drm/radeon/dpm: handle bapm on trinity

bapm is a power management feature for handling the
power budget between the CPU and GPU on APUs.  This
patch adds support for enabling or disabling it.
For now disable it by default.  Enabling it properly
requires quite a bit more work and will be addressed
in a separate patch.

This patch fixes hangs on boot on certain trinity
laptops when the system is on battery power.

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

diff --git a/drivers/gpu/drm/radeon/ppsmc.h b/drivers/gpu/drm/radeon/ppsmc.h
index 6828428..5670b82 100644 (file)
--- a/drivers/gpu/drm/radeon/ppsmc.h
+++ b/drivers/gpu/drm/radeon/ppsmc.h
@@ -163,6 +163,8 @@ typedef uint8_t PPSMC_Result;
 #define PPSMC_MSG_VCEPowerON                ((uint32_t) 0x10f)
 #define PPSMC_MSG_DCE_RemoveVoltageAdjustment   ((uint32_t) 0x11d)
 #define PPSMC_MSG_DCE_AllowVoltageAdjustment    ((uint32_t) 0x11e)
+#define PPSMC_MSG_EnableBAPM                ((uint32_t) 0x120)
+#define PPSMC_MSG_DisableBAPM               ((uint32_t) 0x121)
 #define PPSMC_MSG_UVD_DPM_Config            ((uint32_t) 0x124)
 
 

diff --git a/drivers/gpu/drm/radeon/trinity_dpm.c b/drivers/gpu/drm/radeon/trinity_dpm.c
index b07b7b8..b1b5b3f 100644 (file)
--- a/drivers/gpu/drm/radeon/trinity_dpm.c
+++ b/drivers/gpu/drm/radeon/trinity_dpm.c
@@ -1091,6 +1091,7 @@ int trinity_dpm_enable(struct radeon_device *rdev)
        trinity_program_sclk_dpm(rdev);
        trinity_start_dpm(rdev);
        trinity_wait_for_dpm_enabled(rdev);
+       trinity_dpm_bapm_enable(rdev, false);
        trinity_release_mutex(rdev);
 
        if (rdev->irq.installed &&
@@ -1116,6 +1117,7 @@ void trinity_dpm_disable(struct radeon_device *rdev)
                trinity_release_mutex(rdev);
                return;
        }
+       trinity_dpm_bapm_enable(rdev, false);
        trinity_disable_clock_power_gating(rdev);
        sumo_clear_vc(rdev);
        trinity_wait_for_level_0(rdev);

diff --git a/drivers/gpu/drm/radeon/trinity_dpm.h b/drivers/gpu/drm/radeon/trinity_dpm.h
index e82df07..259d9e8 100644 (file)
--- a/drivers/gpu/drm/radeon/trinity_dpm.h
+++ b/drivers/gpu/drm/radeon/trinity_dpm.h
@@ -118,6 +118,7 @@ struct trinity_power_info {
 #define TRINITY_AT_DFLT            30
 
 /* trinity_smc.c */
+int trinity_dpm_bapm_enable(struct radeon_device *rdev, bool enable);
 int trinity_dpm_config(struct radeon_device *rdev, bool enable);
 int trinity_uvd_dpm_config(struct radeon_device *rdev);
 int trinity_dpm_force_state(struct radeon_device *rdev, u32 n);

diff --git a/drivers/gpu/drm/radeon/trinity_smc.c b/drivers/gpu/drm/radeon/trinity_smc.c
index a42d89f..9672bcb 100644 (file)
--- a/drivers/gpu/drm/radeon/trinity_smc.c
+++ b/drivers/gpu/drm/radeon/trinity_smc.c
@@ -56,6 +56,14 @@ static int trinity_notify_message_to_smu(struct radeon_device *rdev, u32 id)
        return 0;
 }
 
+int trinity_dpm_bapm_enable(struct radeon_device *rdev, bool enable)
+{
+       if (enable)
+               return trinity_notify_message_to_smu(rdev, PPSMC_MSG_EnableBAPM);
+       else
+               return trinity_notify_message_to_smu(rdev, PPSMC_MSG_DisableBAPM);
+}
+
 int trinity_dpm_config(struct radeon_device *rdev, bool enable)
 {
        if (enable)