On Mon, Jan 27, 2025 at 11:20:24AM +0800, Yongbang Shi wrote:From: Baihan Li <libaihan@xxxxxxxxxx> This is a series of functions about getting dp connector status function, registering irq function, interrupt handler function, and hpd event process function to realize DP HPD feature.Please follow the Documentation/process/submit-checklist.rst. Start with the problem description, then describe what is being done. Also, does it make sense to implement the enable_hpd() and disable_hpd() callbacks for your connector?
Hi Dmitry, Thanks for your advising! I will check and fix this description problem in all the patches. I think our chip comes with this hpd feature, and I can't find a reason why we need to disable it, or is there some place that is useful?
Signed-off-by: Baihan Li <libaihan@xxxxxxxxxx> Signed-off-by: Yongbang Shi <shiyongbang@xxxxxxxxxx> --- .../gpu/drm/hisilicon/hibmc/dp/dp_config.h | 1 + drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c | 30 +++++++ drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h | 2 + drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h | 2 + .../gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c | 61 ++++++++++++++- .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c | 78 +++++++++++++++---- .../gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h | 14 ++++ 7 files changed, 171 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_config.h b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_config.h index c5feef8dc27d..08f9e1caf7fc 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_config.h +++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_config.h @@ -16,5 +16,6 @@ #define HIBMC_DP_SYNC_EN_MASK 0x3 #define HIBMC_DP_LINK_RATE_CAL 27 #define HIBMC_DP_SYNC_DELAY(lanes) ((lanes) == 0x2 ? 86 : 46) +#define HIBMC_DP_INT_ENABLE 0xc#endifdiff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c index 9c8b91ff0e3b..1797b40e54fc 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c +++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.c @@ -181,6 +181,7 @@ int hibmc_dp_hw_init(struct hibmc_dp *dp) /* int init */ writel(0, dp_dev->base + HIBMC_DP_INTR_ENABLE); writel(HIBMC_DP_INT_RST, dp_dev->base + HIBMC_DP_INTR_ORIGINAL_STATUS); + writel(HIBMC_DP_INT_ENABLE, dp_dev->base + HIBMC_DP_INTR_ENABLE); /* rst */ writel(HIBMC_DP_DPTX_RST, dp_dev->base + HIBMC_DP_DPTX_RST_CTRL); /* clock enable */ @@ -284,3 +285,32 @@ void hibmc_dp_set_cbar(struct hibmc_dp *dp, const struct hibmc_dp_cbar_cfg *cfg) hibmc_dp_reg_write_field(dp_dev, HIBMC_DP_COLOR_BAR_CTRL, BIT(0), cfg->enable); writel(HIBMC_DP_SYNC_EN_MASK, dp_dev->base + HIBMC_DP_TIMING_SYNC_CTRL); } + +enum hibmc_dp_hpd_status hibmc_dp_get_hpd_status(const struct hibmc_dp *dp) +{ + enum hibmc_dp_hpd_status status; + u32 val; + + mdelay(100);why?
Because the spec says the HPD signal needs to be pulled up for more than 100 ms to enter the plug from the ilde. I will add comment here.
+ + val = readl(dp->dp_dev->base + HIBMC_DP_HPD_STATUS); + val = (val & HIBMC_DP_CFG_SINK_HPD_STATE_MACHINE) >> 4; + + switch (val) { + case 0: /* 0: IDLE */ + case 3: /* 3: DONE */ + status = HIBMC_DP_HPD_OUT; + break; + case 1: /* 1: PLUG */ + status = HIBMC_DP_HPD_IN; + break; + case 4: /* 4: ASSERT_LENGHT */ + status = HIBMC_DP_HPD_DETECTING; + break; + default: /* unknown status */ + status = HIBMC_DP_HPD_DET_FAIL; + break; + } + + return status; +} diff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h index f2f59f2feb3c..6f1da7a0b9e7 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h +++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_hw.h @@ -61,6 +61,7 @@ struct hibmc_dp { struct drm_dp_aux aux; struct hibmc_dp_cbar_cfg cfg; bool is_inited; + u32 hpd_status; };int hibmc_dp_hw_init(struct hibmc_dp *dp);@@ -70,5 +71,6 @@ int hibmc_dp_get_dpcd(struct hibmc_dp *dp); u8 hibmc_dp_get_link_rate(struct hibmc_dp *dp); u8 hibmc_dp_get_lanes(struct hibmc_dp *dp); void hibmc_dp_set_cbar(struct