Re: [PATCH 04/26] drm/fb-helper: Add fill_info() functions

["Noralf Trønnes" <noralf@tronnes.org>]

Den 24.01.2019 17.58, skrev Daniel Vetter:
> The fbdev split between fix and var information is kinda
> pointless for drm drivers since everything is fixed: The fbdev
> emulation doesn't support changing modes at all.
> 
> Create a new simplified helper and use it in the generic fbdev
> helper code. Follow-up patches will beef it up more and roll
> it out to all drivers.
> 
> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
> ---
>  drivers/gpu/drm/drm_fb_helper.c | 27 +++++++++++++++++++++++++--
>  include/drm/drm_fb_helper.h     |  1 +
>  2 files changed, 26 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
> index 5eaccd202f4f..34c4ed378796 100644
> --- a/drivers/gpu/drm/drm_fb_helper.c
> +++ b/drivers/gpu/drm/drm_fb_helper.c
> @@ -2105,6 +2105,30 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
>  }
>  EXPORT_SYMBOL(drm_fb_helper_fill_var);
>  
> +/**
> + * drm_fb_helper_fill_info - initializes fbdev information
> + * @info: fbdev instance to set up
> + * @fb_helper: fb helper instance to use as template
> + *
> + *
> + * Sets up the variable and fixed fbdev metainformation from the given fb helper
> + * instance and the drm framebuffer allocated in &drm_fb_helper.fb.
> + *
> + * Drivers should call this (or their equivalent setup code) from their
> + * &drm_fb_helper_funcs.fb_probe callback after having allocated the fbdev
> + * backing storage framebuffer.
> + */
> +void drm_fb_helper_fill_info(struct fb_info *info,

No need to pass in fb_info it's available as fb_helper->fbdev. Set by
drm_fb_helper_alloc_fbi().

> +			     struct drm_fb_helper *fb_helper)
> +{
> +	struct drm_framebuffer *fb = fb_helper->fb;
> +
> +	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
> +	drm_fb_helper_fill_var(info, fb_helper, fb->width, fb->height);

AFAIU fb->width/height can be different from sizes->fb_width/fb_height
when there's double/triple buffering. I belive you need to use the sizes
values here.

Noralf.

> +
> +}
> +EXPORT_SYMBOL(drm_fb_helper_fill_info);
> +
>  static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper,
>  						uint32_t maxX,
>  						uint32_t maxY)
> @@ -3163,8 +3187,7 @@ int drm_fb_helper_generic_probe(struct drm_fb_helper *fb_helper,
>  #endif
>  	strcpy(fbi->fix.id, "DRM emulated");
>  
> -	drm_fb_helper_fill_fix(fbi, fb->pitches[0], fb->format->depth);
> -	drm_fb_helper_fill_var(fbi, fb_helper, sizes->fb_width, sizes->fb_height);
> +	drm_fb_helper_fill_info(fbi, fb_helper);
>  
>  	if (fb->funcs->dirty) {
>  		struct fb_ops *fbops;
> diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h
> index bb9acea61369..e8d92724f472 100644
> --- a/include/drm/drm_fb_helper.h
> +++ b/include/drm/drm_fb_helper.h
> @@ -292,6 +292,7 @@ void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helpe
>  			    uint32_t fb_width, uint32_t fb_height);
>  void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch,
>  			    uint32_t depth);
> +void drm_fb_helper_fill_info(struct fb_info *info, struct drm_fb_helper *fb_helper);
>  
>  void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper);
>  
> 
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