scrambled is required for tps4 at link training 2. Therefore SCRAMBLING_DISABLE bit should not be set for tps4 to work. RECOVERED_CLOCK_OUT_EN is for enable simple EYE test for jitter measurement with minimal equipment for embedded applications purpose and is not required to be set during normal operation. Current implementation always have RECOVERED_CLOCK_OUT_EN bit set which cause SCRAMBLING_DISABLE bit wrongly set at tps4 which prevent tps4 from working. This patch delete setting RECOVERED_CLOCK_OUT_EN to fix SCRAMBLING_DISABLE be wrongly set at tps4. Changes in v2: -- fix Fixes tag Changes in v3: -- revise commit text Changes in v4: -- fix commit text newline Changes in v5: -- fix commit text line over 75 chars Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index ab6aa13..013ca02 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1214,7 +1214,7 @@ static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl, if (ret) return ret; - dp_ctrl_train_pattern_set(ctrl, pattern | DP_RECOVERED_CLOCK_OUT_EN); + dp_ctrl_train_pattern_set(ctrl, pattern); for (tries = 0; tries <= maximum_retries; tries++) { drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
WARNING: multiple messages have this Message-ID (diff)
From: Kuogee Hsieh <quic_khsieh@quicinc.com> To: <robdclark@gmail.com>, <sean@poorly.run>, <swboyd@chromium.org>, <dianders@chromium.org>, <vkoul@kernel.org>, <daniel@ffwll.ch>, <airlied@linux.ie>, <agross@kernel.org>, <dmitry.baryshkov@linaro.org>, <bjorn.andersson@linaro.org> Cc: quic_sbillaka@quicinc.com, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, quic_khsieh@quicinc.com, quic_aravindh@quicinc.com, freedreno@lists.freedesktop.org Subject: [PATCH v5] drm/msm/dp: delete DP_RECOVERED_CLOCK_OUT_EN to fix tps4 Date: Thu, 11 Aug 2022 15:57:50 -0700 [thread overview] Message-ID: <1660258670-4200-1-git-send-email-quic_khsieh@quicinc.com> (raw) Data Symbols scrambled is required for tps4 at link training 2. Therefore SCRAMBLING_DISABLE bit should not be set for tps4 to work. RECOVERED_CLOCK_OUT_EN is for enable simple EYE test for jitter measurement with minimal equipment for embedded applications purpose and is not required to be set during normal operation. Current implementation always have RECOVERED_CLOCK_OUT_EN bit set which cause SCRAMBLING_DISABLE bit wrongly set at tps4 which prevent tps4 from working. This patch delete setting RECOVERED_CLOCK_OUT_EN to fix SCRAMBLING_DISABLE be wrongly set at tps4. Changes in v2: -- fix Fixes tag Changes in v3: -- revise commit text Changes in v4: -- fix commit text newline Changes in v5: -- fix commit text line over 75 chars Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com> Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com> Reviewed-by: Stephen Boyd <swboyd@chromium.org> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> --- drivers/gpu/drm/msm/dp/dp_ctrl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c index ab6aa13..013ca02 100644 --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c @@ -1214,7 +1214,7 @@ static int dp_ctrl_link_train_2(struct dp_ctrl_private *ctrl, if (ret) return ret; - dp_ctrl_train_pattern_set(ctrl, pattern | DP_RECOVERED_CLOCK_OUT_EN); + dp_ctrl_train_pattern_set(ctrl, pattern); for (tries = 0; tries <= maximum_retries; tries++) { drm_dp_link_train_channel_eq_delay(ctrl->aux, ctrl->panel->dpcd); -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project
next reply other threads:[~2022-08-11 22:58 UTC|newest] Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top 2022-08-11 22:57 Kuogee Hsieh [this message] 2022-08-11 22:57 ` [PATCH v5] drm/msm/dp: delete DP_RECOVERED_CLOCK_OUT_EN to fix tps4 Kuogee Hsieh
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