From: Kuogee Hsieh <quic_khsieh@quicinc.com>
To: <dri-devel@lists.freedesktop.org>, <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,
quic_abhinavk@quicinc.com, linux-kernel@vger.kernel.org,
Kuogee Hsieh <quic_khsieh@quicinc.com>,
freedreno@lists.freedesktop.org
Subject: [PATCH v4 2/2] drm/msm/dp: retry 3 times if set sink to D0 poweer state failed
Date: Thu, 8 Sep 2022 14:18:37 -0700 [thread overview]
Message-ID: <1662671917-17194-3-git-send-email-quic_khsieh@quicinc.com> (raw)
In-Reply-To: <1662671917-17194-1-git-send-email-quic_khsieh@quicinc.com>
Bring sink out of D3 (power down) mode into D0 (normal operation) mode
by setting DP_SET_POWER_D0 bit to DP_SET_POWER dpcd register. This
patch will retry 3 times if written to DP_SET_POWER register failed.
Changes in v4:
-- split into two patches
Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
---
drivers/gpu/drm/msm/dp/dp_link.c | 21 ++++++++++++---------
1 file changed, 12 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c
index 36f0af0..7b5ecf5 100644
--- a/drivers/gpu/drm/msm/dp/dp_link.c
+++ b/drivers/gpu/drm/msm/dp/dp_link.c
@@ -49,23 +49,26 @@ static int dp_aux_link_power_up(struct drm_dp_aux *aux,
struct dp_link_info *link)
{
u8 value;
- int err;
+ ssize_t len;
+ int i;
if (link->revision < 0x11)
return 0;
- err = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
- if (err < 0)
- return err;
+ len = drm_dp_dpcd_readb(aux, DP_SET_POWER, &value);
+ if (len < 0)
+ return len;
value &= ~DP_SET_POWER_MASK;
value |= DP_SET_POWER_D0;
- err = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
- if (err < 0)
- return err;
-
- usleep_range(1000, 2000);
+ /* retry for 1ms to give the sink time to wake up */
+ for (i = 0; i < 3; i++) {
+ len = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value);
+ usleep_range(1000, 2000);
+ if (len == 1)
+ break;
+ }
return 0;
}
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
next prev parent reply other threads:[~2022-09-08 21:19 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-09-08 21:18 [PATCH v4 0/2] cleared DP_DOWNSPREAD_CTRL register Kuogee Hsieh
2022-09-08 21:18 ` [PATCH v4 1/2] drm/msm/dp: cleared DP_DOWNSPREAD_CTRL register before start link training Kuogee Hsieh
2022-09-08 21:18 ` Kuogee Hsieh [this message]
2022-09-08 22:10 ` [PATCH v4 2/2] drm/msm/dp: retry 3 times if set sink to D0 poweer state failed Dmitry Baryshkov
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