OMAP: board-files: fix i2c_bus for tfp410

commit ca2e16faa7378878c1522a7c1b6c38211de3331d upstream.

The i2c handling in tfp410 driver, which handles converting parallel RGB
to DVI, was changed in 958f2717b84e88bf833d996997fda8f73276f2af
(OMAPDSS: TFP410: pdata rewrite). The patch changed what value the
driver considers as invalid/undefined.  Before the patch, 0 was the
invalid value, but as 0 is a valid bus number, the patch changed this to
-1.

However, the fact was missed that many board files do not define the bus
number at all, thus it's left to 0. This causes the driver to fail to
get the i2c bus, exiting from the driver's probe with an error, meaning
that the DVI output does not work for those boards.

This patch fixes the issue by changing the i2c_bus number field in the
driver's platform data from u16 to int, and setting the bus number to -1
in the board files for the boards that did not define the bus. The
exception is devkit8000, for which the bus is set to 1, which is the
correct bus for that board.

The bug exists in v3.5+ kernels.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reported-by: Thomas Weber <thomas@tomweber.eu>
Cc: Thomas Weber <thomas@tomweber.eu>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

6 files changed, 6 insertions, 0 deletions

diff --git a/arch/arm/mach-omap2/board-3430sdp.c b/arch/arm/mach-omap2/board-3430sdp.c
index 96cd3693e1ae..09e1790f80ae 100644
--- a/arch/arm/mach-omap2/board-3430sdp.c
+++ b/arch/arm/mach-omap2/board-3430sdp.c
@@ -157,6 +157,7 @@ static struct omap_dss_device sdp3430_lcd_device = {
 
 static struct tfp410_platform_data dvi_panel = {
 	.power_down_gpio	= -1,
+	.i2c_bus_num		= -1,
 };
 
 static struct omap_dss_device sdp3430_dvi_device = {
diff --git a/arch/arm/mach-omap2/board-am3517evm.c b/arch/arm/mach-omap2/board-am3517evm.c
index e16289755f2e..f2a920a60263 100644
--- a/arch/arm/mach-omap2/board-am3517evm.c
+++ b/arch/arm/mach-omap2/board-am3517evm.c
@@ -208,6 +208,7 @@ static struct omap_dss_device am3517_evm_tv_device = {
 
 static struct tfp410_platform_data dvi_panel = {
 	.power_down_gpio	= -1,
+	.i2c_bus_num		= -1,
 };
 
 static struct omap_dss_device am3517_evm_dvi_device = {
diff --git a/arch/arm/mach-omap2/board-cm-t35.c b/arch/arm/mach-omap2/board-cm-t35.c
index 376d26eb601c..7ed0270048f1 100644
--- a/arch/arm/mach-omap2/board-cm-t35.c
+++ b/arch/arm/mach-omap2/board-cm-t35.c
@@ -243,6 +243,7 @@ static struct omap_dss_device cm_t35_lcd_device = {
 
 static struct tfp410_platform_data dvi_panel = {
 	.power_down_gpio	= CM_T35_DVI_EN_GPIO,
+	.i2c_bus_num		= -1,
 };
 
 static struct omap_dss_device cm_t35_dvi_device = {
diff --git a/arch/arm/mach-omap2/board-devkit8000.c b/arch/arm/mach-omap2/board-devkit8000.c
index 1fd161e934c7..6f04f0f319e9 100644
--- a/arch/arm/mach-omap2/board-devkit8000.c
+++ b/arch/arm/mach-omap2/board-devkit8000.c
@@ -139,6 +139,7 @@ static struct omap_dss_device devkit8000_lcd_device = {
 
 static struct tfp410_platform_data dvi_panel = {
 	.power_down_gpio	= -1,
+	.i2c_bus_num		= 1,
 };
 
 static struct omap_dss_device devkit8000_dvi_device = {
diff --git a/arch/arm/mach-omap2/board-omap3evm.c b/arch/arm/mach-omap2/board-omap3evm.c
index b9b776b6c954..5631eb91d74b 100644
--- a/arch/arm/mach-omap2/board-omap3evm.c
+++ b/arch/arm/mach-omap2/board-omap3evm.c
@@ -236,6 +236,7 @@ static struct omap_dss_device omap3_evm_tv_device = {
 
 static struct tfp410_platform_data dvi_panel = {
 	.power_down_gpio	= OMAP3EVM_DVI_PANEL_EN_GPIO,
+	.i2c_bus_num		= -1,
 };
 
 static struct omap_dss_device omap3_evm_dvi_device = {
diff --git a/arch/arm/mach-omap2/board-omap3stalker.c b/arch/arm/mach-omap2/board-omap3stalker.c
index 731235eb319e..797be2221ab5 100644
--- a/arch/arm/mach-omap2/board-omap3stalker.c
+++ b/arch/arm/mach-omap2/board-omap3stalker.c
@@ -119,6 +119,7 @@ static struct omap_dss_device omap3_stalker_tv_device = {
 
 static struct tfp410_platform_data dvi_panel = {
 	.power_down_gpio	= DSS_ENABLE_GPIO,
+	.i2c_bus_num		= -1,
 };
 
 static struct omap_dss_device omap3_stalker_dvi_device = {