ACPI: thinkpad-acpi: Remove firmware backlight delays for Intel ACPI IGD OpRegion

Based on analysis and a patch from Matthew Garrett <mjg59@srcf.ucam.org>.

Instruct the ThinkPad ACPI firmware to remove delays on the processing of
backlight brightness changes.  This method is present on ThinkPad
Vista-compatible BIOSes with standard ACPI backlight level control.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Cc: Matthew Garrett <mjg59@srcf.ucam.org>
Cc: Yves-Alexis Perez <corsac@debian.org>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 11 insertions, 0 deletions

diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 4c47f9b80478..17b8281deee5 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -838,6 +838,13 @@ static int parse_strtoul(const char *buf,
         return 0;
 }
 
+static void tpacpi_disable_brightness_delay(void)
+{
+        if (acpi_evalf(hkey_handle, NULL, "PWMS", "qvd", 0))
+                printk(TPACPI_NOTICE
+                        "ACPI backlight control delay disabled\n");
+}
+
 static int __init tpacpi_query_bcl_levels(acpi_handle handle)
 {
         struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
@@ -2139,6 +2146,8 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
         if (!tp_features.hotkey)
                 return 1;
 
+        tpacpi_disable_brightness_delay();
+
         hotkey_dev_attributes = create_attr_set(13, NULL);
         if (!hotkey_dev_attributes)
                 return -ENOMEM;
@@ -2512,6 +2521,8 @@ static void hotkey_suspend(pm_message_t state)
 
 static void hotkey_resume(void)
 {
+        tpacpi_disable_brightness_delay();
+
         if (hotkey_mask_get())
                 printk(TPACPI_ERR
                        "error while trying to read hot key mask "