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

[ Upstream commit bfaddd9fc8ac048b99475f000dbef6f08297417f ]

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

Cc: stable@vger.kernel.org
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>

diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
index 1523cf94bcdc6d151b4cf67c40ea5339f62464c1..8bc7d0bbd3c80a94529cea79bf4f078d7951a87a 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 eb5f88aa76abd6cae30b65269179b8d150d49bcd..5d54ab0fbe2bdfd50262de4a2c8101c66c825231 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)
 
@@ -1401,7 +1395,7 @@ 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)