drm/radeon: fix runpm handling on APUs (v4)

Don't try and runtime suspend the APU in PX systems.  We
only want to power down the dGPU.

v2: fix harder
v3: fix stupid typo
v4: consolidate runpm enablement to a single flag

bugs:
https://bugs.freedesktop.org/show_bug.cgi?id=75127
https://bugzilla.kernel.org/show_bug.cgi?id=72701

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

6 files changed, 27 insertions, 34 deletions

diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h
index f21db7a0b34d..7014bdd688ce 100644
--- a/drivers/gpu/drm/radeon/radeon.h
+++ b/drivers/gpu/drm/radeon/radeon.h
@@ -2321,6 +2321,7 @@ struct radeon_device {
         bool have_disp_power_ref;
 };
 
+bool radeon_is_px(struct drm_device *dev);
 int radeon_device_init(struct radeon_device *rdev,
                        struct drm_device *ddev,
                        struct pci_dev *pdev,
diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
index fa9a9c02751e..dedea72f48c4 100644
--- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c
+++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
@@ -59,7 +59,7 @@ struct atpx_mux {
         u16 mux;
 } __packed;
 
-bool radeon_is_px(void) {
+bool radeon_has_atpx(void) {
         return radeon_atpx_priv.atpx_detected;
 }
 
diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 835516d2d257..511fe26198e4 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c
@@ -102,11 +102,14 @@ static const char radeon_family_name[][16] = {
         "LAST",
 };
 
-#if defined(CONFIG_VGA_SWITCHEROO)
-bool radeon_is_px(void);
-#else
-static inline bool radeon_is_px(void) { return false; }
-#endif
+bool radeon_is_px(struct drm_device *dev)
+{
+        struct radeon_device *rdev = dev->dev_private;
+
+        if (rdev->flags & RADEON_IS_PX)
+                return true;
+        return false;
+}
 
 /**
  * radeon_program_register_sequence - program an array of registers.
@@ -1082,7 +1085,7 @@ static void radeon_switcheroo_set_state(struct pci_dev *pdev, enum vga_switchero
 {
         struct drm_device *dev = pci_get_drvdata(pdev);
 
-        if (radeon_is_px() && state == VGA_SWITCHEROO_OFF)
+        if (radeon_is_px(dev) && state == VGA_SWITCHEROO_OFF)
                 return;
 
         if (state == VGA_SWITCHEROO_ON) {
@@ -1301,9 +1304,7 @@ int radeon_device_init(struct radeon_device *rdev,
          * ignore it */
         vga_client_register(rdev->pdev, rdev, NULL, radeon_vga_set_decode);
 
-        if (radeon_runtime_pm == 1)
-                runtime = true;
-        if ((radeon_runtime_pm == -1) && radeon_is_px())
+        if (rdev->flags & RADEON_IS_PX)
                 runtime = true;
         vga_switcheroo_register_client(rdev->pdev, &radeon_switcheroo_ops, runtime);
         if (runtime)
diff --git a/drivers/gpu/drm/radeon/radeon_drv.c b/drivers/gpu/drm/radeon/radeon_drv.c
index d0eba48dd74e..25127ba44ed9 100644
--- a/drivers/gpu/drm/radeon/radeon_drv.c
+++ b/drivers/gpu/drm/radeon/radeon_drv.c
@@ -115,6 +115,7 @@ extern int radeon_get_crtc_scanoutpos(struct drm_device *dev, int crtc,
                                       unsigned int flags,
                                       int *vpos, int *hpos, ktime_t *stime,
                                       ktime_t *etime);
+extern bool radeon_is_px(struct drm_device *dev);
 extern const struct drm_ioctl_desc radeon_ioctls_kms[];
 extern int radeon_max_kms_ioctl;
 int radeon_mmap(struct file *filp, struct vm_area_struct *vma);
@@ -144,11 +145,9 @@ void radeon_debugfs_cleanup(struct drm_minor *minor);
 #if defined(CONFIG_VGA_SWITCHEROO)
 void radeon_register_atpx_handler(void);
 void radeon_unregister_atpx_handler(void);
-bool radeon_is_px(void);
 #else
 static inline void radeon_register_atpx_handler(void) {}
 static inline void radeon_unregister_atpx_handler(void) {}
-static inline bool radeon_is_px(void) { return false; }
 #endif
 
 int radeon_no_wb;
@@ -405,12 +404,7 @@ static int radeon_pmops_runtime_suspend(struct device *dev)
         struct drm_device *drm_dev = pci_get_drvdata(pdev);
         int ret;
 
