From: "Yannick Fertré" <yannick.fertre@st.com>
To: Yannick Fertre <yannick.fertre@st.com>,
Philippe Cornu <philippe.cornu@st.com>,
Thierry Reding <thierry.reding@gmail.com>,
"David Airlie" <airlied@linux.ie>,
Daniel Vetter <daniel@ffwll.ch>,
<dri-devel@lists.freedesktop.org>, <linux-kernel@vger.kernel.org>,
<linux-stm32@st-md-mailman.stormreply.com>
Subject: [PATCH] drm/panel: otm8009a: add delay at the end of initialization
Date: Thu, 21 Mar 2019 09:04:05 +0100 [thread overview]
Message-ID: <1553155445-13407-1-git-send-email-yannick.fertre@st.com> (raw)
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@st.com>
---
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 87fa316..58ccf64 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;
}
--
2.7.4
next reply other threads:[~2019-03-21 8:04 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-21 8:04 Yannick Fertré [this message]
2019-03-26 12:48 ` [PATCH] drm/panel: otm8009a: add delay at the end of initialization Philippe CORNU
2019-04-03 16:22 ` Thierry Reding
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