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drm/msm/dp: retry 3 times if set sink to D0 poweer state failed

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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>
This commit is contained in:
Kuogee Hsieh 2022-09-12 09:23:50 -07:00 committed by Dmitry Baryshkov
parent d54c518a49
commit af309c0c06
1 changed files with 8 additions and 5 deletions
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13
drivers/gpu/drm/msm/dp/dp_link.c
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@ -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;
}