linux-kernel - [PATCH v1] staging: fbtft: fb_st7789v: reset display before initialization

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Date:   Thu, 10 Feb 2022 09:53:22 +0100
From:   Oliver Graute <oliver.graute@...oconnector.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dennis Menschel <menschel-d@...teo.de>
Cc:     Oliver Graute <oliver.graute@...oconnector.com>,
        stable@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-fbdev@...r.kernel.org, linux-staging@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: [PATCH v1] 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.

Fixes: ef8f317795da (staging: fbtft: use init function instead of init sequence)
Cc: stable@...r.kernel.org
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