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SubjectRe: [PATCH v2 2/3] gpu/drm: ingenic: Switch emulated fbdev to 16bpp
On Wed, Feb 26, 2020 at 01:30:40AM -0300, Paul Cercueil wrote:
> The fbdev emulation is only ever used on Ingenic SoCs to run old SDL1
> based games at 16bpp (rgb565). Recent applications generally talk to
> DRM directly, and can request their favourite pixel format; so we can
> make everybody happy by switching the emulated fbdev to 16bpp.
>
> v2: No change
>
> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
> ---
> drivers/gpu/drm/ingenic/ingenic-drm.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c b/drivers/gpu/drm/ingenic/ingenic-drm.c
> index 5493a80d7d2f..3f8cc98d41fe 100644
> --- a/drivers/gpu/drm/ingenic/ingenic-drm.c
> +++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
> @@ -807,7 +807,7 @@ static int ingenic_drm_probe(struct platform_device *pdev)
> goto err_devclk_disable;
> }
>
> - ret = drm_fbdev_generic_setup(drm, 32);
> + ret = drm_fbdev_generic_setup(drm, 16);

This will conflict with Thomas' work to remove the error code, so might
need a rebase. Now for the patch itself your supposed to set
drm_device->mode_config.preferred_bpp and leave this here as 0. That way
userspace can also know what's the best option.

Maybe in the future we could auto-compute the preferred_bpp from just
taking the first format of the first primary plane, but atm not there.

With the above change:

Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
> if (ret)
> dev_warn(dev, "Unable to start fbdev emulation: %i", ret);
>
> --
> 2.25.0
>

--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

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