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[ Upstream commit125459e19e] Fix bug in nt35560_set_brightness() which causes the function to erroneously report an error. mipi_dsi_dcs_write() returns either a negative value when an error occurred or a positive number of bytes written when no error occurred. The buggy code reports an error under either condition. Fixes:8152c2bfd7("drm/panel: Add driver for Sony ACX424AKP panel") Reviewed-by: Douglas Anderson <dianders@chromium.org> Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org> Signed-off-by: Brigham Campbell <me@brighamcampbell.com> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org> Link: https://lore.kernel.org/r/20250731032343.1258366-2-me@brighamcampbell.com Signed-off-by: Sasha Levin <sashal@kernel.org>