Re: [PATCH] fbdev: atyfb: add stubs for aty_{ld,st}_lcd()

[Ville Syrjälä]

On Sun, Feb 21, 2021 at 07:28:53PM -0800, Randy Dunlap wrote:
> Fix build errors when these functions are not defined.
> 
> ../drivers/video/fbdev/aty/atyfb_base.c: In function 'aty_power_mgmt':
> ../drivers/video/fbdev/aty/atyfb_base.c:2002:7: error: implicit declaration of function 'aty_ld_lcd'; did you mean 'aty_ld_8'? [-Werror=implicit-function-declaration]
>  2002 |  pm = aty_ld_lcd(POWER_MANAGEMENT, par);
> ../drivers/video/fbdev/aty/atyfb_base.c:2004:2: error: implicit declaration of function 'aty_st_lcd'; did you mean 'aty_st_8'? [-Werror=implicit-function-declaration]
>  2004 |  aty_st_lcd(POWER_MANAGEMENT, pm, par);
> Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
> Reported-by: kernel test robot <lkp@xxxxxxxxx>
> Cc: linux-fbdev@xxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@xxxxxxxxxxx>
> Cc: Sam Ravnborg <sam@xxxxxxxxxxxx>
> Cc: Daniel Vetter <daniel@xxxxxxxx>
> Cc: David Airlie <airlied@xxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> ---
>  drivers/video/fbdev/aty/atyfb_base.c |    9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> --- linux-next-20210219.orig/drivers/video/fbdev/aty/atyfb_base.c
> +++ linux-next-20210219/drivers/video/fbdev/aty/atyfb_base.c
> @@ -175,6 +175,15 @@ u32 aty_ld_lcd(int index, const struct a
>  		return aty_ld_le32(LCD_DATA, par);
>  	}
>  }
> +#else /* defined(CONFIG_PMAC_BACKLIGHT) || defined(CONFIG_FB_ATY_BACKLIGHT) \
> +	 defined(CONFIG_FB_ATY_GENERIC_LCD) */

A better fix would seem to be to include these functions if
CONFIG_PPC_PMAC is enabled. Otherwise the PM code will surely
not work correctly. Though I'm not sure if that PPC PM
code makes any sense w/o LCD/backlight support anyway.

> +void aty_st_lcd(int index, u32 val, const struct atyfb_par *par)
> +{ }
> +
> +u32 aty_ld_lcd(int index, const struct atyfb_par *par)
> +{
> +	return 0;
> +}
>  #endif /* defined(CONFIG_PMAC_BACKLIGHT) || defined (CONFIG_FB_ATY_GENERIC_LCD) */
>  
>  #ifdef CONFIG_FB_ATY_GENERIC_LCD
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-- 
Ville Syrjälä
Intel