linux-kernel - [PATCH 1/1] drm/panel: truly: Add additional delay after pulling down reset gpio

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Message-Id: <20190527102616.28315-1-vivek.gautam@codeaurora.org>
Date:   Mon, 27 May 2019 15:56:16 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     airlied@...ux.ie, thierry.reding@...il.com, daniel@...ll.ch,
        dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, robdclark@...il.com,
        linux-arm-msm@...r.kernel.org, bjorn.andersson@...aro.org,
        Vivek Gautam <vivek.gautam@...eaurora.org>
Subject: [PATCH 1/1] drm/panel: truly: Add additional delay after pulling down reset gpio

MTP SDM845 panel seems to need additional delay to bring panel
to a workable state. Running modetest without this change displays
blurry artifacts.

Signed-off-by: Vivek Gautam <vivek.gautam@...eaurora.org>
---
 drivers/gpu/drm/panel/panel-truly-nt35597.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
index fc2a66c53db4..aa7153fd3be4 100644
--- a/drivers/gpu/drm/panel/panel-truly-nt35597.c
+++ b/drivers/gpu/drm/panel/panel-truly-nt35597.c
@@ -280,6 +280,7 @@ static int truly_35597_power_on(struct truly_nt35597 *ctx)
 	gpiod_set_value(ctx->reset_gpio, 1);
 	usleep_range(10000, 20000);
 	gpiod_set_value(ctx->reset_gpio, 0);
+	usleep_range(10000, 20000);
 
 	return 0;
 }
-- 
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