Re: [PATCH] DDC2/I2C Support

["Antonino A. Daplas" <adaplas@softhome.net>]

On Tuesday 06 January 2004 01:16, Kronos wrote:
> Il Mon, Jan 05, 2004 at 09:31:02AM -0500, adaplas@pol.net ha scritto:
> > 1. [fbi2c.c]:  Added preliminary generic DDC2/i2c support (derived from
> > xf86DDC.c and xf86i2.c)
> >
> > 	This is a configurable option (CONFIG_FB_I2C). 	For now, I only used
> > "default" timeout values which may not work for all devices.
> >
> > 	Most drivers need to implement only two functions --
> >
> > 		void xxxfb_i2c_getbits(struct fb_info *info, signed long *clock, signed
> > long *data)
> > 		void xxxfb_i2c_putbits(struct fb_info *info, signed long clock, signed
> > long data)
>
> In fbi2c.c you are duplicating the i2c layer that's already there in the
> kernel. Each driver should  have its set of function to  control SDA and
> SCL and then it's only a matter of calling i2c_transfer.
>
> I wrote the i2c stuff for the new radeon driver, look here:
> bk://ppc.bkbits.net/linuxppc-2.5-benh
> (drivers/video/aty/radeon_i2c.c)

Ok.  See my reply to Ben H.

>
> > 2. [fbmon.c]: Consolidated different ways of getting EDID with the
> > following function:
> >
> > 	unsigned char *fb_get_edid(struct fb_info *info, struct pci_dev *pdev,
> > int what)
> >
> > 		the parameter "what" can be:
> > 			EDID_DDC2 - get EDID via DDC2/I2C fb_get_edid_from_ddc2()
> > 			EDID_ARCH - get	EDID via BIOS or OF get_EDID_from_{OF|BIOS}()
>
> Hum, I don't like this kind of "multiplexing". I think that EDID
> reading (if possibile) should be done inside the driver which knows how
> to do it.
>
> Also, why did you remove all the printk's? Ok, show_edid is a bit too
> verbose but it's usefull for debugging.

The first time I wrote the edid parser, show_edid() was never meant to have 
all that printk's :-).  It's only preliminary code in preparation for 
extending struct fb_monspecs.  But I'll bring it back, possibly when DEBUG is 
defined.

Tony


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