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[92.176.231.205]) by smtp.gmail.com with ESMTPSA id p6-20020a5d48c6000000b0032db8cccd3asm32812wrs.114.2023.11.16.10.07.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Nov 2023 10:07:54 -0800 (PST) From: Javier Martinez Canillas To: linux-kernel@vger.kernel.org Cc: Sahaj Sarup , Javier Martinez Canillas , Andy Shevchenko , Geert Uytterhoeven , Helge Deller , Sam Ravnborg , Thomas Zimmermann , =?utf-8?q?Uwe_Kleine-K=C3=B6nig?= , 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 Message-ID: <20231116180743.2763021-2-javierm@redhat.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20231116180743.2763021-1-javierm@redhat.com> References: <20231116180743.2763021-1-javierm@redhat.com> MIME-Version: 1.0 X-Spam-Status: No, score=-2.2 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_NONE,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (snail.vger.email [0.0.0.0]); Thu, 16 Nov 2023 10:08:10 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1782744970970235787 X-GMAIL-MSGID: 1782744970970235787 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 Signed-off-by: Javier Martinez Canillas --- 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;