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| author | Kuogee Hsieh <quic_khsieh@quicinc.com> | 2022-09-12 09:23:50 -0700 |
|---|---|---|
| committer | Dmitry Baryshkov <dmitry.baryshkov@linaro.org> | 2022-11-02 18:59:44 +0300 |
| commit | af309c0c0654f4580c44d1f6db1809e9a78d079e (patch) | |
| tree | c5905f750194faefd196bf037d814916de9797ad | |
| parent | d54c518a496f8cd6db857ec65c6c8bc68f87f16d (diff) | |
| download | linux-stable-af309c0c0654f4580c44d1f6db1809e9a78d079e.tar.gz linux-stable-af309c0c0654f4580c44d1f6db1809e9a78d079e.tar.bz2 linux-stable-af309c0c0654f4580c44d1f6db1809e9a78d079e.zip | |
drm/msm/dp: retry 3 times if set sink to D0 poweer state failed
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 v5:
-- split into two patches
Signed-off-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/502536/
Link: https://lore.kernel.org/r/1662999830-13916-4-git-send-email-quic_khsieh@quicinc.com
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
| -rw-r--r-- | drivers/gpu/drm/msm/dp/dp_link.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c index ef35fac333f7..f1f1d646539d 100644 --- a/drivers/gpu/drm/msm/dp/dp_link.c +++ b/drivers/gpu/drm/msm/dp/dp_link.c @@ -50,6 +50,7 @@ static int dp_aux_link_power_up(struct drm_dp_aux *aux, { u8 value; ssize_t len; + int i; if (link->revision < 0x11) return 0; @@ -61,11 +62,13 @@ static int dp_aux_link_power_up(struct drm_dp_aux *aux, value &= ~DP_SET_POWER_MASK; value |= DP_SET_POWER_D0; - len = drm_dp_dpcd_writeb(aux, DP_SET_POWER, value); - if (len < 0) - return len; - - 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; } |