linux-kernel - [PATCH v2 2/6] drm/panel: mantix: Tweak init sequence

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Message-Id: <8451831b60d5ecb73a156613d98218a31bd55680.1605688147.git.agx@sigxcpu.org>
Date:   Wed, 18 Nov 2020 09:29:49 +0100
From:   Guido Günther <agx@...xcpu.org>
To:     Thierry Reding <thierry.reding@...il.com>,
        Sam Ravnborg <sam@...nborg.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rob Herring <robh+dt@...nel.org>,
        Ondrej Jirman <megous@...ous.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Lubomir Rintel <lkundrak@...sk>,
        Mark Brown <broonie@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        allen <allen.chen@....com.tw>,
        Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/6] drm/panel: mantix: Tweak init sequence

We've seen some (non permanent) burn in and bad white balance
on some of the panels. Adding this bit from a vendor supplied
sequence fixes it.

Fixes: 72967d5616d3 ("drm/panel: Add panel driver for the Mantix MLAF057WE51-X DSI panel")
Signed-off-by: Guido Günther <agx@...xcpu.org>
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
---
 drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
index 0c5f22e95c2d..624d17b96a69 100644
--- a/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
+++ b/drivers/gpu/drm/panel/panel-mantix-mlaf057we51.c
@@ -22,6 +22,7 @@
 /* Manufacturer specific Commands send via DSI */
 #define MANTIX_CMD_OTP_STOP_RELOAD_MIPI 0x41
 #define MANTIX_CMD_INT_CANCEL           0x4C
+#define MANTIX_CMD_SPI_FINISH           0x90
 
 struct mantix {
 	struct device *dev;
@@ -66,6 +67,10 @@ static int mantix_init_sequence(struct mantix *ctx)
 	dsi_generic_write_seq(dsi, 0x80, 0x64, 0x00, 0x64, 0x00, 0x00);
 	msleep(20);
 
+	dsi_generic_write_seq(dsi, MANTIX_CMD_SPI_FINISH, 0xA5);
+	dsi_generic_write_seq(dsi, MANTIX_CMD_OTP_STOP_RELOAD_MIPI, 0x00, 0x2F);
+	msleep(20);
+
 	dev_dbg(dev, "Panel init sequence done\n");
 	return 0;
 }
-- 
2.29.2