[PATCH 5.19 174/207] drm/gma500: Fix (vblank) IRQs not working after suspend/resume

Greg Kroah-Hartman
2022-09-26T12:02:37Z

From: Hans de Goede <hdegoede@redhat.com>

[ Upstream commit 235fdbc32d559db21e580f85035c59372704f09e ]

Fix gnome-shell (and other page-flip users) hanging after suspend/resume
because of the gma500's IRQs not working.

This fixes 2 problems with the IRQ handling:

1. gma_power_off() calls gma_irq_uninstall() which does a free_irq(), but
gma_power_on() called gma_irq_preinstall() + gma_irq_postinstall() which
do not call request_irq. Replace the pre- + post-install calls with
gma_irq_install() which does prep + request + post.

2. After fixing 1. IRQs still do not work on a Packard Bell Dot SC (Intel
Atom N2600, cedarview) netbook.

Cederview uses MSI interrupts and it seems that the BIOS re-configures
things back to normal APIC based interrupts during S3 suspend. There is
some MSI PCI-config registers save/restore code which tries to deal with
this, but on the Packard Bell Dot SC this is not sufficient to restore
MSI IRQ functionality after a suspend/resume.

Replace the PCI-config registers save/restore with pci_disable_msi() on
suspend + pci_enable_msi() on resume. Fixing e.g. gnome-shell hanging.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220906203852.527663-4-hdegoede@redhat.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/gma500/cdv_device.c | 4 +---
drivers/gpu/drm/gma500/oaktrail_device.c | 5 +----
drivers/gpu/drm/gma500/power.c | 8 +-------
drivers/gpu/drm/gma500/psb_drv.c | 2 +-
drivers/gpu/drm/gma500/psb_drv.h | 5 +----
drivers/gpu/drm/gma500/psb_irq.c | 15 ++++++++++++---
drivers/gpu/drm/gma500/psb_irq.h | 2 +-
7 files changed, 18 insertions(+), 23 deletions(-)

diff --git a/drivers/gpu/drm/gma500/cdv_device.c b/drivers/gpu/drm/gma500/cdv_device.c
index dd32b484dd82..ce96234f3df2 100644
--- a/drivers/gpu/drm/gma500/cdv_device.c
+++ b/drivers/gpu/drm/gma500/cdv_device.c
@@ -581,11 +581,9 @@ static const struct psb_offset cdv_regmap[2] = {
static int cdv_chip_setup(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
- struct pci_dev *pdev = to_pci_dev(dev->dev);
INIT_WORK(&dev_priv->hotplug_work, cdv_hotplug_work_func);

- if (pci_enable_msi(pdev))
- dev_warn(dev->dev, "Enabling MSI failed!\n");
+ dev_priv->use_msi = true;
dev_priv->regmap = cdv_regmap;
gma_get_core_freq(dev);
psb_intel_opregion_init(dev);
diff --git a/drivers/gpu/drm/gma500/oaktrail_device.c b/drivers/gpu/drm/gma500/oaktrail_device.c
index 5923a9c89312..f90e628cb482 100644
--- a/drivers/gpu/drm/gma500/oaktrail_device.c
+++ b/drivers/gpu/drm/gma500/oaktrail_device.c
@@ -501,12 +501,9 @@ static const struct psb_offset oaktrail_regmap[2] = {
static int oaktrail_chip_setup(struct drm_device *dev)
{
struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
- struct pci_dev *pdev = to_pci_dev(dev->dev);
int ret;

- if (pci_enable_msi(pdev))
- dev_warn(dev->dev, "Enabling MSI failed!\n");
-
+ dev_priv->use_msi = true;
dev_priv->regmap = oaktrail_regmap;

ret = mid_chip_setup(dev);
diff --git a/drivers/gpu/drm/gma500/power.c b/drivers/gpu/drm/gma500/power.c
index b91de6d36e41..66873085d450 100644
--- a/drivers/gpu/drm/gma500/power.c
+++ b/drivers/gpu/drm/gma500/power.c
@@ -139,8 +139,6 @@ static void gma_suspend_pci(struct pci_dev *pdev)
dev_priv->regs.saveBSM = bsm;
pci_read_config_dword(pdev, 0xFC, &vbt);
dev_priv->regs.saveVBT = vbt;
- pci_read_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, &dev_priv->msi_addr);
- pci_read_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, &dev_priv->msi_data);

pci_disable_device(pdev);
pci_set_power_state(pdev, PCI_D3hot);
@@ -168,9 +166,6 @@ static bool gma_resume_pci(struct pci_dev *pdev)
pci_restore_state(pdev);
pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM);
pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT);
- /* restoring MSI address and data in PCIx space */
- pci_write_config_dword(pdev, PSB_PCIx_MSI_ADDR_LOC, dev_priv->msi_addr);
- pci_write_config_dword(pdev, PSB_PCIx_MSI_DATA_LOC, dev_priv->msi_data);
ret = pci_enable_device(pdev);

