[PATCH v2 3/3] ARM: Samsung: Rework platform data of s3c-fb driver

Jingoo Han jg1.han at samsung.com
Fri Mar 16 05:48:19 EDT 2012


> -----Original Message-----
> From: Darius Augulis [mailto:augulis.darius at gmail.com]
> Sent: Friday, March 16, 2012 6:16 PM
> To: Jingoo Han
> Cc: Thomas Abraham; linux-fbdev at vger.kernel.org; FlorianSchandinat at gmx.de; linux-arm-
> kernel at lists.infradead.org; linux-samsung-soc at vger.kernel.org; ben-linux at fluff.org; patches at linaro.org;
> kgene.kim at samsung.com; Kyungmin Park; JeongHyeon Kim; Heiko Stuebner; Kwangwoo Lee; Mark Brown; Peter
> Korsgaard; Maurus Cuelenaere; Tushar Behera
> Subject: Re: [PATCH v2 3/3] ARM: Samsung: Rework platform data of s3c-fb driver
> 
> On Fri, Mar 16, 2012 at 10:07 AM, Jingoo Han <jg1.han at samsung.com> wrote:
> >
> >
> >> -----Original Message-----
> >> From: Darius Augulis [mailto:augulis.darius at gmail.com]
> >> Sent: Friday, March 16, 2012 4:47 PM
> >> To: Jingoo Han
> >> Cc: Thomas Abraham; linux-fbdev at vger.kernel.org; FlorianSchandinat at gmx.de; linux-arm-
> >> kernel at lists.infradead.org; linux-samsung-soc at vger.kernel.org; ben-linux at fluff.org;
> patches at linaro.org;
> >> kgene.kim at samsung.com; Kyungmin Park; JeongHyeon Kim; Heiko Stuebner; Kwangwoo Lee; Mark Brown; Peter
> >> Korsgaard; Maurus Cuelenaere; Tushar Behera
> >> Subject: Re: [PATCH v2 3/3] ARM: Samsung: Rework platform data of s3c-fb driver
> >>
> >> On Fri, Mar 16, 2012 at 3:39 AM, Jingoo Han <jg1.han at samsung.com> wrote:
> >>
> >> it's not a bug, because it's working like it was intended to. it was
> >> reviewed and accepted by maintainers before merging to main line.
> >> you do not have rights to drop it because you don't like it.
> >> You are doing changes - please do it correctly and do not break
> >> existing functionality.
> >> btw, you still not answered my question: why these two s3c_fb_pd_win
> >> structures in mach-mini6410.c is a problem? They are declared on the
> >> stack, but platform data uses only single one. mini6410 rewrites its
> >> s3c-fb platform data with data from one of these two structures
> >> dynamically. Why it's a bug? You want to remove this dynamic selection
> >> which could be leaved there with reworked framework too.
> >
> >
> > It's just bug.
> >
> > struct s3c_fb_pd_win should be used for windows of FIMD IP.
> > It should not be used for selecting multi-LCDs.
> 
> why not? s3c_fb_pd_win contains timing values which depend directly on
> LCD size and resolution.
> Please look into the code again - mini6410 doesn't use platform data
> so select different LCD sizes.
> It has only single window in platform data - exactly what you want.
> Now tell my, why you are arguing, that this platform data cannot be
> rewritten dynamically by board setup routines at kernel startup time?
> Many ARM architectures are doing the same - takes kernel command line
> argument to select LCD and passes necessary data for its fb drivers
> via platform data structures. It not a bug, it's correct approach to
> support different sizes of LCD display for the same board.


Hey, it is not my point.
To take kernel command line is not problem to support multiple LCDs.

My point is that s3c_fb_pd_win should not include variable LCD option.
So, if you want to support multiple LCDs, you should use another variable,
instead of using s3c_fb_pd_win[0] and s3c_fb_pd_win[1] as 4.3" LCD, 7.0" LCD.

You use s3c_fb_pd_win[0], s3c_fb_pd_win[1] as 4.3" LCD, 7.0" LCD.
However, s3c_fb_pd_win[0], s3c_fb_pd_win[1] means the windows of FIMD IP.


> You are simply lazy to deal with little bit different code of mini6410
> and real6410 because they have support for multiple LCDs and other
> s3c-fb boards doesn't.
> This is a reason why you want to drop it and not because it's a bug.
> Hope other maintainers and code reviewers understand this situation correctly.
> 
> >
> > struct s3c_fb_pd_win should include information of windows of FIMD IP, s3c_fb_pd_win[0],
> s3c_fb_pd_win[1] represents window 0,
> > window 1 of FIMD IP. However, your code includes information of LCD, it means that struct
> s3c_fb_pd_win represents 4.3" LCD, 7.0"
> > LCD. It is wrong usage.
> >
> >
> >>
> >> > 'struct s3c_fb_pd_win' is used not for LCD, but for windows of FIMD IP. So, 'struct s3c_fb_pd_win'
> >> should not be used to select LCD.
> >> > The mach-aquila.c uses two 'struct s3c_fb_pd_win' like you, however 'struct s3c_fb_pd_win' don't
> make
> >> problem with Thomas's
> >> > patchset. It is because mach-aquila.c use 'struct s3c_fb_pd_win' for only windows of FIMD IP.
> >> > We don't have to responsibility to keep wrong code. If you have kept the rule, Thomas's patch would
> >> not make the compatibility
> >> > problem with your code. Why we should keep aberration such as your code? If you want to select two
> >> LCDs, please find other way.
> >> >
> >> >
> >> >>
> >> >> Darius A.
> >> >
> >




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