[PATCH] i810fb: make probe of DDC3 optional

[PATCH] i810fb: make probe of DDC3 optional

[Manuel Lauss]

Some time before 2.6.15, a third DDC channel was added to i810fb.
On systems where these ddc pins are not connected, the probe
takes about 10 seconds.

Introduce a config option to disable the probe on ddc channel 3.
Reduces boot time on my i815 laptop by 10 seconds.


diff -Naurp linux-2.6.15/drivers/video/Kconfig linux-2.6.15-b/drivers/video/Kconfig
--- linux-2.6.15/drivers/video/Kconfig	2006-01-03 04:21:10.000000000 +0100
+++ linux-2.6.15-b/drivers/video/Kconfig	2006-01-25 08:02:54.772567000 +0100
@@ -728,6 +728,16 @@ config FB_I810_I2C
 	select I2C_ALGOBIT
 	help
 
+config FB_I810_I2C_NODDC3
+	bool "Disable probing on DDC3"
+	depends on FB_I810_I2C
+	default y
+	help
+	  Select this if you want to skip the probe of DDC3. On I810 where
+	  the DDC3 pins are not connected, probing will take a very long time,
+	  enabling this option will skip this probe altogether, shortening
+	  boot/module-load time by about 10 seconds.
+
 config FB_INTEL
 	tristate "Intel 830M/845G/852GM/855GM/865G support (EXPERIMENTAL)"
 	depends on FB && EXPERIMENTAL && PCI && X86_32
diff -Naurp linux-2.6.15/drivers/video/i810/i810-i2c.c linux-2.6.15-b/drivers/video/i810/i810-i2c.c
--- linux-2.6.15/drivers/video/i810/i810-i2c.c	2006-01-03 04:21:10.000000000 +0100
+++ linux-2.6.15-b/drivers/video/i810/i810-i2c.c	2006-01-25 08:00:20.822567000 +0100
@@ -190,6 +190,11 @@ int i810_probe_i2c_connector(struct fb_i
         u8 *edid = NULL;
         int i;
 
+#ifdef CONFIG_FB_I810_I2C_NODDC3
+	if (conn == 3)
+		return 1;
+#endif
+
 	DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn);
 	if (conn < 4) {
 		for (i = 0; i < 3; i++) {


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Re: [PATCH] i810fb: make probe of DDC3 optional

[Antonino A. Daplas]

Manuel Lauss wrote:
> Some time before 2.6.15, a third DDC channel was added to i810fb.
> On systems where these ddc pins are not connected, the probe
> takes about 10 seconds.
> 
> Introduce a config option to disable the probe on ddc channel 3.
> Reduces boot time on my i815 laptop by 10 seconds.

Thanks.  Would a boot option be preferable than config?  Default would
be to skip probing the 3rd bus.

If you agree, I'll do the patch myself.

Tony


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Re: [PATCH] i810fb: make probe of DDC3 optional

[Manuel Lauss]

On Wed, Jan 25, 2006 at 03:23:58PM +0800, Antonino A. Daplas wrote:
> Manuel Lauss wrote:
> > Some time before 2.6.15, a third DDC channel was added to i810fb.
> > On systems where these ddc pins are not connected, the probe
> > takes about 10 seconds.
> > 
> > Introduce a config option to disable the probe on ddc channel 3.
> > Reduces boot time on my i815 laptop by 10 seconds.
> 
> Thanks.  Would a boot option be preferable than config?  Default would
> be to skip probing the 3rd bus.

of course.
 
> If you agree, I'll do the patch myself.

fine with me, thanks.

> Tony

-- 
 Manuel Lauss


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Re: [PATCH] i810fb: make probe of DDC3 optional

[Antonino A. Daplas]

Manuel Lauss wrote:
> On Wed, Jan 25, 2006 at 03:23:58PM +0800, Antonino A. Daplas wrote:
>> Manuel Lauss wrote:
>>> Some time before 2.6.15, a third DDC channel was added to i810fb.
>>> On systems where these ddc pins are not connected, the probe
>>> takes about 10 seconds.
>>>
>>> Introduce a config option to disable the probe on ddc channel 3.
>>> Reduces boot time on my i815 laptop by 10 seconds.
>> Thanks.  Would a boot option be preferable than config?  Default would
>> be to skip probing the 3rd bus.
> 
> of course.
>  
>> If you agree, I'll do the patch myself.
> 
> fine with me, thanks.

Can you test this patch?

Probing for the 3rd bus needs to be done explicitly:

video=i810fb:ddc3; or

modprobe i810fb i810fb.ddc3=1

Tony 

diff --git a/drivers/video/i810/i810-i2c.c b/drivers/video/i810/i810-i2c.c
index e22d56e..231fe90 100644
--- a/drivers/video/i810/i810-i2c.c
+++ b/drivers/video/i810/i810-i2c.c
@@ -191,11 +191,11 @@ int i810_probe_i2c_connector(struct fb_i
         u8 *edid = NULL;
         int i;
 
