Re: [PATCH v1 2/2] drm/radeon: make MacBook Pro d3_delay quirk more generic

The PCI Power Management Spec, r1.2, sec 5.6.1, requires a 10 millisecond
delay when powering on a device, i.e., transitioning from state D3hot to
D0.

Apparently some devices require more time, and d1f9809ed131 ("drm/radeon:
add quirk for d3 delay during switcheroo poweron for apple macbooks") added
an additional delay for the Radeon device in a MacBook Pro.  4807c5a8a0c8
("drm/radeon: add a PX quirk list") made the affected device more explicit.

Add a generic PCI quirk to increase the d3_delay.  This means we will use
the additional delay for *all* wakeups from D3, not just those initiated by
radeon_switcheroo_set_state().

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: Maarten Lankhorst <redacted>
---
 drivers/gpu/drm/radeon/radeon_device.c |   12 ------------
 drivers/pci/quirks.c                   |   13 +++++++++++++
 2 files changed, 13 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c
index 8a1df2a1afbd..8b8fd981cae5 100644
--- a/drivers/gpu/drm/radeon/radeon_device.c
+++ b/drivers/gpu/drm/radeon/radeon_device.c

@@ -113,7 +113,6 @@ static inline bool radeon_is_atpx_hybrid(void) { return false; }
 #endif

 #define RADEON_PX_QUIRK_DISABLE_PX  (1 << 0)
-#define RADEON_PX_QUIRK_LONG_WAKEUP (1 << 1)

 struct radeon_px_quirk {
        u32 chip_vendor;

@@ -136,9 +135,6 @@ static struct radeon_px_quirk radeon_px_quirk_list[] = {
         * https://bugzilla.kernel.org/show_bug.cgi?id=51381
         */
        { PCI_VENDOR_ID_ATI, 0x6840, 0x1043, 0x2122, RADEON_PX_QUIRK_DISABLE_PX },
-       /* macbook pro 8.2 */
-       { PCI_VENDOR_ID_ATI, 0x6741, PCI_VENDOR_ID_APPLE, 0x00e2, RADEON_PX_QUIRK_LONG_WAKEUP },

 };

 bool radeon_is_px(struct drm_device *dev)

@@ -1241,25 +1237,17 @@ static void radeon_check_arguments(struct radeon_device *rdev)
 static void radeon_switcheroo_set_state(struct pci_dev *pdev, enum vga_switcheroo_state state)
 {
        struct drm_device *dev = pci_get_drvdata(pdev);
-       struct radeon_device *rdev = dev->dev_private;

        if (radeon_is_px(dev) && state == VGA_SWITCHEROO_OFF)
                return;

        if (state == VGA_SWITCHEROO_ON) {
-               unsigned d3_delay = dev->pdev->d3_delay;
-
                printk(KERN_INFO "radeon: switched on\n");
                /* don't suspend or resume card normally */
                dev->switch_power_state = DRM_SWITCH_POWER_CHANGING;

-               if (d3_delay < 20 && (rdev->px_quirk_flags & RADEON_PX_QUIRK_LONG_WAKEUP))
-                       dev->pdev->d3_delay = 20;
-
                radeon_resume_kms(dev, true, true);

-               dev->pdev->d3_delay = d3_delay;
-
                dev->switch_power_state = DRM_SWITCH_POWER_ON;
                drm_kms_helper_poll_enable(dev);
        } else {

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 1800befa8b8b..512d7a875d62 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c

@@ -1683,6 +1683,19 @@ DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,     0x2609, quirk_intel_pcie_pm);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,   0x260a, quirk_intel_pcie_pm);
 DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_INTEL,   0x260b, quirk_intel_pcie_pm);

+static void quirk_radeon_pm(struct pci_dev *dev)
+{
+       if (dev->subsystem_vendor == PCI_VENDOR_ID_APPLE &&
+           dev->subsystem_device == 0x00e2) {
+               if (dev->d3_delay < 20) {
+                       dev->d3_delay = 20;
+                       dev_info(&dev->dev, "extending delay after power-on from D3 to %d msec\n",
+                                dev->d3_delay);
+               }
+       }
+}
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x6741, quirk_radeon_pm);
+
 #ifdef CONFIG_X86_IO_APIC
 /*
  * Boot interrupts on some chipsets cannot be turned off. For these chipsets,

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