[PATCH v2 09/12] drm/msm/dp: remove redundant checks related to ST_DISPLAY_OFF in plug handler

[Jessica Zhang]

From: Abhinav Kumar <quic_abhinavk at quicinc.com>

In commit 8ede2ecc3e5ee ("drm/msm/dp: Add DP compliance tests on Snapdragon
Chipsets"), checks were introduced to avoid handling any plug event in
ST_DISPLAY_OFF state.

Even if we do get hpd events, after the bridge was disabled,
it should get handled. Moreover, its unclear under what circumstances
these events will fire because ST_DISPLAY_OFF means that the link was
still connected but only the bridge was disabled. If the link was
untouched, then interrupts shouldn't fire.

Even in the case of the DP compliance equipment, it should be raising these
interrupts during the start of the test which is usually accompanied with
either a HPD pulse or a IRQ HPD but after the bridge is disabled it should
be fine to handle these anyway. In the absence of a better reason to keep
these checks, drop these and if any other issues do arise, it should be
handled in a different way.

Signed-off-by: Abhinav Kumar <quic_abhinavk at quicinc.com>
Signed-off-by: Jessica Zhang <jessica.zhang at oss.qualcomm.com>
---
Note: Taken from https://patchwork.freedesktop.org/series/142010/
---
 drivers/gpu/drm/msm/dp/dp_display.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index eabd6e6981fb..dd3fdeaacc91 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -495,9 +495,6 @@ static int msm_dp_hpd_plug_handle(struct msm_dp_display_private *dp, u32 data)
 	drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
 			dp->msm_dp_display.connector_type, state);
 
-	if (state == ST_DISPLAY_OFF)
-		return 0;
-
 	if (state == ST_MAINLINK_READY || state == ST_CONNECTED)
 		return 0;
 

-- 
2.50.1