From: Marcus Folkesson <marcus.folkesson@gmail.com>
To: Javier Martinez Canillas <javierm@redhat.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>,
Simona Vetter <simona@ffwll.ch>
Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
Marcus Folkesson <marcus.folkesson@gmail.com>
Subject: [PATCH] drm/sitronix/st7571-i2c: reset position before clearing display
Date: Sat, 13 Sep 2025 08:09:40 +0200 [thread overview]
Message-ID: <20250913-st7571-reset-v1-1-ae5f58acdf8d@gmail.com> (raw)
We cannot know where the write pointer is, always reset position to
(0,0) before clearing display.
Signed-off-by: Marcus Folkesson <marcus.folkesson@gmail.com>
---
drivers/gpu/drm/sitronix/st7571-i2c.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/sitronix/st7571-i2c.c b/drivers/gpu/drm/sitronix/st7571-i2c.c
index a6c4a6738dedf5881328414e9d8810d3af2a6fe4..32b91d65b768b26caa7dcef42a00d36f236fbc32 100644
--- a/drivers/gpu/drm/sitronix/st7571-i2c.c
+++ b/drivers/gpu/drm/sitronix/st7571-i2c.c
@@ -263,6 +263,7 @@ static int st7571_fb_clear_screen(struct st7571_device *st7571)
u32 npixels = st7571->ncols * round_up(st7571->nlines, ST7571_PAGE_HEIGHT) * st7571->bpp;
char pixelvalue = 0x00;
+ st7571_set_position(st7571, 0, 0);
for (int i = 0; i < npixels; i++)
regmap_bulk_write(st7571->regmap, ST7571_DATA_MODE, &pixelvalue, 1);
---
base-commit: 91494dee1091a14d91da6bcb39e12a907765c793
change-id: 20250911-st7571-reset-785838285415
Best regards,
--
Marcus Folkesson <marcus.folkesson@gmail.com>
next reply other threads:[~2025-09-13 6:09 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-13 6:09 Marcus Folkesson [this message]
2025-09-17 9:32 ` Javier Martinez Canillas
2025-09-18 8:54 ` Marcus Folkesson
2025-09-18 11:07 ` Javier Martinez Canillas
2025-10-03 6:57 ` Marcus Folkesson
2025-10-03 10:04 ` Javier Martinez Canillas
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