linux-kernel - [PATCH 4.19 203/276] drm/panel: otm8009a: Add delay at the end of initialization

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Message-Id: <20190530030537.820652297@linuxfoundation.org>
Date:   Wed, 29 May 2019 20:06:01 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Yannick Fertré <yannick.fertre@...com>,
        Philippe Cornu <philippe.cornu@...com>,
        Thierry Reding <treding@...dia.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 203/276] drm/panel: otm8009a: Add delay at the end of initialization

[ Upstream commit 0084c3c71126fc878c6dab8a6ab8ecc484c2be02 ]

At the end of initialization, a delay is required by the panel. Without
this delay, the panel could received a frame early & generate a crash of
panel (black screen).

Signed-off-by: Yannick Fertré <yannick.fertre@...com>
Reviewed-by: Philippe Cornu <philippe.cornu@...com>
Tested-by: Philippe Cornu <philippe.cornu@...com>
Signed-off-by: Thierry Reding <treding@...dia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1553155445-13407-1-git-send-email-yannick.fertre@st.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
index 87fa316e1d7b0..58ccf648b70fb 100644
--- a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
+++ b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c
@@ -248,6 +248,9 @@ static int otm8009a_init_sequence(struct otm8009a *ctx)
 	/* Send Command GRAM memory write (no parameters) */
 	dcs_write_seq(ctx, MIPI_DCS_WRITE_MEMORY_START);
 
+	/* Wait a short while to let the panel be ready before the 1st frame */
+	mdelay(10);
+
 	return 0;
 }
 
-- 
2.20.1