drm/radeon/kms: accept slightly overclocked power modes

Fixes fdo bug #26329

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Tested-by: Tobias Jakobi <liquid.acid@gmx.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/radeon/radeon.h

@@ -662,6 +662,11 @@ struct radeon_power_state {
 	bool voltage_drop_active;
 };
 
+/*
+ * Some modes are overclocked by very low value, accept them
+ */
+#define RADEON_MODE_OVERCLOCK_MARGIN 500 /* 5 MHz */
+
 struct radeon_pm {
 	struct mutex		mutex;
 	struct delayed_work	idle_work;

drivers/gpu/drm/radeon/radeon_atombios.c

@@ -1463,9 +1463,9 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
 						continue;
 					/* skip overclock modes for now */
 					if ((rdev->pm.power_state[state_index].clock_info[0].mclk >
-					     rdev->clock.default_mclk) ||
+					     rdev->clock.default_mclk + RADEON_MODE_OVERCLOCK_MARGIN) ||
 					    (rdev->pm.power_state[state_index].clock_info[0].sclk >
-					     rdev->clock.default_sclk))
+					     rdev->clock.default_sclk + RADEON_MODE_OVERCLOCK_MARGIN))
 						continue;
 					rdev->pm.power_state[state_index].non_clock_info.pcie_lanes =
 						power_info->info.asPowerPlayInfo[i].ucNumPciELanes;
@@ -1528,9 +1528,9 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
 						continue;
 					/* skip overclock modes for now */
 					if ((rdev->pm.power_state[state_index].clock_info[0].mclk >
-					     rdev->clock.default_mclk) ||
+					     rdev->clock.default_mclk + RADEON_MODE_OVERCLOCK_MARGIN) ||
 					    (rdev->pm.power_state[state_index].clock_info[0].sclk >
-					     rdev->clock.default_sclk))
+					     rdev->clock.default_sclk + RADEON_MODE_OVERCLOCK_MARGIN))
 						continue;
 					rdev->pm.power_state[state_index].non_clock_info.pcie_lanes =
 						power_info->info_2.asPowerPlayInfo[i].ucNumPciELanes;
@@ -1597,9 +1597,9 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
 						continue;
 					/* skip overclock modes for now */
 					if ((rdev->pm.power_state[state_index].clock_info[0].mclk >
-					     rdev->clock.default_mclk) ||
+					     rdev->clock.default_mclk + RADEON_MODE_OVERCLOCK_MARGIN) ||
 					    (rdev->pm.power_state[state_index].clock_info[0].sclk >
-					     rdev->clock.default_sclk))
+					     rdev->clock.default_sclk + RADEON_MODE_OVERCLOCK_MARGIN))
 						continue;
 					rdev->pm.power_state[state_index].non_clock_info.pcie_lanes =
 						power_info->info_3.asPowerPlayInfo[i].ucNumPciELanes;
@@ -1693,7 +1693,7 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
 							continue;
 						/* skip overclock modes for now */
 						if (rdev->pm.power_state[state_index].clock_info[mode_index].sclk >
-						    rdev->clock.default_sclk)
+						    rdev->clock.default_sclk + RADEON_MODE_OVERCLOCK_MARGIN)
 							continue;
 						rdev->pm.power_state[state_index].clock_info[mode_index].voltage.type =
 							VOLTAGE_SW;
@@ -1720,9 +1720,9 @@ void radeon_atombios_get_power_modes(struct radeon_device *rdev)
 							continue;
 						/* skip overclock modes for now */
 						if ((rdev->pm.power_state[state_index].clock_info[mode_index].mclk >
-						     rdev->clock.default_mclk) ||
+						     rdev->clock.default_mclk + RADEON_MODE_OVERCLOCK_MARGIN) ||
 						    (rdev->pm.power_state[state_index].clock_info[mode_index].sclk >
-						     rdev->clock.default_sclk))
+						     rdev->clock.default_sclk + RADEON_MODE_OVERCLOCK_MARGIN))
 							continue;
 						rdev->pm.power_state[state_index].clock_info[mode_index].voltage.type =
 							VOLTAGE_SW;

drivers/gpu/drm/radeon/radeon_combios.c

@@ -2374,9 +2374,9 @@ void radeon_combios_get_power_modes(struct radeon_device *rdev)
 				goto default_mode;
 			/* skip overclock modes for now */
 			if ((rdev->pm.power_state[state_index].clock_info[0].mclk >
-			     rdev->clock.default_mclk) ||
+			     rdev->clock.default_mclk + RADEON_MODE_OVERCLOCK_MARGIN) ||
 			    (rdev->pm.power_state[state_index].clock_info[0].sclk >
-			     rdev->clock.default_sclk))
+			     rdev->clock.default_sclk + RADEON_MODE_OVERCLOCK_MARGIN))
 				goto default_mode;
 			rdev->pm.power_state[state_index].type =
 				POWER_STATE_TYPE_BATTERY;