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disp: msm: dp: Reset dp sink power state during panel init

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Reset the dp sink power state during panel init.
Sinks may still be in old power states from
previous sessions, so reset the power to allow
for a clean start to the dp session.

CRs-Fixed: 2453351
Change-Id: I7e2a4c9bcdb8f69d2562ba098d80a1c7e8f9f620
Signed-off-by: Fuad Hossain <fhossain@codeaurora.org>
This commit is contained in:
Fuad Hossain
2019-05-14 18:16:24 -04:00
parent 91f4bcda9d
commit 8247a33d6b
1 changed files with 4 additions and 0 deletions
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4
msm/dp/dp_panel.c
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@@ -6,6 +6,7 @@
#define pr_fmt(fmt) "[drm-dp] %s: " fmt, __func__
#include "dp_panel.h"
#include <linux/unistd.h>
#include <drm/drm_fixed.h>
#define DP_KHZ_TO_HZ 1000
@@ -2459,6 +2460,9 @@ static int dp_panel_init_panel_info(struct dp_panel *dp_panel)
panel = container_of(dp_panel, struct dp_panel_private, dp_panel);
pinfo = &dp_panel->pinfo;
drm_dp_dpcd_writeb(panel->aux->drm_aux, DP_SET_POWER, DP_SET_POWER_D3);
/* 200us propagation time for the power down to take effect */
usleep_range(200, 205);
drm_dp_dpcd_writeb(panel->aux->drm_aux, DP_SET_POWER, DP_SET_POWER_D0);
/*