if (ret != 0)
@@ -223,8 +218,7 @@ int gma_power_resume(struct device *_dev)
mutex_lock(&power_mutex);
gma_resume_pci(pdev);
gma_resume_display(pdev);
- gma_irq_preinstall(dev);
- gma_irq_postinstall(dev);
+ gma_irq_install(dev);
mutex_unlock(&power_mutex);
return 0;
}
diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c
index 1d8744f3e702..54e756b48606 100644
--- a/drivers/gpu/drm/gma500/psb_drv.c
+++ b/drivers/gpu/drm/gma500/psb_drv.c
@@ -383,7 +383,7 @@ static int psb_driver_load(struct drm_device *dev, unsigned long flags)
PSB_WVDC32(0xFFFFFFFF, PSB_INT_MASK_R);
spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);

- gma_irq_install(dev, pdev->irq);
+ gma_irq_install(dev);

dev->max_vblank_count = 0xffffff; /* only 24 bits of frame count */

diff --git a/drivers/gpu/drm/gma500/psb_drv.h b/drivers/gpu/drm/gma500/psb_drv.h
index 0ddfec1a0851..4c3fc5eaf6ad 100644
--- a/drivers/gpu/drm/gma500/psb_drv.h
+++ b/drivers/gpu/drm/gma500/psb_drv.h
@@ -490,6 +490,7 @@ struct drm_psb_private {
int rpm_enabled;

/* MID specific */
+ bool use_msi;
bool has_gct;
struct oaktrail_gct_data gct_data;

@@ -499,10 +500,6 @@ struct drm_psb_private {
/* Register state */
struct psb_save_area regs;

- /* MSI reg save */
- uint32_t msi_addr;
- uint32_t msi_data;
-
/* Hotplug handling */
struct work_struct hotplug_work;

diff --git a/drivers/gpu/drm/gma500/psb_irq.c b/drivers/gpu/drm/gma500/psb_irq.c
index e6e6d61bbeab..038f18ed0a95 100644
--- a/drivers/gpu/drm/gma500/psb_irq.c
+++ b/drivers/gpu/drm/gma500/psb_irq.c
@@ -316,17 +316,24 @@ void gma_irq_postinstall(struct drm_device *dev)
spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);
}

-int gma_irq_install(struct drm_device *dev, unsigned int irq)
+int gma_irq_install(struct drm_device *dev)
{
+ struct drm_psb_private *dev_priv = to_drm_psb_private(dev);
+ struct pci_dev *pdev = to_pci_dev(dev->dev);
int ret;

- if (irq == IRQ_NOTCONNECTED)
+ if (dev_priv->use_msi && pci_enable_msi(pdev)) {
+ dev_warn(dev->dev, "Enabling MSI failed!\n");
+ dev_priv->use_msi = false;
+ }
+
+ if (pdev->irq == IRQ_NOTCONNECTED)
return -ENOTCONN;

gma_irq_preinstall(dev);

/* PCI devices require shared interrupts. */
- ret = request_irq(irq, gma_irq_handler, IRQF_SHARED, dev->driver->name, dev);
+ ret = request_irq(pdev->irq, gma_irq_handler, IRQF_SHARED, dev->driver->name, dev);
if (ret)
return ret;

@@ -369,6 +376,8 @@ void gma_irq_uninstall(struct drm_device *dev)
spin_unlock_irqrestore(&dev_priv->irqmask_lock, irqflags);

free_irq(pdev->irq, dev);
+ if (dev_priv->use_msi)
+ pci_disable_msi(pdev);
}

int gma_crtc_enable_vblank(struct drm_crtc *crtc)
diff --git a/drivers/gpu/drm/gma500/psb_irq.h b/drivers/gpu/drm/gma500/psb_irq.h
index b51e395194ff..7648f69824a5 100644
--- a/drivers/gpu/drm/gma500/psb_irq.h
+++ b/drivers/gpu/drm/gma500/psb_irq.h
@@ -17,7 +17,7 @@ struct drm_device;

void gma_irq_preinstall(struct drm_device *dev);
void gma_irq_postinstall(struct drm_device *dev);
-int gma_irq_install(struct drm_device *dev, unsigned int irq);
+int gma_irq_install(struct drm_device *dev);
void gma_irq_uninstall(struct drm_device *dev);

int gma_crtc_enable_vblank(struct drm_crtc *crtc);
--
2.35.1