From fce2bad0ee2666d6a10bfeb634b1021469cc3d79 Mon Sep 17 00:00:00 2001 From: Ben Skeggs Date: Thu, 11 Nov 2010 16:14:56 +1000 Subject: [PATCH] drm/nv50: rework PGPIO IRQ handling and hotplug detection Allows callers to install their own handlers for when a GPIO line changes state (such as for hotplug detect). This also fixes a bug where we weren't acknowledging the GPIO IRQ until after the bottom half had run, causing a severe IRQ storm in some cases. Reviewed-by: Francisco Jerez Signed-off-by: Ben Skeggs --- drivers/gpu/drm/nouveau/nouveau_connector.c | 54 +++++- drivers/gpu/drm/nouveau/nouveau_dp.c | 6 +- drivers/gpu/drm/nouveau/nouveau_drv.h | 21 ++- drivers/gpu/drm/nouveau/nouveau_state.c | 4 + drivers/gpu/drm/nouveau/nv50_display.c | 66 ------- drivers/gpu/drm/nouveau/nv50_display.h | 1 - drivers/gpu/drm/nouveau/nv50_gpio.c | 186 ++++++++++++++++++-- 7 files changed, 234 insertions(+), 104 deletions(-) diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c index 52c356e9a3d1..a21e00076839 100644 --- a/drivers/gpu/drm/nouveau/nouveau_connector.c +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c @@ -37,6 +37,8 @@ #include "nouveau_connector.h" #include "nouveau_hw.h" +static void nouveau_connector_hotplug(void *, int); + static struct nouveau_encoder * find_encoder_by_type(struct drm_connector *connector, int type) { @@ -94,22 +96,30 @@ nouveau_connector_bpp(struct drm_connector *connector) } static void -nouveau_connector_destroy(struct drm_connector *drm_connector) +nouveau_connector_destroy(struct drm_connector *connector) { - struct nouveau_connector *nv_connector = - nouveau_connector(drm_connector); + struct nouveau_connector *nv_connector = nouveau_connector(connector); + struct drm_nouveau_private *dev_priv; + struct nouveau_gpio_engine *pgpio; struct drm_device *dev; if (!nv_connector) return; dev = nv_connector->base.dev; + dev_priv = dev->dev_private; NV_DEBUG_KMS(dev, "\n"); + pgpio = &dev_priv->engine.gpio; + if (pgpio->irq_unregister) { + pgpio->irq_unregister(dev, nv_connector->dcb->gpio_tag, + nouveau_connector_hotplug, connector); + } + kfree(nv_connector->edid); - drm_sysfs_connector_remove(drm_connector); - drm_connector_cleanup(drm_connector); - kfree(drm_connector); + drm_sysfs_connector_remove(connector); + drm_connector_cleanup(connector); + kfree(connector); } static struct nouveau_i2c_chan * @@ -760,6 +770,7 @@ nouveau_connector_create(struct drm_device *dev, int index) { const struct drm_connector_funcs *funcs = &nouveau_connector_funcs; struct drm_nouveau_private *dev_priv = dev->dev_private; + struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio; struct nouveau_connector *nv_connector = NULL; struct dcb_connector_table_entry *dcb = NULL; struct drm_connector *connector; @@ -876,6 +887,11 @@ nouveau_connector_create(struct drm_device *dev, int index) break; } + if (pgpio->irq_register) { + pgpio->irq_register(dev, nv_connector->dcb->gpio_tag, + nouveau_connector_hotplug, connector); + } + drm_sysfs_connector_add(connector); dcb->drm = connector; return dcb->drm; @@ -886,3 +902,29 @@ fail: return ERR_PTR(ret); } + +static void +nouveau_connector_hotplug(void *data, int plugged) +{ + struct drm_connector *connector = data; + struct drm_device *dev = connector->dev; + + NV_INFO(dev, "%splugged %s\n", plugged ? "" : "un", + drm_get_connector_name(connector)); + + if (connector->encoder && connector->encoder->crtc && + connector->encoder->crtc->enabled) { + struct