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Subject[PATCH v3+]viafb: I2C/DDC LCD detection for VIA framebuffer
I2C/DDC LCD detection for VIA framebuffer

Adding legacy I2C/DDC support for VIA framebuffer, used to fix LCD
panel size and (if "via_active_dev" is empty default) force LCD
detection. This solving at least defaults on Chrome9 video
on HP mini 2133 notebook, but must be good in other cases,
include double-LCD. Also forcing viafb_active_dev to NULL as bugfix.

Signed-off-by: Dzianis Kahanovich <mahatma@eu.by>
---
diff -pruN a/drivers/video/via/via-core.c b/drivers/video/via/via-core.c
--- a/drivers/video/via/via-core.c 2010-11-22 13:11:44.000000000 +0200
+++ b/drivers/video/via/via-core.c 2010-11-23 00:37:14.000000000 +0200
@@ -2,6 +2,7 @@
* Copyright 1998-2009 VIA Technologies, Inc. All Rights Reserved.
* Copyright 2001-2008 S3 Graphics, Inc. All Rights Reserved.
* Copyright 2009 Jonathan Corbet <corbet@lwn.net>
+ * Copyright 2010 Dzianis Kahanovich <mahatma@eu.by>
*/

/*
@@ -16,6 +17,8 @@
#include <linux/interrupt.h>
#include <linux/platform_device.h>

+extern char *viafb_active_dev;
+
/*
* The default port config.
*/
@@ -576,6 +579,56 @@ static void via_teardown_subdevs(void)
}


+static void via_i2c_detect(void)
+{
+ u8 *edid;
+ struct fb_var_screeninfo var;
+ int i, n = 0;
+ struct i2c_adapter *adapter;
+
+ for (i = 0; i < VIAFB_NUM_PORTS; i++) {
+ adapter = viafb_find_i2c_adapter(i);
+ if (!adapter || !adapter->algo_data ||
+ !(edid = fb_ddc_read(adapter)))
+ continue;
+ if (fb_parse_edid(edid, &var))
+ goto free_edid;
+ if (n) {
+ fb_edid_to_monspecs(edid, &viafbinfo1->monspecs);
+ viaparinfo->lvds_setting_info2->lcd_panel_hres =
+ var.xres;
+ viaparinfo->lvds_setting_info2->lcd_panel_vres =
+ var.yres;
+ if (!viafb_active_dev) {
+ viafb_SAMM_ON = STATE_ON;
+ if (viafbinfo1->monspecs.input & FB_DISP_DDI)
+ viafb_LCD2_ON = STATE_ON;
+ }
+ } else {
+ fb_edid_to_monspecs(edid, &viafbinfo->monspecs);
+ viaparinfo->lvds_setting_info->lcd_panel_hres =
+ var.xres;
+ viaparinfo->lvds_setting_info->lcd_panel_vres =
+ var.yres;
+ if (!viafb_active_dev) {
+ viafb_DVI_ON =
+ viaparinfo->tmds_setting_info->
+ max_hres ? STATE_ON : STATE_OFF;
+ if (viafbinfo->monspecs.input & FB_DISP_DDI) {
+ viafb_DeviceStatus = LCD_Device;
+ viafb_primary_dev = LCD_Device;
+ viafb_LCD_ON = STATE_ON;
+ }
+ }
+ }
+ n++;
+free_edid:
+ kfree(edid);
+ if (n > 1)
+ break;
+ }
+}
+
static int __devinit via_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
@@ -607,6 +660,7 @@ static int __devinit via_pci_probe(struc
ret = via_fb_pci_probe(&global_dev);
if (ret)
goto out_subdevs;
+ via_i2c_detect();
return 0;

out_subdevs:
diff -pruN a/drivers/video/via/viafbdev.c b/drivers/video/via/viafbdev.c
--- a/drivers/video/via/viafbdev.c 2010-11-22 13:11:44.000000000 +0200
+++ b/drivers/video/via/viafbdev.c 2010-11-22 13:59:07.000000000 +0200
@@ -43,7 +43,7 @@ static int viafb_second_size;
static int viafb_accel = 1;

/* Added for specifying active devices.*/
-char *viafb_active_dev;
+char *viafb_active_dev = NULL;

/*Added for specify lcd output port*/
char *viafb_lcd_port = "";
diff -pruN a/drivers/video/via/via_i2c.c b/drivers/video/via/via_i2c.c
--- a/drivers/video/via/via_i2c.c 2010-11-22 13:11:44.000000000 +0200
+++ b/drivers/video/via/via_i2c.c 2010-11-23 01:07:20.000000000 +0200
@@ -188,7 +188,7 @@ struct i2c_adapter *viafb_find_i2c_adapt
{
struct via_i2c_stuff *stuff = &via_i2c_par[which];

- return &stuff->adapter;
+ return stuff->is_active ? &stuff->adapter : NULL;
}
EXPORT_SYMBOL_GPL(viafb_find_i2c_adapter);

--
PS Sorry for lamering. Bad webmail, home & bugfix...

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