drm/radeon/kms: enable misc pm power state features on r5xx, rs6xx

voltage drop, dynamic voltage, dynamic sclk, pcie lane adjust, etc,

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 12 insertions, 4 deletions

diff --git a/drivers/gpu/drm/radeon/rs600.c b/drivers/gpu/drm/radeon/rs600.c
index c3890b76a1c0..8e0c46060b3a 100644
--- a/drivers/gpu/drm/radeon/rs600.c
+++ b/drivers/gpu/drm/radeon/rs600.c
@@ -48,12 +48,11 @@ int rs600_mc_wait_for_idle(struct radeon_device *rdev);
 
 void rs600_pm_misc(struct radeon_device *rdev)
 {
-#if 0
         int requested_index = rdev->pm.requested_power_state_index;
         struct radeon_power_state *ps = &rdev->pm.power_state[requested_index];
         struct radeon_voltage *voltage = &ps->clock_info[0].voltage;
         u32 tmp, dyn_pwrmgt_sclk_length, dyn_sclk_vol_cntl;
-        u32 hdp_dyn_cntl, mc_host_dyn_cntl;
+        u32 hdp_dyn_cntl, /*mc_host_dyn_cntl,*/ dyn_backbias_cntl;
 
         if ((voltage->type == VOLTAGE_GPIO) && (voltage->gpio.valid)) {
                 if (ps->misc & ATOM_PM_MISCINFO_VOLTAGE_DROP_SUPPORT) {
@@ -112,13 +111,21 @@ void rs600_pm_misc(struct radeon_device *rdev)
         else
                 hdp_dyn_cntl |= HDP_FORCEON;
         WREG32_PLL(HDP_DYN_CNTL, hdp_dyn_cntl);
-
+#if 0
+        /* mc_host_dyn seems to cause hangs from time to time */
         mc_host_dyn_cntl = RREG32_PLL(MC_HOST_DYN_CNTL);
         if (ps->misc & ATOM_PM_MISCINFO_DYNAMIC_MC_HOST_BLOCK_EN)
                 mc_host_dyn_cntl &= ~MC_HOST_FORCEON;
         else
                 mc_host_dyn_cntl |= MC_HOST_FORCEON;
         WREG32_PLL(MC_HOST_DYN_CNTL, mc_host_dyn_cntl);
+#endif
+        dyn_backbias_cntl = RREG32_PLL(DYN_BACKBIAS_CNTL);
+        if (ps->misc & ATOM_PM_MISCINFO2_DYNAMIC_BACK_BIAS_EN)
+                dyn_backbias_cntl |= IO_CG_BACKBIAS_EN;
+        else
+                dyn_backbias_cntl &= ~IO_CG_BACKBIAS_EN;
+        WREG32_PLL(DYN_BACKBIAS_CNTL, dyn_backbias_cntl);
 
         /* set pcie lanes */
         if ((rdev->flags & RADEON_IS_PCIE) &&
@@ -130,7 +137,6 @@ void rs600_pm_misc(struct radeon_device *rdev)
                                       ps->pcie_lanes);
                 DRM_INFO("Setting: p: %d\n", ps->pcie_lanes);
         }
-#endif
 }
 
 void rs600_pm_prepare(struct radeon_device *rdev)
diff --git a/drivers/gpu/drm/radeon/rs600d.h b/drivers/gpu/drm/radeon/rs600d.h
index 8f624342927a..a27c13ac47c3 100644
--- a/drivers/gpu/drm/radeon/rs600d.h
+++ b/drivers/gpu/drm/radeon/rs600d.h
@@ -655,6 +655,8 @@
 #define   HDP_FORCEON                                  (1 << 0)
 #define MC_HOST_DYN_CNTL                               0x1e
 #define   MC_HOST_FORCEON                              (1 << 0)
+#define DYN_BACKBIAS_CNTL                              0x29
+#define   IO_CG_BACKBIAS_EN                            (1 << 0)
 
 /* mmreg */
 #define DOUT_POWER_MANAGEMENT_CNTL                     0x7ee0