From: Javier Martinez Canillas <javierm@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: "Sahaj Sarup" <sahaj.sarup@linaro.org>,
"Javier Martinez Canillas" <javierm@redhat.com>,
"Andy Shevchenko" <andriy.shevchenko@linux.intel.com>,
"Geert Uytterhoeven" <geert@linux-m68k.org>,
"Helge Deller" <deller@gmx.de>, "Sam Ravnborg" <sam@ravnborg.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"Uwe Kleine-König" <u.kleine-koenig@pengutronix.de>,
dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org
Subject: [PATCH 2/3] fbdev: ssd1307fb: Change "solomon,page-offset" property default value
Date: Thu, 16 Nov 2023 19:07:38 +0100 [thread overview]
Message-ID: <20231116180743.2763021-2-javierm@redhat.com> (raw)
In-Reply-To: <20231116180743.2763021-1-javierm@redhat.com>
This is used to specify the page start address offset of the display RAM.
The value is used as offset when setting the page start address with the
SSD130X_SET_PAGE_RANGE command, and the driver currently sets its value to
1 if the property is not present in the Device Tree.
But the datasheet mentions that the value on reset for the page start is a
0, so it makes more sense to also have 0 as the default value for the page
offset if the property is not present.
In fact, using a default value of 1 leads to the display not working when
the fbdev is attached to the framebuffer console.
Reported-by: Sahaj Sarup <sahaj.sarup@linaro.org>
Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
---
drivers/video/fbdev/ssd1307fb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index 5ae48e36fccb..34f014bf4994 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -637,7 +637,7 @@ static int ssd1307fb_probe(struct i2c_client *client)
par->height = 16;
if (device_property_read_u32(dev, "solomon,page-offset", &par->page_offset))
- par->page_offset = 1;
+ par->page_offset = 0;
if (device_property_read_u32(dev, "solomon,col-offset", &par->col_offset))
par->col_offset = 0;
--
2.41.0
next parent reply other threads:[~2023-11-16 18:07 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20231116180743.2763021-1-javierm@redhat.com>
2023-11-16 18:07 ` Javier Martinez Canillas [this message]
2023-11-17 21:15 ` [PATCH 2/3] fbdev: ssd1307fb: Change "solomon,page-offset" property default value Andy Shevchenko
2023-11-17 22:18 ` Javier Martinez Canillas
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