hibmc_dp *dp, const struct hibmc_dp_cbar_cfg *cfg); +enum hibmc_dp_hpd_status hibmc_dp_get_hpd_status(const struct hibmc_dp *dp);#endifdiff --git a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h index c43ad6b30c2c..6c4ba0412b15 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h +++ b/drivers/gpu/drm/hisilicon/hibmc/dp/dp_reg.h @@ -12,6 +12,7 @@ #define HIBMC_DP_AUX_RD_DATA0 0x64 #define HIBMC_DP_AUX_REQ 0x74 #define HIBMC_DP_AUX_STATUS 0x78 +#define HIBMC_DP_HPD_STATUS 0x98 #define HIBMC_DP_PHYIF_CTRL0 0xa0 #define HIBMC_DP_VIDEO_CTRL 0x100 #define HIBMC_DP_VIDEO_CONFIG0 0x104 @@ -75,5 +76,6 @@ #define HIBMC_DP_CFG_STREAM_HTOTAL_SIZE GENMASK(31, 16) #define HIBMC_DP_CFG_STREAM_HBLANK_SIZE GENMASK(15, 0) #define HIBMC_DP_CFG_STREAM_SYNC_CALIBRATION GENMASK(31, 20) +#define HIBMC_DP_CFG_SINK_HPD_STATE_MACHINE GENMASK(7, 4)#endifdiff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c index cc1f9ee0656f..e4aee75e12e8 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_dp.c @@ -11,8 +11,12 @@ #include <drm/drm_edid.h>#include "hibmc_drm_drv.h"+#include "hibmc_drm_regs.h" #include "dp/dp_hw.h"+#define DP_MASKED_SINK_HPD_UNPLUG_INT BIT(3)+#define DP_MASKED_SINK_HPD_PLUG_INT BIT(2) + static int hibmc_dp_connector_get_modes(struct drm_connector *connector) { struct hibmc_dp *dp = to_hibmc_dp(connector); @@ -106,6 +110,57 @@ static const struct drm_encoder_helper_funcs hibmc_dp_encoder_helper_funcs = { .atomic_disable = hibmc_dp_encoder_disable, };+static int hibmc_dp_cfg(struct hibmc_dp *dp)+{ + int ret; + + ret = hibmc_dp_hw_init(dp); + if (ret) + return ret; + + hibmc_dp_display_en(dp, false); + + return 0; +} + +irqreturn_t hibmc_dp_hpd_event_isr(int irq, void *arg) +{ + struct drm_device *dev = (struct drm_device *)arg; + struct hibmc_drm_private *priv = to_hibmc_drm_private(dev); + enum hibmc_dp_hpd_status status; + struct drm_display_mode *mode; + int idx; + + if (!drm_dev_enter(dev, &idx)) + return -ENODEV; + + status = hibmc_dp_get_hpd_status(&priv->dp); + if (status == HIBMC_DP_HPD_IN) { + if (!(priv->dp.hpd_status & DP_MASKED_SINK_HPD_PLUG_INT)) + goto err; + drm_dbg_dp(&priv->dev, "HPD IN isr occur!\n"); + hibmc_dp_cfg(&priv->dp); + drm_kms_helper_connector_hotplug_event(&priv->dp.connector); + mode = &priv->crtc.state->adjusted_mode; + hibmc_dp_prepare(&priv->dp, mode); + hibmc_dp_display_en(&priv->dp, true);No, please don't enable the display without the framework telling you to do so.
Okay, I got it, but I can't find a callback to process these set_mode and enable functions after the interrupt triggered. How can I let the framework know the irq process is done, and it's ready to enable display again?
+ } else if (status == HIBMC_DP_HPD_OUT) { + if (!(priv->dp.hpd_status & DP_MASKED_SINK_HPD_UNPLUG_INT)) + goto err; + drm_dbg_dp(&priv->dev, "HPD OUT isr occur!\n"); + hibmc_dp_display_en(&priv->dp, false); + } else { + drm_warn(&priv->dev, "HPD unknown isr occur, status: %d\n", status); + } + +err: + priv->dp.hpd_status = 0; + + drm_dev_exit(idx); + + return IRQ_HANDLED; +} + int hibmc_dp_init(struct hibmc_drm_private *priv) { struct drm_device *dev = &priv->dev; @@ -118,14 +173,12 @@ int hibmc_dp_init(struct hibmc_drm_private *priv) dp->mmio = priv->mmio; dp->drm_dev = dev;- ret = hibmc_dp_hw_init(&priv->dp);+ ret = hibmc_dp_cfg(dp); if (ret) { - drm_err(dev, "hibmc dp hw init failed: %d\n", ret); + drm_err(dev, "hibmc dp cfg failed: %d\n", ret); return ret; }- hibmc_dp_display_en(&priv->dp, false);- encoder->possible_crtcs = drm_crtc_mask(crtc); ret = drmm_encoder_init(dev, encoder, NULL, DRM_MODE_ENCODER_TMDS, NULL); if (ret) { diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c index 3d4d5185c523..42323ff89309 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.c @@ -29,9 +29,13 @@ #include "hibmc_drm_regs.h"#define HIBMC_DP_HOST_SERDES_CTRL 0x1f001c+#define HIBMC_DP_INTSTAT 0x1e0724 +#define HIBMC_DP_INTCLR 0x1e0728DEFINE_DRM_GEM_FOPS(hibmc_fops); +static const