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Call drm_mode_size_dumb() to compute dumb-buffer scanline pitch and buffer size. The hardware requires the framebuffer width to be a multiple of 8. The scanline pitch has to be large enough to support this. Therefore compute the byte size of 8 pixels in the given color mode and align the pitch accordingly. v5: - fix typo in commit description Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de> Cc: Philipp Zabel <p.zabel@pengutronix.de> Cc: Shawn Guo <shawnguo@kernel.org> Cc: Sascha Hauer <s.hauer@pengutronix.de> Cc: Pengutronix Kernel Team <kernel@pengutronix.de> Cc: Fabio Estevam <festevam@gmail.com> Link: https://lore.kernel.org/r/20250821081918.79786-11-tzimmermann@suse.de