-	DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn);
-	if (conn < 4) {
+	DPRINTK("i810-i2c: Probe DDC%i Bus\n", conn+1);
+	if (conn < par->ddc_num) {
 		for (i = 0; i < 3; i++) {
 			/* Do the real work */
-			edid = i810_do_probe_i2c_edid(&par->chan[conn-1]);
+			edid = i810_do_probe_i2c_edid(&par->chan[conn]);
 			if (edid) 
 				break;
 		}
diff --git a/drivers/video/i810/i810.h b/drivers/video/i810/i810.h
index 6c187d5..579195c 100644
--- a/drivers/video/i810/i810.h
+++ b/drivers/video/i810/i810.h
@@ -280,6 +280,7 @@ struct i810fb_par {
 	u32 blit_bpp;
 	u32 ovract;
 	u32 cur_state;
+	u32 ddc_num;
 	int mtrr_reg;
 	u16 bltcntl;
 	u8 interlace;
diff --git a/drivers/video/i810/i810_main.c b/drivers/video/i810/i810_main.c
index 266d0ab..d8467c0 100644
--- a/drivers/video/i810/i810_main.c
+++ b/drivers/video/i810/i810_main.c
@@ -149,6 +149,7 @@ static int vyres      __devinitdata;
 static int sync       __devinitdata;
 static int extvga     __devinitdata;
 static int dcolor     __devinitdata;
+static int ddc3       __devinitdata = 2;
 
 /*------------------------------------------------------------*/
 
@@ -1763,6 +1764,8 @@ static void __devinit i810_init_defaults
 	if (sync) 
 		par->dev_flags |= ALWAYS_SYNC;
 
+	par->ddc_num = ddc3;
+
 	if (bpp < 8)
 		bpp = 8;
 	
@@ -1885,7 +1888,7 @@ static void __devinit i810fb_find_init_m
 	int found = 0;
 #ifdef CONFIG_FB_I810_I2C
 	int i;
-	int err;
+	int err = 1;
 	struct i810fb_par *par = info->par;
 #endif
 
@@ -1895,8 +1898,8 @@ static void __devinit i810fb_find_init_m
 #ifdef CONFIG_FB_I810_I2C
 	i810_create_i2c_busses(par);
 
-	for (i = 0; i < 4; i++) {
-		err = i810_probe_i2c_connector(info, &par->edid, i+1);
+	for (i = 0; i < par->ddc_num + 1; i++) {
+		err = i810_probe_i2c_connector(info, &par->edid, i);
 		if (!err)
 			break;
 	}
@@ -1983,6 +1986,8 @@ static int __devinit i810fb_setup(char *
 			vsync2 = simple_strtoul(this_opt+7, NULL, 0);
 		else if (!strncmp(this_opt, "dcolor", 6))
 			dcolor = 1;
+		else if (!strncmp(this_opt, "ddc3", 4))
+			ddc3 = 3;
 		else
 			mode_option = this_opt;
 	}
@@ -2190,6 +2195,8 @@ MODULE_PARM_DESC(sync, "wait for accel e
 module_param(dcolor, bool, 0);
 MODULE_PARM_DESC(dcolor, "use DirectColor visuals"
 		 " (default = 0 = TrueColor)");
+module_param(ddc3, bool, 0);
+MODULE_PARM_DESC(ddc3, "Probe DDC bus 3 (default = 0 = no)");
 module_param(mode_option, charp, 0);
 MODULE_PARM_DESC(mode_option, "Specify initial video mode");
 


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Re: [PATCH] i810fb: make probe of DDC3 optional

[Manuel Lauss]

On Wed, Jan 25, 2006 at 03:49:34PM +0800, Antonino A. Daplas wrote:
> Manuel Lauss wrote:
> > On Wed, Jan 25, 2006 at 03:23:58PM +0800, Antonino A. Daplas wrote:
> >> Manuel Lauss wrote:
> >>> Some time before 2.6.15, a third DDC channel was added to i810fb.
> >>> On systems where these ddc pins are not connected, the probe
> >>> takes about 10 seconds.
> >>>
> >>> Introduce a config option to disable the probe on ddc channel 3.
> >>> Reduces boot time on my i815 laptop by 10 seconds.
> >> Thanks.  Would a boot option be preferable than config?  Default would
> >> be to skip probing the 3rd bus.
> > 
> > of course.
> >  
> >> If you agree, I'll do the patch myself.
> > 
> > fine with me, thanks.
> 
> Can you test this patch?
> 
> Probing for the 3rd bus needs to be done explicitly:
> 
> video=i810fb:ddc3; or
> 
> modprobe i810fb i810fb.ddc3=1

Works as expected. Only built-in tested, though.

-- 
 Manuel Lauss


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Re: [PATCH] i810fb: make probe of DDC3 optional

[Antonino A. Daplas]

Manuel Lauss wrote:
> On Wed, Jan 25, 2006 at 03:49:34PM +0800, Antonino A. Daplas wrote:
>> Manuel Lauss wrote:
>>> On Wed, Jan 25, 2006 at 03:23:58PM +0800, Antonino A. Daplas wrote:
>>>> Manuel Lauss wrote:
>> Can you test this patch?
>>
>> Probing for the 3rd bus needs to be done explicitly:
>>
>> video=i810fb:ddc3; or
>>
>> modprobe i810fb i810fb.ddc3=1
> 
> Works as expected. Only built-in tested, though.
> 

Thanks.

Tony


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switching betwwen LCD and CRT display

[ramprasad]

Hi ,
    I am using 8Bpp LCD panel and i also have VGA( 16BPP) out on my 
device.I want to switch between these.How can i do this with out 
 restarting the device. I am using pxa (255) processor for this.

Thanks in advance,
Ramprasad




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