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Use the fbdev emulation that is optimized for DMA helpers. Avoids possible shadow buffering and makes the code simpler. Reported-by: Linus Walleij <linus.walleij@linaro.org> Link: https://lore.kernel.org/dri-devel/CACRpkdawSQsNqKJkSSoSw3HmMHyNXFUywxkdszpTC-a_uZA+tQ@mail.gmail.com/ Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Linus Walleij <linus.walleij@linaro.org> Link: https://patchwork.freedesktop.org/patch/msgid/20230313155138.20584-25-tzimmermann@suse.de