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The function dsi_update_bits() is defined in the dw-mipi-dsi-rockchip.c file, but not called elsewhere, so delete this unused function. drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c:367:20: warning: unused function 'dsi_update_bits'. https://bugzilla.openanolis.cn/show_bug.cgi?id=2414 Reported-by: Abaci Robot <abaci@linux.alibaba.com> Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Signed-off-by: Heiko Stuebner <heiko@sntech.de> Link: https://patchwork.freedesktop.org/patch/msgid/20221017084330.94117-1-jiapeng.chong@linux.alibaba.com