char *g_irqs_names_map[HIBMC_MAX_VECTORS] = { "vblank", "hpd" };+ static irqreturn_t hibmc_interrupt(int irq, void *arg) { struct drm_device *dev = (struct drm_device *)arg; @@ -49,6 +53,22 @@ static irqreturn_t hibmc_interrupt(int irq, void *arg) return IRQ_HANDLED; }+static irqreturn_t hibmc_dp_interrupt(int irq, void *arg)+{ + struct drm_device *dev = (struct drm_device *)arg; + struct hibmc_drm_private *priv = to_hibmc_drm_private(dev); + u32 status; + + status = readl(priv->mmio + HIBMC_DP_INTSTAT); + if (status) { + priv->dp.hpd_status = status; + writel(status, priv->mmio + HIBMC_DP_INTCLR); + return IRQ_WAKE_THREAD; + } + + return IRQ_HANDLED; +} + static int hibmc_dumb_create(struct drm_file *file, struct drm_device *dev, struct drm_mode_create_dumb *args) { @@ -248,15 +268,52 @@ static int hibmc_hw_init(struct hibmc_drm_private *priv) return 0; }-static int hibmc_unload(struct drm_device *dev)+static void hibmc_unload(struct drm_device *dev) +{ + drm_atomic_helper_shutdown(dev); + + pci_disable_msi(to_pci_dev(dev->dev)); +} + +static int hibmc_msi_init(struct drm_device *dev) { + struct hibmc_drm_private *priv = to_hibmc_drm_private(dev); struct pci_dev *pdev = to_pci_dev(dev->dev); + int ret;- drm_atomic_helper_shutdown(dev);+ ret = pci_alloc_irq_vectors(pdev, HIBMC_MIN_VECTORS, + HIBMC_MAX_VECTORS, PCI_IRQ_MSI); + if (ret < 0) { + drm_err(dev, "enabling MSI failed: %d\n", ret); + return ret; + }- free_irq(pdev->irq, dev);+ priv->valid_irq_num = ret;- pci_disable_msi(to_pci_dev(dev->dev));+ priv->irqs = drmm_kcalloc(dev, priv->valid_irq_num, + sizeof(struct hibmc_irq), GFP_KERNEL); + if (!priv->irqs) + return -ENOMEM; + + for (int i = 0; i < priv->valid_irq_num; i++) { + snprintf(priv->irqs[i].name, sizeof(priv->irqs[i].name) - 1, "%s-%s-%s", + dev->driver->name, pci_name(pdev), g_irqs_names_map[i]); + + priv->irqs[i].irq_num = pci_irq_vector(pdev, i); + + if (i) + /* PCI devices require shared interrupts. */ + ret = devm_request_threaded_irq(&pdev->dev, priv->irqs[i].irq_num, + hibmc_dp_interrupt, hibmc_dp_hpd_event_isr, + IRQF_SHARED, priv->irqs[i].name, dev); + else + ret = devm_request_irq(&pdev->dev, priv->irqs[i].irq_num, hibmc_interrupt, + IRQF_SHARED, priv->irqs[i].name, dev); + if (ret) { + drm_err(dev, "install irq failed: %d\n", ret); + return ret; + } + }return 0;} @@ -288,15 +345,10 @@ static int hibmc_load(struct drm_device *dev) goto err; }- ret = pci_enable_msi(pdev);+ ret = hibmc_msi_init(dev); if (ret) { - drm_warn(dev, "enabling MSI failed: %d\n", ret); - } else { - /* PCI devices require shared interrupts. */ - ret = request_irq(pdev->irq, hibmc_interrupt, IRQF_SHARED, - dev->driver->name, dev); - if (ret) - drm_warn(dev, "install irq failed: %d\n", ret); + drm_err(dev, "hibmc msi init failed, ret:%d\n", ret); + goto err; }/* reset all the states of crtc/plane/encoder/connector */@@ -375,7 +427,7 @@ static void hibmc_pci_remove(struct pci_dev *pdev)static void hibmc_pci_shutdown(struct pci_dev *pdev){ - drm_atomic_helper_shutdown(pci_get_drvdata(pdev)); + hibmc_pci_remove(pdev); }static const struct pci_device_id hibmc_pci_table[] = {diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h index ff61efb8a2ab..3bc4194689cb 100644 --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_drv.h @@ -22,6 +22,14 @@#include "dp/dp_hw.h" +#define HIBMC_MIN_VECTORS 1+#define HIBMC_MAX_VECTORS 2 + +struct hibmc_irq { + s32 irq_num; + char name[32]; +}; + struct hibmc_vdac { struct drm_device *dev; struct drm_encoder encoder; @@ -40,6 +48,10 @@ struct hibmc_drm_private { struct drm_crtc crtc; struct hibmc_vdac vdac; struct hibmc_dp dp; + + /* irqs */ + struct hibmc_irq *irqs; + u32 valid_irq_num; };static inline struct hibmc_vdac *to_hibmc_vdac(struct drm_connector *connector)@@ -71,4 +83,6 @@ int hibmc_dp_init(struct hibmc_drm_private *priv);void hibmc_debugfs_register(struct hibmc_drm_private *priv); +irqreturn_t hibmc_dp_hpd_event_isr(int irq, void *arg);+ #endif -- 2.33.0
