Revert "drm/radeon: disable runtime pm on PX laptops without dGPU power control"

commit bfaddd9fc8ac048b99475f000dbef6f08297417f upstream.

This reverts commit e64c952efb8e0c15ae82cec8e455ab4910690ef1.

ATPX is the ACPI method for controlling AMD PowerXpress laptops.
There are flags to indicate which methods are supported.  If
the dGPU power down flag is not supported, the driver needs to
implement the dGPU power down manually.  We had previously
always forced the driver to assume the ATPX dGPU power down
was present, but this causes problems on boards where it is
not, leading to GPU hangs when attempting to power down the
dGPU.  Manual dGPU power down is not currently supported in
the Linux driver.  Some laptops indicate that the ATPX
dGPU power down method is not present, but it actually
apparently is.  I'm not sure if this is a bios bug and it should
be set or if there is a reason it was unset and the method should
not be used.  This is not an issue on other OSes since both the
ATPX and the manual driver power down methods are supported.

This is apparently fairly widespread, so just revert for now.

bugs:
https://bugzilla.kernel.org/show_bug.cgi?id=115321
https://bugzilla.kernel.org/show_bug.cgi?id=116581
https://bugzilla.kernel.org/show_bug.cgi?id=116251

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
index 9bc408c9f9f628874d9b4d6b7db8d48838d5096c..c4b4f298a2831a2ca3723bebe3ef8834bc6a6f3c 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c
+++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
@@ -62,10 +62,6 @@ bool radeon_has_atpx(void) {
        return radeon_atpx_priv.atpx_detected;
 }
 
-bool radeon_has_atpx_dgpu_power_cntl(void) {
-       return radeon_atpx_priv.atpx.functions.power_cntl;
-}
-
 /**
  * radeon_atpx_call - call an ATPX method
  *
@@ -145,6 +141,10 @@ static void radeon_atpx_parse_functions(struct radeon_atpx_functions *f, u32 mas
  */
 static int radeon_atpx_validate(struct radeon_atpx *atpx)
 {
+       /* make sure required functions are enabled */
+       /* dGPU power control is required */
+       atpx->functions.power_cntl = true;
+
        if (atpx->functions.px_params) {
                union acpi_object *info;
                struct atpx_px_params output;

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index f78f111e68de114022d87cd48157c5bbf10b4fb2..c566993a2ec3bcbe393ff14d079b0134f0426c7d 100644 (file)
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -103,12 +103,6 @@ static const char radeon_family_name[][16] = {
        "LAST",
 };
 
-#if defined(CONFIG_VGA_SWITCHEROO)
-bool radeon_has_atpx_dgpu_power_cntl(void);
-#else
-static inline bool radeon_has_atpx_dgpu_power_cntl(void) { return false; }
-#endif
-
 #define RADEON_PX_QUIRK_DISABLE_PX  (1 << 0)
 #define RADEON_PX_QUIRK_LONG_WAKEUP (1 << 1)
 
@@ -1439,7 +1433,7 @@ int radeon_device_init(struct radeon_device *rdev,
         * ignore it */
        vga_client_register(rdev->pdev, rdev, NULL, radeon_vga_set_decode);
 
-       if ((rdev->flags & RADEON_IS_PX) && radeon_has_atpx_dgpu_power_cntl())
+       if (rdev->flags & RADEON_IS_PX)
                runtime = true;
        vga_switcheroo_register_client(rdev->pdev, &radeon_switcheroo_ops, runtime);
        if (runtime)