linux-kernel - Re: [PATCH v1] staging: fbtft: fb

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Message-ID: <20200428185957.GL2014@kadam>
Date:   Tue, 28 Apr 2020 21:59:57 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Oliver Graute <oliver.graute@...il.com>
Cc:     devel@...verdev.osuosl.org, linux-fbdev@...r.kernel.org,
        gregkh@...uxfoundation.org,
        Oliver Graute <oliver.graute@...oconnector.com>,
        linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v1] staging: fbtft: fb_st7789v: Initialize the Display

On Mon, Apr 27, 2020 at 02:36:25PM +0200, Oliver Graute wrote:
> On 27/04/20, Dan Carpenter wrote:
> > On Mon, Apr 27, 2020 at 10:36:42AM +0200, Oliver Graute wrote:
> > > On 09/04/20, Dan Carpenter wrote:
> > > > On Thu, Apr 09, 2020 at 11:25:32AM +0200, Oliver Graute wrote:
> > > > > From: Oliver Graute <oliver.graute@...oconnector.com>
> > > > > 
> > > > > Set Gamma Values and Register Values for the HSD20_IPS
> > > > > 
> > > > > Signed-off-by: Oliver Graute <oliver.graute@...oconnector.com>
> > > > > ---
> > > > >  drivers/staging/fbtft/fb_st7789v.c | 12 ++++++------
> > > > >  1 file changed, 6 insertions(+), 6 deletions(-)
> > > > > 
> > > > > diff --git a/drivers/staging/fbtft/fb_st7789v.c b/drivers/staging/fbtft/fb_st7789v.c
> > > > > index 84c5af2dc9a0..b0aa96b703a8 100644
> > > > > --- a/drivers/staging/fbtft/fb_st7789v.c
> > > > > +++ b/drivers/staging/fbtft/fb_st7789v.c
> > > > > @@ -17,8 +17,8 @@
> > > > >  #define DRVNAME "fb_st7789v"
> > > > >  
> > > > >  #define DEFAULT_GAMMA \
> > > > > -	"70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25\n" \
> > > > > -	"70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25"
> > > > > +	"D0 05 0A 09 08 05 2E 44 45 0F 17 16 2B 33\n" \
> > > > > +	"D0 05 0A 09 08 05 2E 43 45 0F 16 16 2B 33"
> > > > 
> > > > How do you know this won't break someone else's setup?
> > > 
> > > Should I declare an extra define for my values?
> > > 
> > > +#define HSD20_IPS_GAMMA \
> > > +	"D0 05 0A 09 08 05 2E 44 45 0F 17 16 2B 33\n" \
> > > +	"D0 05 0A 09 08 05 2E 43 45 0F 16 16 2B 33"
> > > 
> > 
> > That's fine, but it can't be a compile time thing.  Both types of
> > hardware have to be working/available at run time.
> 
> ok, what is the proper way to handover the gamma values during run time?

Can you detect which are appropriate and set that in the probe()
function?

regards,
dan carpenter