drm/radeon/dpm: make sure dc performance level limits are valid (BTC-SI) (v2)

Check to make sure the dc limits are valid before using them.
Some systems may not have a dc limits table.  In that case just
use the ac limits.  This fixes hangs on systems when the power
state is changed when on battery (dc) due to invalid performance
state parameters.

Should fix:
https://bugs.freedesktop.org/show_bug.cgi?id=68708

v2: fix up limits in dpm_init()

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

3 files changed, 18 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/btc_dpm.c b/drivers/gpu/drm/radeon/btc_dpm.c
index 9953e1fbc46d..084e69414fd1 100644
--- a/drivers/gpu/drm/radeon/btc_dpm.c
+++ b/drivers/gpu/drm/radeon/btc_dpm.c
@@ -2699,6 +2699,12 @@ int btc_dpm_init(struct radeon_device *rdev)
         else
                 rdev->pm.dpm.dyn_state.sclk_mclk_delta = 10000;
 
+        /* make sure dc limits are valid */
+        if ((rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc.sclk == 0) ||
+            (rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc.mclk == 0))
+                rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc =
+                        rdev->pm.dpm.dyn_state.max_clock_voltage_on_ac;
+
         return 0;
 }
 
diff --git a/drivers/gpu/drm/radeon/ni_dpm.c b/drivers/gpu/drm/radeon/ni_dpm.c
index 88aa41e341af..f7b625c9e0e9 100644
--- a/drivers/gpu/drm/radeon/ni_dpm.c
+++ b/drivers/gpu/drm/radeon/ni_dpm.c
@@ -4272,6 +4272,12 @@ int ni_dpm_init(struct radeon_device *rdev)
 
         ni_pi->use_power_boost_limit = true;
 
+        /* make sure dc limits are valid */
+        if ((rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc.sclk == 0) ||
+            (rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc.mclk == 0))
+                rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc =
+                        rdev->pm.dpm.dyn_state.max_clock_voltage_on_ac;
+
         return 0;
 }
 
diff --git a/drivers/gpu/drm/radeon/si_dpm.c b/drivers/gpu/drm/radeon/si_dpm.c
index 51966f459094..5be9b4e72350 100644
--- a/drivers/gpu/drm/radeon/si_dpm.c
+++ b/drivers/gpu/drm/radeon/si_dpm.c
@@ -6449,6 +6449,12 @@ int si_dpm_init(struct radeon_device *rdev)
 
         si_initialize_powertune_defaults(rdev);
 
+        /* make sure dc limits are valid */
+        if ((rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc.sclk == 0) ||
+            (rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc.mclk == 0))
+                rdev->pm.dpm.dyn_state.max_clock_voltage_on_dc =
+                        rdev->pm.dpm.dyn_state.max_clock_voltage_on_ac;
+
         return 0;
 }