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[83.233.6.197]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-56e64fa7134sm1699740e87.122.2025.09.12.23.09.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 12 Sep 2025 23:09:55 -0700 (PDT) From: Marcus Folkesson Date: Sat, 13 Sep 2025 08:09:40 +0200 Subject: [PATCH] drm/sitronix/st7571-i2c: reset position before clearing display Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250913-st7571-reset-v1-1-ae5f58acdf8d@gmail.com> X-B4-Tracking: v=1; b=H4sIAKMKxWgC/x3MMQqAMAxA0atIZgtNNbR6FXEQjZqlSiMiFO9uc XzD/xmUk7BCX2VIfIvKEQuwrmDep7ixkaUYnHVkO0SjlyePJrHyZXyg0AQXqEWCkpyJV3n+3TC +7wdYQRDMXgAAAA== X-Change-ID: 20250911-st7571-reset-785838285415 To: Javier Martinez Canillas , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter Cc: dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, Marcus Folkesson X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1067; i=marcus.folkesson@gmail.com; h=from:subject:message-id; bh=gTOEkj4ZvjJRwjmvXK70zhZ6+r0iqgJJfzfUuKz4ewI=; b=owEBbQKS/ZANAwAKAYiATm9ZXVIyAcsmYgBoxQqrq2QBZ5XmdEg1YGZgvM51PpAyHQA1cma49 Pxth4Z6rlOJAjMEAAEKAB0WIQQFUaLotmy1TWTBLGWIgE5vWV1SMgUCaMUKqwAKCRCIgE5vWV1S MlHYD/4pbEnIrJLmXXp6nL/tqtzdNleFjnCyFXglVYfrviZpWfQcRHITojRjKvxWzP2IhDC4Y+P NrHgwauETMdNdnDxjGEpRUTqjujqCErHENLyl/hWAmpg1tx4P2HvVZcS5UpcSNqAH1ZnC/2fJOu R309eTTC7cs0LbDAuYtu/0Y3t+jtuncOIS1uE9KYjLt3EL0A99zbNuO6EnHYUM02Ded9Wr7ESHJ 1JAkWNVPHJfKOnHM0elGpcw/WkIRwotKNEJ1xua1RLpmikMNoaewSAMdQlTnS/n72RYujG3u8Xu AkeDC3J1s4JMLwmQZPg03zAnCi8ZYLpzspaGuqgx36Vlf29SKkKrGDg6vLBMWryKOwcirl155nI WB8NxD/VsqpeZATgf+OsybyVCyo736tm+bDvmc3ZRX6mH0mhb/p8aVVKXfiSvmdoPPTXGvMJkSI BMQwPw2vKvV/UubmUGF0tdaSmMuxDXRpJplymv22U65E8kX+sW4cOt4frj0I7Fdm6I4Kh3cAnK2 Gh10oc/rW9BWmIHV9vN/gODDIJUzmkfO8156H2qiN6pgr4cApu0HiaTVCeNruFsmJxBQZYF5LoB 745SP3hFHr0c0ackuVP6pJm7dhJpTH7i1E5UUnwqztkPAUNVST7csZwSasC5Vk5M7P2I0G8de6g 71uA8W1/HEA+rpQ== X-Developer-Key: i=marcus.folkesson@gmail.com; a=openpgp; fpr=AB91D46C7E0F6E6FB2AB640EC0FE25D598F6C127 We cannot know where the write pointer is, always reset position to (0,0) before clearing display. Signed-off-by: Marcus Folkesson Reviewed-by: Javier Martinez Canillas --- 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/sitron= ix/st7571-i2c.c index a6c4a6738dedf5881328414e9d8810d3af2a6fe4..32b91d65b768b26caa7dcef42a0= 0d36f236fbc32 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 =3D st7571->ncols * round_up(st7571->nlines, ST7571_PAGE_HEIG= HT) * st7571->bpp; char pixelvalue =3D 0x00; =20 + st7571_set_position(st7571, 0, 0); for (int i =3D 0; i < npixels; i++) regmap_bulk_write(st7571->regmap, ST7571_DATA_MODE, &pixelvalue, 1); =20 --- base-commit: 91494dee1091a14d91da6bcb39e12a907765c793 change-id: 20250911-st7571-reset-785838285415 Best regards, --=20 Marcus Folkesson