diff options
author | Hans de Goede <hdegoede@redhat.com> | 2022-09-09 14:56:45 +0300 |
---|---|---|
committer | Hans de Goede <hdegoede@redhat.com> | 2022-09-17 16:20:40 +0300 |
commit | 672c473576ca5c9f5a40ac848c938e6898a5aac8 (patch) | |
tree | b52e49ec624c543f86548ea1b5f2791707d86fa3 /drivers | |
parent | d35a4bf66079b92e232ac85b08f19312be9b7eca (diff) | |
download | linux-672c473576ca5c9f5a40ac848c938e6898a5aac8.tar.xz |
drm/gma500: Rewrite power management code
Rewrite the power.c code. For some reason this was doing locking +
refcounting + state (suspended or not) bookkeeping all by itself.
But there is no reason for this, this is all taken care of by
the runtime-pm core, through pm_runtime_get()/_put().
Besides this not being necessary the DIY code is also quite weird/
buggy in some places. E.g. power_begin() would manually do a resume
when not resumed already and force_on=true, followed by a
pm_runtime_get(), which will cause a call to gma_power_resume() to
get scheduled which would redo the entire resume again. Which can
all be replaced by a single pm_runtime_get_sync() call.
Note that this is just a cleanup, this does not actually fix
the (disabled through #if 0) runtime-pm support. It does now call
pm_runtime_enable(), but only after doing a pm_runtime_get() at
probe-time, so the device is never runtime suspended.
Doing this permanent get() + enable() instead of not calling
enable() at all is necessary for the pm_runtime_get_if_in_use() call
in gma_power_begin() to work properly.
Note this also removes the gma_power_is_on() call a check like this
without actually holding a reference is always racy, so it is a bad
idea (and therefor has no pm_runtime_foo() equivalent).
The 2 code paths which were using gma_power_is_on() are actually both
guaranteed to only run when the device is powered-on so the 2 checks
can simply be dropped.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220909115646.99920-6-hdegoede@redhat.com
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/gpu/drm/gma500/oaktrail_lvds.c | 1 | ||||
-rw-r--r-- | drivers/gpu/drm/gma500/power.c | 133 | ||||
-rw-r--r-- | drivers/gpu/drm/gma500/power.h | 9 | ||||
-rw-r--r-- | drivers/gpu/drm/gma500/psb_drv.c | 6 | ||||
-rw-r--r-- | drivers/gpu/drm/gma500/psb_drv.h | 4 | ||||
-rw-r--r-- | drivers/gpu/drm/gma500/psb_irq.c | 15 |
6 files changed, 38 insertions, 130 deletions
diff --git a/drivers/gpu/drm/gma500/oaktrail_lvds.c b/drivers/gpu/drm/gma500/oaktrail_lvds.c index 4d98df189e10..75b4eb1c8884 100644 --- a/drivers/gpu/drm/gma500/oaktrail_lvds.c +++ b/drivers/gpu/drm/gma500/oaktrail_lvds.c @@ -61,7 +61,6 @@ static void oaktrail_lvds_set_power(struct drm_device *dev, pp_status = REG_READ(PP_STATUS); } while (pp_status & PP_ON); dev_priv->is_lvds_on = false; - pm_request_idle(dev->dev); } gma_power_end(dev); } diff --git a/drivers/gpu/drm/gma500/power.c b/drivers/gpu/drm/gma500/power.c index 66873085d450..af09e0d680d9 100644 --- a/drivers/gpu/drm/gma500/power.c +++ b/drivers/gpu/drm/gma500/power.c @@ -37,9 +37,6 @@ #include <linux/mutex.h> #include <linux/pm_runtime.h> -static struct mutex power_mutex; /* Serialize power ops */ -static DEFINE_SPINLOCK(power_ctrl_lock); /* Serialize