nouveau_encoder *nv_encoder = nouveau_encoder(connector->encoder); + struct drm_encoder_helper_funcs *helper = + connector->encoder->helper_private; + + if (nv_encoder->dcb->type == OUTPUT_DP) { + if (plugged) + helper->dpms(connector->encoder, DRM_MODE_DPMS_ON); + else + helper->dpms(connector->encoder, DRM_MODE_DPMS_OFF); + } + } + + drm_helper_hpd_irq_event(dev); +} diff --git a/drivers/gpu/drm/nouveau/nouveau_dp.c b/drivers/gpu/drm/nouveau/nouveau_dp.c index 4562f309ae3d..38d599554bce 100644 --- a/drivers/gpu/drm/nouveau/nouveau_dp.c +++ b/drivers/gpu/drm/nouveau/nouveau_dp.c @@ -279,7 +279,7 @@ nouveau_dp_link_train(struct drm_encoder *encoder) struct bit_displayport_encoder_table *dpe; int dpe_headerlen; uint8_t config[4], status[3]; - bool cr_done, cr_max_vs, eq_done; + bool cr_done, cr_max_vs, eq_done, hpd_state; int ret = 0, i, tries, voltage; NV_DEBUG_KMS(dev, "link training!!\n"); @@ -297,7 +297,7 @@ nouveau_dp_link_train(struct drm_encoder *encoder) /* disable hotplug detect, this flips around on some panels during * link training. */ - pgpio->irq_enable(dev, nv_connector->dcb->gpio_tag, false); + hpd_state = pgpio->irq_enable(dev, nv_connector->dcb->gpio_tag, false); if (dpe->script0) { NV_DEBUG_KMS(dev, "SOR-%d: running DP script 0\n", nv_encoder->or); @@ -439,7 +439,7 @@ stop: } /* re-enable hotplug detect */ - pgpio->irq_enable(dev, nv_connector->dcb->gpio_tag, true); + pgpio->irq_enable(dev, nv_connector->dcb->gpio_tag, hpd_state); return eq_done; } diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h index b19ef7fbb9dd..912c9f785222 100644 --- a/drivers/gpu/drm/nouveau/nouveau_drv.h +++ b/drivers/gpu/drm/nouveau/nouveau_drv.h @@ -376,13 +376,19 @@ struct nouveau_display_engine { }; struct nouveau_gpio_engine { + void *priv; + int (*init)(struct drm_device *); void (*takedown)(struct drm_device *); int (*get)(struct drm_device *, enum dcb_gpio_tag); int (*set)(struct drm_device *, enum dcb_gpio_tag, int state); - void (*irq_enable)(struct drm_device *, enum dcb_gpio_tag, bool on); + int (*irq_register)(struct drm_device *, enum dcb_gpio_tag, + void (*)(void *, int), void *); + void (*irq_unregister)(struct drm_device *, enum dcb_gpio_tag, + void (*)(void *, int), void *); + bool (*irq_enable)(struct drm_device *, enum dcb_gpio_tag, bool on); }; struct nouveau_pm_voltage_level { @@ -619,13 +625,6 @@ struct drm_nouveau_private { bool msi_enabled; struct workqueue_struct *wq; struct work_struct irq_work; - struct work_struct hpd_work; - - struct { - spinlock_t lock; - uint32_t hpd0_bits; - uint32_t hpd1_bits; - } hpd_state; struct list_head vbl_waiting; @@ -1366,7 +1365,11 @@ int nv50_gpio_init(struct drm_device *dev); void nv50_gpio_fini(struct drm_device *dev); int nv50_gpio_get(struct drm_device *dev, enum dcb_gpio_tag tag); int nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state); -void nv50_gpio_irq_enable(struct drm_device *, enum dcb_gpio_tag, bool on); +int nv50_gpio_irq_register(struct drm_device *, enum dcb_gpio_tag, + void (*)(void *, int), void *); +void nv50_gpio_irq_unregister(struct drm_device *, enum dcb_gpio_tag, + void (*)(void *, int), void *); +bool nv50_gpio_irq_enable(struct drm_device *, enum dcb_gpio_tag, bool on); /* nv50_calc. */ int nv50_calc_pll(struct drm_device *, struct pll_lims *, int clk, diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c index 262545b58d96..b26b34c419cb 100644 --- a/drivers/gpu/drm/nouveau/nouveau_state.c +++ b/drivers/gpu/drm/nouveau/nouveau_state.c @@ -396,6 +396,8 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev) engine->gpio.takedown = nv50_gpio_fini; engine->gpio.get = nv50_gpio_get; engine->gpio.set = nv50_gpio_set; + engine->gpio.irq_register = nv50_gpio_irq_register; + engine->gpio.irq_unregister = nv50_gpio_irq_unregister; engine->gpio.irq_enable = nv50_gpio_irq_enable; switch (dev_priv->chipset) { case 0x84: @@ -487,6 +489,8 @@ static int nouveau_init_engine_ptrs(struct drm_device *dev) engine->gpio.takedown = nouveau_stub_takedown; engine->gpio.get = nv50_gpio_get; engine->gpio.set = nv50_gpio_set; + engine->gpio.irq_register = nv50_gpio_irq_register; + engine->gpio.irq_unregister = nv50_gpio_irq_unregister; engine->gpio.irq_enable = nv50_gpio_irq_enable; engine->crypt.init = nouveau_stub_init; engine->crypt.takedown = nouveau_stub_takedown; diff --git a/drivers/gpu/drm/nouveau/nv50_display.c b/drivers/gpu/drm/nouveau/nv50_display.c index e5dbd171672c..7cc94ed9ed95 100644 --- a/drivers/gpu/drm/nouveau/nv50_display.c +++ b/drivers/gpu/drm/nouveau/nv50_display.c @@ -804,71 +804,6 @@ nv50_display_error_handler(struct drm_device *dev) } } -void -nv50_display_irq_hotplug_bh(struct work_struct *work) -{ - struct drm_nouveau_private *dev_priv = - container_of(work, struct drm_nouveau_private, hpd_work); - struct drm_device *dev = dev_priv->dev; - struct drm_connector *connector; - const uint32_t gpio_reg[4] = { 0xe104, 0xe108, 0xe280, 0xe284 }; - uint32_t unplug_mask, plug_mask, change_mask; - uint32_t hpd0, hpd1; - - spin_lock_irq(&dev_priv->hpd_state.lock); - hpd0 = dev_priv->hpd_state.hpd0_bits; - dev_priv->hpd_state.hpd0_bits = 0; - hpd1 = dev_priv->hpd_state.hpd1_bits; - dev_priv->hpd_state.hpd1_bits = 0; - spin_unlock_irq(&dev_priv->hpd_state.lock); - - hpd0 &= nv_rd32(dev, 0xe050); - if (dev_priv->chipset >= 0x90) - hpd1 &= nv_rd32(dev, 0xe070); - - plug_mask = (hpd0 & 0x0000ffff) | (hpd1 << 16); - unplug_mask = (hpd0 >> 16) | (hpd1 & 0xffff0000); - change_mask = plug_mask | unplug_mask; - - list_for_each_entry(connector, &dev->mode_config.connector_list, head) { - struct drm_encoder_helper_funcs *helper; - struct nouveau_connector *nv_connector = - nouveau_connector(connector); - struct nouveau_encoder *nv_encoder; - struct dcb_gpio_entry *gpio; - uint32_t reg; - bool plugged; - - if (!nv_connector->dcb) - continue; - - gpio = nouveau_bios_gpio_entry(dev, nv_connector->dcb->gpio_tag); - if (!gpio || !(change_mask & (1 << gpio->line))) - continue; - - reg = nv_rd32(dev, gpio_reg[gpio->line >> 3]); - plugged = !!(reg & (4 << ((gpio->line & 7) << 2))); - NV_INFO(dev, "%splugged %s\n", plugged ? "" : "un", - drm_get_connector_name(connector)) ; - - if (!connector->encoder || !connector->encoder->crtc || - !connector->encoder->crtc->enabled) - continue; - nv_encoder = nouveau_encoder(connector->encoder); - helper = connector->encoder->helper_private; - - if (nv_encoder->dcb->type != OUTPUT_DP) - continue; - - if (plugged) - helper->dpms(connector->encoder, DRM_MODE_DPMS_ON); - else - helper->dpms(connector->encoder, DRM_MODE_DPMS_OFF); - } - - drm_helper_hpd_irq_event(dev); -} - static void nv50_display_isr(struct drm_device *dev) { @@ -918,4 +853,3 @@ nv50_display_isr(struct drm_device *dev) } } } - diff --git a/drivers/gpu/drm/nouveau/nv50_display.h b/drivers/gpu/drm/nouveau/nv50_display.h index a269fccf3555..f0e30b78ef6b 100644 --- a/drivers/gpu/drm/nouveau/nv50_display.h +++ b/drivers/gpu/drm/nouveau/nv50_display.h @@ -36,7 +36,6 @@ #include "nv50_evo.h" void nv50_display_irq_handler_bh(struct work_struct *work); -void nv50_display_irq_hotplug_bh(struct work_struct *work); int nv50_display_early_init(struct drm_device *dev); void nv50_display_late_takedown(struct drm_device *dev); int nv50_display_create(struct drm_device *dev); diff --git a/drivers/gpu/drm/nouveau/nv50_gpio.c b/drivers/gpu/drm/nouveau/nv50_gpio.c index 87266d1b5def..6b149c0cc06d 100644 --- a/drivers/gpu/drm/nouveau/nv50_gpio.c +++ b/drivers/gpu/drm/nouveau/nv50_gpio.c @@ -29,6 +29,24 @@ #include "nv50_display.h" static void nv50_gpio_isr(struct drm_device *dev); +static void nv50_gpio_isr_bh(struct work_struct *work); + +struct nv50_gpio_priv { + struct list_head handlers; + spinlock_t lock; +}; + +struct nv50_gpio_handler { + struct drm_device *dev; + struct list_head head; + struct work_struct work; + bool inhibit; + + struct dcb_gpio_entry *gpio; + + void (*handler)(void *data, int state); + void *data; +}; static int nv50_gpio_location(struct dcb_gpio_entry *gpio, uint32_t *reg, uint32_t *shift) @@ -79,29 +97,123 @@ nv50_gpio_set(struct drm_device *dev, enum dcb_gpio_tag tag, int state) return 0; } +int +nv50_gpio_irq_register(struct drm_device *dev, enum dcb_gpio_tag tag, + void (*handler)(void *, int), void *data) +{ + struct drm_nouveau_private *dev_priv = dev->dev_private; + struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio; + struct nv50_gpio_priv *priv = pgpio->priv; + struct nv50_gpio_handler *gpioh; + struct dcb_gpio_entry *gpio; + unsigned long flags; + + gpio = nouveau_bios_gpio_entry(dev, tag); + if (!gpio) + return -ENOENT; + + gpioh = kzalloc(sizeof(*gpioh), GFP_KERNEL); + if (!gpioh) + return -ENOMEM; + + INIT_WORK(&gpioh->work, nv50_gpio_isr_bh); + gpioh->dev = dev; + gpioh->gpio = gpio; + gpioh->handler = handler; + gpioh->data = data; + + spin_lock_irqsave(&priv->lock, flags); + list_add(&gpioh->head, &priv->handlers); + spin_unlock_irqrestore(&priv->lock, flags); + return 0; +} + void -nv50_gpio_irq_enable(struct drm_device *dev, enum dcb_gpio_tag tag, bool on) +nv50_gpio_irq_unregister(struct drm_device *dev, enum dcb_gpio_tag tag, + void (*handler)(void *, int), void *data) { + struct drm_nouveau_private *dev_priv = dev->dev_private; + struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio; + struct nv50_gpio_priv *priv = pgpio->priv; + struct nv50_gpio_handler *gpioh, *tmp; struct dcb_gpio_entry *gpio; - u32 reg, mask; + unsigned long flags; gpio = nouveau_bios_gpio_entry(dev, tag); - if (!gpio) { - NV_ERROR(dev, "gpio tag 0x%02x not found\n", tag); + if (!gpio) return; + + spin_lock_irqsave(&priv->lock, flags); + list_for_each_entry_safe(gpioh, tmp, &priv->handlers, head) { + if (gpioh->gpio != gpio || + gpioh->handler != handler || + gpioh->data != data) + continue; + list_del(&gpioh->head); + kfree(gpioh); } + spin_unlock_irqrestore(&priv->lock, flags); +} + +bool +nv50_gpio_irq_enable(struct drm_device *dev, enum dcb_gpio_tag tag, bool on) +{ + struct dcb_gpio_entry *gpio; + u32 reg, mask; + + gpio = nouveau_bios_gpio_entry(dev, tag); + if (!gpio) + return false; reg = gpio->line < 16 ? 