linux-kernel - [PATCH v1] fbtft: fb_st7789v: added reset on init

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Date:   Fri, 13 Aug 2021 08:25:10 +0200
From:   Oliver Graute <oliver.graute@...oconnector.com>
To:     gregkh@...uxfoundation.org
Cc:     oliver.graute@...il.com,
        Oliver Graute <oliver.graute@...oconnector.com>,
        Carlis <zhangxuezhi1@...ong.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v1] fbtft: fb_st7789v: added reset on init_display()

staging: fbtft: fb_st7789v: reset display before initialization

In rare cases the display is flipped or mirrored. This was observed more
often in a low temperature environment. A clean reset on init_display()
should help to get registers in a sane state.

Signed-off-by: Oliver Graute <oliver.graute@...oconnector.com>
---
 drivers/staging/fbtft/fb_st7789v.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/staging/fbtft/fb_st7789v.c b/drivers/staging/fbtft/fb_st7789v.c
index 3a280cc1892c..0a2dbed9ffc7 100644
--- a/drivers/staging/fbtft/fb_st7789v.c
+++ b/drivers/staging/fbtft/fb_st7789v.c
@@ -82,6 +82,8 @@ enum st7789v_command {
 {
 	int rc;

+	par->fbtftops.reset(par);
+
 	rc = init_tearing_effect_line(par);
 	if (rc)
 		return rc;
-- 
2.17.1