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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>,
        Conor Dooley <conor+dt@kernel.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        David Airlie <airlied@gmail.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Rob Herring <robh+dt@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org
Subject: [PATCH 1/3] dt-bindings: display: ssd1307fb: Change "solomon,page-offset" default value
Date:   Thu, 16 Nov 2023 19:07:37 +0100
Message-ID: <20231116180743.2763021-1-javierm@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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>
---

 .../devicetree/bindings/display/solomon,ssd1307fb.yaml          | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
index 3afbb52d1b7f..badd81459aaa 100644
--- a/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
+++ b/Documentation/devicetree/bindings/display/solomon,ssd1307fb.yaml
@@ -35,7 +35,7 @@ properties:
 
   solomon,page-offset:
     $ref: /schemas/types.yaml#/definitions/uint32
-    default: 1
+    default: 0
     description:
       Offset of pages (band of 8 pixels) that the screen is mapped to
 
-- 
2.41.0