0xe050 : 0xe070; mask = 0x00010001 << (gpio->line & 0xf); nv_wr32(dev, reg + 4, mask); - nv_mask(dev, reg + 0, mask, on ? mask : 0); + reg = nv_mask(dev, reg + 0, mask, on ? mask : 0); + return (reg & mask) == mask; +} + +static int +nv50_gpio_create(struct drm_device *dev) +{ + struct drm_nouveau_private *dev_priv = dev->dev_private; + struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio; + struct nv50_gpio_priv *priv; + + priv = kzalloc(sizeof(*priv), GFP_KERNEL); + if (!priv) + return -ENOMEM; + + INIT_LIST_HEAD(&priv->handlers); + spin_lock_init(&priv->lock); + pgpio->priv = priv; + return 0; +} + +static void +nv50_gpio_destroy(struct drm_device *dev) +{ + struct drm_nouveau_private *dev_priv = dev->dev_private; + struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio; + + kfree(pgpio->priv); + pgpio->priv = NULL; } int nv50_gpio_init(struct drm_device *dev) { struct drm_nouveau_private *dev_priv = dev->dev_private; + struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio; + struct nv50_gpio_priv *priv; + int ret; + + if (!pgpio->priv) { + ret = nv50_gpio_create(dev); + if (ret) + return ret; + } + priv = pgpio->priv; /* disable, and ack any pending gpio interrupts */ nv_wr32(dev, 0xe050, 0x00000000); @@ -111,8 +223,6 @@ nv50_gpio_init(struct drm_device *dev) nv_wr32(dev, 0xe074, 0xffffffff); } - INIT_WORK(&dev_priv->hpd_work, nv50_display_irq_hotplug_bh); - spin_lock_init(&dev_priv->hpd_state.lock); nouveau_irq_register(dev, 21, nv50_gpio_isr); return 0; } @@ -126,26 +236,64 @@ nv50_gpio_fini(struct drm_device *dev) if (dev_priv->chipset >= 0x90) nv_wr32(dev, 0xe070, 0x00000000); nouveau_irq_unregister(dev, 21); + + nv50_gpio_destroy(dev); +} + +static void +nv50_gpio_isr_bh(struct work_struct *work) +{ + struct nv50_gpio_handler *gpioh = + container_of(work, struct nv50_gpio_handler, work); + struct drm_nouveau_private *dev_priv = gpioh->dev->dev_private; + struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio; + struct nv50_gpio_priv *priv = pgpio->priv; + unsigned long flags; + int state; + + state = pgpio->get(gpioh->dev, gpioh->gpio->tag); + if (state < 0) + return; + + gpioh->handler(gpioh->data, state); + + spin_lock_irqsave(&priv->lock, flags); + gpioh->inhibit = false; + spin_unlock_irqrestore(&priv->lock, flags); } static void nv50_gpio_isr(struct drm_device *dev) { struct drm_nouveau_private *dev_priv = dev->dev_private; - uint32_t hpd0_bits, hpd1_bits = 0; + struct nouveau_gpio_engine *pgpio = &dev_priv->engine.gpio; + struct nv50_gpio_priv *priv = pgpio->priv; + struct nv50_gpio_handler *gpioh; + u32 intr0, intr1 = 0; + u32 hi, lo, ch; - hpd0_bits = nv_rd32(dev, 0xe054); - nv_wr32(dev, 0xe054, hpd0_bits); + intr0 = nv_rd32(dev, 0xe054) & nv_rd32(dev, 0xe050); + if (dev_priv->chipset >= 0x90) + intr1 = nv_rd32(dev, 0xe074) & nv_rd32(dev, 0xe070); - if (dev_priv->chipset >= 0x90) { - hpd1_bits = nv_rd32(dev, 0xe074); - nv_wr32(dev, 0xe074, hpd1_bits); - } + hi = (intr0 & 0x0000ffff) | (intr1 << 16); + lo = (intr0 >> 16) | (intr1 & 0xffff0000); + ch = hi | lo; - spin_lock(&dev_priv->hpd_state.lock); - dev_priv->hpd_state.hpd0_bits |= hpd0_bits; - dev_priv->hpd_state.hpd1_bits |= hpd1_bits; - spin_unlock(&dev_priv->hpd_state.lock); + nv_wr32(dev, 0xe054, intr0); + if (dev_priv->chipset >= 0x90) + nv_wr32(dev, 0xe074, intr1); + + spin_lock(&priv->lock); + list_for_each_entry(gpioh, &priv->handlers, head) { + if (!(ch & (1 << gpioh->gpio->line))) + continue; - queue_work(dev_priv->wq, &dev_priv->hpd_work); + if (gpioh->inhibit) + continue; + gpioh->inhibit = true; + + queue_work(dev_priv->wq, &gpioh->work); + } + spin_unlock(&priv->lock); } -- 2.20.1