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 related bugfixes.
v3 patch: original viafb_find_i2c_adapt() code is unsafe (nowere used).
v4 patch: viafbinfo1 is not initilalized if !viafb_dual_fb
and may cause problems with dual separated LCD. Now dual & SAMM
code looks safe (will no generate errors).
v5 patch: handle undefined resolution, overhead, cleanup.
Signed-off-by: Dzianis Kahanovich <mahatma@xxxxx>
diff -pruN a/drivers/video/via/via-core.c b/drivers/video/via/via-core.c
--- a/drivers/video/via/via-core.c 2010-12-03 13:44:48.000000000 +0200
+++ b/drivers/video/via/via-core.c 2010-12-03 13:16:14.000000000 +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@xxxxxxx>
+ * Copyright 2010 Dzianis Kahanovich <mahatma@xxxxx>
*/
/*
@@ -559,6 +560,69 @@ static void via_teardown_subdevs(void)
}
}
+static void via_i2c_detect(int stage)
+{
+ u8 *edid;
+ struct fb_var_screeninfo var;
+ int i, n = 0;
+ struct i2c_adapter *adapter;
+ struct lvds_setting_information *inf;
+
+ 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;
+ memset(&var, 0, sizeof(var));
+ if (fb_parse_edid(edid, &var))
+ goto free_edid;
+ if (!stage) {
+ if (n && !viafb_active_dev)
+ viafb_dual_fb = STATE_ON;
+ inf = NULL;
+ } else if (!n || !viafb_LCD_ON) {
+ fb_edid_to_monspecs(edid, &viafbinfo->monspecs);
+ inf = viaparinfo->lvds_setting_info;
+ 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_LCD_ON = STATE_ON;
+ viafb_DeviceStatus = LCD_Device;
+ if (!n)
+ viafb_primary_dev = LCD_Device;
+ }
+ }
+ } else if (viafb_dual_fb) {
+ fb_edid_to_monspecs(edid, &viafbinfo1->monspecs);
+ inf = viaparinfo1->lvds_setting_info;
+ if (!viafb_active_dev &&
+ (viafbinfo1->monspecs.input & FB_DISP_DDI))
+ viafb_LCD2_ON = STATE_ON;
+ } else {
+ fb_edid_to_monspecs(edid, &viafbinfo->monspecs);
+ inf = viaparinfo->lvds_setting_info2;
+ if (!viafb_active_dev &&
+ (viafbinfo->monspecs.input & FB_DISP_DDI))
+ viafb_LCD2_ON = STATE_ON;
+ }
+ if (inf) {
+ if (var.xres)
+ inf->lcd_panel_hres = var.xres;
+ if (var.yres)
+ inf->lcd_panel_vres = var.yres;
+ }
+ n++;
+free_edid:
+ kfree(edid);
+ if (n > 1)
+ break;
+ }
+ if (stage && n && !viafb_active_dev)
+ viafb_set_iga_path();
+}
+
static int __devinit via_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
@@ -585,12 +649,16 @@ static int __devinit via_pci_probe(struc
*/
viafb_int_init();
via_setup_subdevs(&global_dev);
+ /* dual? */
+ via_i2c_detect(0);
/*
* Set up the framebuffer device
*/
ret = via_fb_pci_probe(&global_dev);
if (ret)
goto out_subdevs;
+ /* LCD size & present */
+ via_i2c_detect(1);
return 0;
out_subdevs:
diff -pruN a/drivers/video/via/viafbdev.h b/drivers/video/via/viafbdev.h
--- a/drivers/video/via/viafbdev.h 2010-12-03 13:44:48.000000000 +0200
+++ b/drivers/video/via/viafbdev.h 2010-12-03 13:13:50.000000000 +0200
@@ -88,6 +88,7 @@ extern int viafb_LCD2_ON;
extern int viafb_LCD_ON;
extern int viafb_DVI_ON;
extern int viafb_hotplug;
+extern char *viafb_active_dev;
extern int strict_strtoul(const char *cp, unsigned int base,
unsigned long *res);
diff -pruN a/drivers/video/via/via_i2c.c b/drivers/video/via/via_i2c.c
--- a/drivers/video/via/via_i2c.c 2010-12-03 13:44:48.000000000 +0200
+++ b/drivers/video/via/via_i2c.c 2010-12-03 13:10:26.000000000 +0200
@@ -167,7 +167,7 @@ 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);
--
no patch without bug. (c) & PS:
PS Todo: find where initilized mode (while no) and try to [un]detect CRT too
(stage 3?). CRT plugging unaffected in module init stage on my chip, but CRT
must have own DDC.
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