drm/mediatek: mtk_disp_gamma: Fix breakage due to merge issue
While the commit that was sent to the mailing lists was fine, something happened during merge and the mtk_gamma_set() function got broken as a writel() was turned into a readl(). Fix that by changing that back to the expected writel(). Fixes: a6b39cd2 ("drm/mediatek: De-commonize disp_aal/disp_gamma gamma_set functions") Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com> Link: https://patchwork.kernel.org/project/dri-devel/patch/20231025104940.140605-1-angelogioacchino.delregno@collabora.com/ Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
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