power claim */ - /** * gma_power_init - initialise power manager * @dev: our device @@ -54,13 +51,23 @@ void gma_power_init(struct drm_device *dev) dev_priv->apm_base = dev_priv->apm_reg & 0xffff; dev_priv->ospm_base &= 0xffff; - dev_priv->display_power = true; /* We start active */ - dev_priv->display_count = 0; /* Currently no users */ - dev_priv->suspended = false; /* And not suspended */ - mutex_init(&power_mutex); - if (dev_priv->ops->init_pm) dev_priv->ops->init_pm(dev); + + /* + * Runtime pm support is broken atm. So for now unconditionally + * call pm_runtime_get() here and put it again in psb_driver_unload() + * + * To fix this we need to call pm_runtime_get() once for each active + * pipe at boot and then put() / get() for each pipe disable / enable + * so that the device gets runtime suspended when no pipes are active. + * Once this is in place the pm_runtime_get() below should be replaced + * by a pm_runtime_allow() call to undo the pm_runtime_forbid() from + * pci_pm_init(). + */ + pm_runtime_get(dev->dev); + + dev_priv->pm_initialized = true; } /** @@ -71,8 +78,12 @@ void gma_power_init(struct drm_device *dev) */ void gma_power_uninit(struct drm_device *dev) { - pm_runtime_disable(dev->dev); - pm_runtime_set_suspended(dev->dev); + struct drm_psb_private *dev_priv = to_drm_psb_private(dev); + + if (!dev_priv->pm_initialized) + return; + + pm_runtime_put_noidle(dev->dev); } /** @@ -85,11 +96,8 @@ static void gma_suspend_display(struct drm_device *dev) { struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - if (dev_priv->suspended) - return; dev_priv->ops->save_regs(dev); dev_priv->ops->power_down(dev); - dev_priv->display_power = false; } /** @@ -106,8 +114,6 @@ static void gma_resume_display(struct pci_dev *pdev) /* turn on the display power island */ dev_priv->ops->power_up(dev); - dev_priv->suspended = false; - dev_priv->display_power = true; PSB_WVDC32(dev_priv->pge_ctl | _PSB_PGETBL_ENABLED, PSB_PGETBL_CTL); pci_write_config_word(pdev, PSB_GMCH_CTRL, @@ -131,9 +137,6 @@ static void gma_suspend_pci(struct pci_dev *pdev) struct drm_psb_private *dev_priv = to_drm_psb_private(dev); int bsm, vbt; - if (dev_priv->suspended) - return; - pci_save_state(pdev); pci_read_config_dword(pdev, 0x5C, &bsm); dev_priv->regs.saveBSM = bsm; @@ -142,8 +145,6 @@ static void gma_suspend_pci(struct pci_dev *pdev) pci_disable_device(pdev); pci_set_power_state(pdev, PCI_D3hot); - - dev_priv->suspended = true; } /** @@ -153,26 +154,17 @@ static void gma_suspend_pci(struct pci_dev *pdev) * Perform the resume processing on our PCI device state - rewrite * register state and re-enable the PCI device */ -static bool gma_resume_pci(struct pci_dev *pdev) +static int gma_resume_pci(struct pci_dev *pdev) { struct drm_device *dev = pci_get_drvdata(pdev); struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - int ret; - - if (!dev_priv->suspended) - return true; pci_set_power_state(pdev, PCI_D0); pci_restore_state(pdev); pci_write_config_dword(pdev, 0x5c, dev_priv->regs.saveBSM); pci_write_config_dword(pdev, 0xFC, dev_priv->regs.saveVBT); - ret = pci_enable_device(pdev); - if (ret != 0) - dev_err(&pdev->dev, "pci_enable failed: %d\n", ret); - else - dev_priv->suspended = false; - return !dev_priv->suspended; + return pci_enable_device(pdev); } /** @@ -187,20 +179,10 @@ int gma_power_suspend(struct device *_dev) { struct pci_dev *pdev = to_pci_dev(_dev); struct drm_device *dev = pci_get_drvdata(pdev); - struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - mutex_lock(&power_mutex); - if (!dev_priv->suspended) { - if (dev_priv->display_count) { - mutex_unlock(&power_mutex); - dev_err(dev->dev, "GPU hardware busy, cannot suspend\n"); - return -EBUSY; - } - gma_irq_uninstall(dev); - gma_suspend_display(dev); - gma_suspend_pci(pdev); - } - mutex_unlock(&power_mutex); + gma_irq_uninstall(dev); + gma_suspend_display(dev); + gma_suspend_pci(pdev); return 0; } @@ -215,27 +197,13 @@ int gma_power_resume(struct device *_dev) struct pci_dev *pdev = to_pci_dev(_dev); struct drm_device *dev = pci_get_drvdata(pdev); - mutex_lock(&power_mutex); gma_resume_pci(pdev); gma_resume_display(pdev); gma_irq_install(dev); - mutex_unlock(&power_mutex); return 0; } /** - * gma_power_is_on - returne true if power is on - * @dev: our DRM device - * - * Returns true if the display island power is on at this moment - */ -bool gma_power_is_on(struct drm_device *dev) -{ - struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - return dev_priv->display_power; -} - -/** * gma_power_begin - begin requiring power * @dev: our DRM device * @force_on: true to force power on @@ -245,35 +213,10 @@ bool gma_power_is_on(struct drm_device *dev) */ bool gma_power_begin(struct drm_device *dev, bool force_on) { - struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - struct pci_dev *pdev = to_pci_dev(dev->dev); - int ret; - unsigned long flags; - - spin_lock_irqsave(&power_ctrl_lock, flags); - /* Power already on ? */ - if (dev_priv->display_power) { - dev_priv->display_count++; - pm_runtime_get(dev->dev); - spin_unlock_irqrestore(&power_ctrl_lock, flags); - return true; - } - if (force_on == false) - goto out_false; - - /* Ok power up needed */ - ret = gma_resume_pci(pdev); - if (ret == 0) { - gma_irq_preinstall(dev); - gma_irq_postinstall(dev); - pm_runtime_get(dev->dev); - dev_priv->display_count++; - spin_unlock_irqrestore(&power_ctrl_lock, flags); - return true; - } -out_false: - spin_unlock_irqrestore(&power_ctrl_lock, flags); - return false; + if (force_on) + return pm_runtime_resume_and_get(dev->dev) == 0; + else + return pm_runtime_get_if_in_use(dev->dev) == 1; } /** @@ -285,12 +228,6 @@ out_false: */ void gma_power_end(struct drm_device *dev) { - struct drm_psb_private *dev_priv = to_drm_psb_private(dev); - unsigned long flags; - spin_lock_irqsave(&power_ctrl_lock, flags); - dev_priv->display_count--; - WARN_ON(dev_priv->display_count < 0); - spin_unlock_irqrestore(&power_ctrl_lock, flags); pm_runtime_put(dev->dev); } @@ -304,16 +241,6 @@ int psb_runtime_resume(struct device *dev) return gma_power_resume(dev); } -int psb_runtime_idle(struct device *dev) -{ - struct drm_device *drmdev = pci_get_drvdata(to_pci_dev(dev)); - struct drm_psb_private *dev_priv = to_drm_psb_private(drmdev); - if (dev_priv->display_count) - return 0; - else - return 1; -} - int gma_power_thaw(struct device *_dev) { return gma_power_resume(_dev); diff --git a/drivers/gpu/drm/gma500/power.h b/drivers/gpu/drm/gma500/power.h index 0c89c4d6ec20..243b9dd00910 100644 --- a/drivers/gpu/drm/gma500/power.h +++ b/drivers/gpu/drm/gma500/power.h @@ -55,18 +55,9 @@ bool gma_power_begin(struct drm_device *dev, bool force); void gma_power_end(struct drm_device *dev); /* - * Use this function to do an instantaneous check for if the hw is on. - * Only use this in cases where you know the mutex is already held such - * as in irq install/uninstall and you need to - * prevent a deadlock situation. Otherwise use gma_power_begin(). - */ -bool gma_power_is_on(struct drm_device *dev); - -/* * GFX-Runtime PM callbacks */ int psb_runtime_suspend(struct device *dev); int psb_runtime_resume(struct device *dev); -int psb_runtime_idle(struct device *dev); #endif /*_PSB_POWERMGMT_H_*/ diff --git a/drivers/gpu/drm/gma500/psb_drv.c b/drivers/gpu/drm/gma500/psb_drv.c index 8266371aeac1..aea8876059d8 100644 --- a/drivers/gpu/drm/gma500/psb_drv.c +++ b/drivers/gpu/drm/gma500/psb_drv.c @@ -407,11 +407,6 @@ static int psb_driver_load(struct drm_device *dev, unsigned long flags) if (ret) return ret; psb_intel_opregion_enable_asle(dev); -#if 0 - /* Enable runtime pm at last */ - pm_runtime_enable(dev->dev); - pm_runtime_set_active(dev->dev); -#endif return devm_add_action_or_reset(dev->dev, psb_device_release, dev); @@ -484,7 +479,6 @@ static const struct dev_pm_ops psb_pm_ops = { .restore = gma_power_restore, .runtime_suspend = psb_runtime_suspend, .runtime_resume = psb_runtime_resume, - .runtime_idle = psb_runtime_idle, }; static const struct file_operations psb_gem_fops = { diff --git a/drivers/gpu/drm/gma500/psb_drv.h b/drivers/gpu/drm/gma500/psb_drv.h index dd6fd49d85f3..049701ce8a5f 100644 --- a/drivers/gpu/drm/gma500/psb_drv.h +++ b/drivers/gpu/drm/gma500/psb_drv.h @@ -426,9 +426,7 @@ struct drm_psb_private { spinlock_t irqmask_lock; /* Power */ - bool suspended; - bool display_power; - int display_count; + bool pm_initialized; /* Modesetting */ struct psb_intel_mode_device mode_dev; diff --git a/drivers/gpu/drm/gma500/psb_irq.c b/drivers/gpu/drm/gma500/psb_irq.c index 038f18ed0a95..d421031462df 100644 --- a/drivers/gpu/drm/gma500/psb_irq.c +++ b/drivers/gpu/drm/gma500/psb_irq.c @@ -228,7 +228,7 @@ static irqreturn_t gma_irq_handler(int irq, void *arg) vdc_stat &= dev_priv->vdc_irq_mask; spin_unlock(&dev_priv->irqmask_lock); - if (dsp_int && gma_power_is_on(dev)) { + if (dsp_int) { gma_vdc_interrupt(dev, vdc_stat); handled = 1; } @@ -264,13 +264,12 @@ void gma_irq_preinstall(struct drm_device *dev) spin_lock_irqsave(&dev_priv->irqmask_lock, irqflags); - if (gma_power_is_on(dev)) { - PSB_WVDC32(0xFFFFFFFF, PSB_HWSTAM); - PSB_WVDC32(0x00000000, PSB_INT_MASK_R); - PSB_WVDC32(0x00000000, PSB_INT_ENABLE_R); - PSB_WSGX32(0x00000000, PSB_CR_EVENT_HOST_ENABLE); - PSB_RSGX32(PSB_CR_EVENT_HOST_ENABLE); - } + PSB_WVDC32(0xFFFFFFFF, PSB_HWSTAM); + PSB_WVDC32(0x00000000, PSB_INT_MASK_R); + PSB_WVDC32(0x00000000, PSB_INT_ENABLE_R); + PSB_WSGX32(0x00000000, PSB_CR_EVENT_HOST_ENABLE); + PSB_RSGX32(PSB_CR_EVENT_HOST_ENABLE); + if (dev->vblank[0].enabled) dev_priv->vdc_irq_mask |= _PSB_VSYNC_PIPEA_FLAG; if (dev->vblank[1].enabled) |