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 & safe path to viafb_find_i2c_adapter.
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) {
+ 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 =
+ ...
