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toshiba_acpi: Fix regression caused by backlight extra check code

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Bug 86521 uncovered that some TOS6208 devices also return
non zero values on a write call to the backlight method,
thus getting caught and bailed out by the extra check code.

This patch changes the set_lcd_brightness function to its
"original" state by just adapting it to the new function
format.

Signed-off-by: Azael Avalos <coproscefalo@gmail.com>
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
This commit is contained in:
Azael Avalos 2014-11-24 19:29:36 -07:00 committed by Darren Hart
parent 841e11ccdf
commit a39f46df33
1 changed files with 4 additions and 17 deletions
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21
drivers/platform/x86/toshiba_acpi.c
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@ -928,9 +928,7 @@ static int lcd_proc_open(struct inode *inode, struct file *file)
static int set_lcd_brightness(struct toshiba_acpi_dev *dev, int value)
{
u32 in[TCI_WORDS] = { HCI_SET, HCI_LCD_BRIGHTNESS, 0, 0, 0, 0 };
u32 out[TCI_WORDS];
acpi_status status;
u32 hci_result;
if (dev->tr_backlight_supported) {
bool enable = !value;
@ -941,20 +939,9 @@ static int set_lcd_brightness(struct toshiba_acpi_dev *dev, int value)
value--;
}
in[2] = value << HCI_LCD_BRIGHTNESS_SHIFT;
status = tci_raw(dev, in, out);
if (ACPI_FAILURE(status) || out[0] == TOS_FAILURE) {
pr_err("ACPI call to set brightness failed");
return -EIO;
}
/* Extra check for "incomplete" backlight method, where the AML code
* doesn't check for HCI_SET or HCI_GET and returns TOS_SUCCESS,
* the actual brightness, and in some cases the max brightness.
*/
if (out[2] > 0 || out[3] == 0xE000)
return -ENODEV;
return out[0] == TOS_SUCCESS ? 0 : -EIO;
value = value << HCI_LCD_BRIGHTNESS_SHIFT;
hci_result = hci_write1(dev, HCI_LCD_BRIGHTNESS, value);
return hci_result == TOS_SUCCESS ? 0 : -EIO;
}
static int set_lcd_status(struct backlight_device *bd)