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

Some PX laptops don't provide an ACPI method to control dGPU power.  On
those systems, the driver is responsible for handling the dGPU power
state.  Disable runtime PM on them until support for this is implemented.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Alex Deucher 2016-03-02 11:47:29 -05:00
parent 92821c261d
commit e64c952efb
2 changed files with 11 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpu/drm/radeon/radeon_atpx_handler.c
View File

@ -62,6 +62,10 @@ 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
*
@ -141,10 +145,6 @@ 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;

8
drivers/gpu/drm/radeon/radeon_device.c
View File

@ -103,6 +103,12 @@ 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)
@ -1433,7 +1439,7 @@ 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)
if ((rdev->flags & RADEON_IS_PX) && radeon_has_atpx_dgpu_power_cntl())
runtime = true;
vga_switcheroo_register_client(rdev->pdev, &radeon_switcheroo_ops, runtime);
if (runtime)