-        if (radeon_runtime_pm == 0) {
-                pm_runtime_forbid(dev);
-                return -EBUSY;
-        }
-
-        if (radeon_runtime_pm == -1 && !radeon_is_px()) {
+        if (!radeon_is_px(drm_dev)) {
                 pm_runtime_forbid(dev);
                 return -EBUSY;
         }
@@ -434,10 +428,7 @@ static int radeon_pmops_runtime_resume(struct device *dev)
         struct drm_device *drm_dev = pci_get_drvdata(pdev);
         int ret;
 
-        if (radeon_runtime_pm == 0)
-                return -EINVAL;
-
-        if (radeon_runtime_pm == -1 && !radeon_is_px())
+        if (!radeon_is_px(drm_dev))
                 return -EINVAL;
 
         drm_dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;
@@ -462,14 +453,7 @@ static int radeon_pmops_runtime_idle(struct device *dev)
         struct drm_device *drm_dev = pci_get_drvdata(pdev);
         struct drm_crtc *crtc;
 
-        if (radeon_runtime_pm == 0) {
-                pm_runtime_forbid(dev);
-                return -EBUSY;
-        }
-
-        /* are we PX enabled? */
-        if (radeon_runtime_pm == -1 && !radeon_is_px()) {
-                DRM_DEBUG_DRIVER("failing to power off - not px\n");
+        if (!radeon_is_px(drm_dev)) {
                 pm_runtime_forbid(dev);
                 return -EBUSY;
         }
diff --git a/drivers/gpu/drm/radeon/radeon_family.h b/drivers/gpu/drm/radeon/radeon_family.h
index 614ad549297f..9da5da4ffd17 100644
--- a/drivers/gpu/drm/radeon/radeon_family.h
+++ b/drivers/gpu/drm/radeon/radeon_family.h
@@ -115,6 +115,7 @@ enum radeon_chip_flags {
         RADEON_NEW_MEMMAP = 0x00400000UL,
         RADEON_IS_PCI = 0x00800000UL,
         RADEON_IS_IGPGART = 0x01000000UL,
+        RADEON_IS_PX = 0x02000000UL,
 };
 
 #endif
diff --git a/drivers/gpu/drm/radeon/radeon_kms.c b/drivers/gpu/drm/radeon/radeon_kms.c
index 3e49342a20e6..9337820e4d37 100644
--- a/drivers/gpu/drm/radeon/radeon_kms.c
+++ b/drivers/gpu/drm/radeon/radeon_kms.c
@@ -35,9 +35,9 @@
 #include <linux/pm_runtime.h>
 
 #if defined(CONFIG_VGA_SWITCHEROO)
-bool radeon_is_px(void);
+bool radeon_has_atpx(void);
 #else
-static inline bool radeon_is_px(void) { return false; }
+static inline bool radeon_has_atpx(void) { return false; }
 #endif
 
 /**
@@ -107,6 +107,13 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
                 flags |= RADEON_IS_PCI;
         }
 
+        if (radeon_runtime_pm == 1)
+                flags |= RADEON_IS_PX;
+        else if ((radeon_runtime_pm == -1) &&
+                 radeon_has_atpx() &&
+                 ((flags & RADEON_IS_IGP) == 0))
+                flags |= RADEON_IS_PX;
+
         /* radeon_device_init should report only fatal error
          * like memory allocation failure or iomapping failure,
          * or memory manager initialization failure, it must
@@ -137,8 +144,7 @@ int radeon_driver_load_kms(struct drm_device *dev, unsigned long flags)
                                 "Error during ACPI methods call\n");
         }
 
-        if ((radeon_runtime_pm == 1) ||
-            ((radeon_runtime_pm == -1) && radeon_is_px())) {
+        if (radeon_is_px(dev)) {
                 pm_runtime_use_autosuspend(dev->dev);
                 pm_runtime_set_autosuspend_delay(dev->dev, 5000);
                 pm_runtime_set_active(dev->dev);