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

From: Randy Dunlap <rdunlap@infradead.org>
To: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
Cc: linux-kernel@vger.kernel.org, linux-fbdev@vger.kernel.org,
	kernel test robot <lkp@intel.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
	David Airlie <airlied@linux.ie>,
	dri-devel@lists.freedesktop.org, Sam Ravnborg <sam@ravnborg.org>
Subject: Re: [PATCH] fbdev: atyfb: add stubs for aty_{ld,st}_lcd()
Date: Wed, 24 Feb 2021 11:59:45 -0800	[thread overview]
Message-ID: <7d416971-ae9b-52a8-bfba-79c2c920ec6c@infradead.org> (raw)
In-Reply-To: <YDPtYx1uU5Y4HNZ7@intel.com>

On 2/22/21 9:44 AM, Ville Syrjälä wrote:
> 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@infradead.org>
>> Reported-by: kernel test robot <lkp@intel.com>
>> Cc: linux-fbdev@vger.kernel.org
>> Cc: dri-devel@lists.freedesktop.org
>> Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
>> Cc: Sam Ravnborg <sam@ravnborg.org>
>> Cc: Daniel Vetter <daniel@ffwll.ch>
>> Cc: David Airlie <airlied@linux.ie>
>> Cc: Jani Nikula <jani.nikula@linux.intel.com>
>> ---
>>  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.

Hi Ville,

I tried this:

-#if defined(CONFIG_PMAC_BACKLIGHT) || defined(CONFIG_FB_ATY_GENERIC_LCD) || \
-defined(CONFIG_FB_ATY_BACKLIGHT)
+#if defined(CONFIG_PPC_PMAC)

in both atyfb_base.c and atyfb.h, but then there is a build error in
mach64_ct.c when PPC_PMAC is not enabled but FB_ATY_GENERIC_LCD is enabled.
[mach64_ct.c is the only other user of aty_{ld,st}_lcd()]

or did you mean adding CONFIG_PPC_PMAC to that longish #if list?
(that's not how I understood your comment.)

I'll gladly step away and let you submit patches for this. :)

>> +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
>> _______________________________________________

thanks.
-- 
~Randy