diff options
Diffstat (limited to 'drivers/gpu/drm/vc4/vc4_hdmi.c')
| -rw-r--r-- | drivers/gpu/drm/vc4/vc4_hdmi.c | 590 |
1 files changed, 590 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c new file mode 100644 index 000000000000..da9a36d6e1d1 --- /dev/null +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -0,0 +1,590 @@ +/* + * Copyright (C) 2015 Broadcom + * Copyright (c) 2014 The Linux Foundation. All rights reserved. + * Copyright (C) 2013 Red Hat + * Author: Rob Clark <robdclark@gmail.com> + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 as published by + * the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for + * more details. + * + * You should have received a copy of the GNU General Public License along with + * this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/** + * DOC: VC4 Falcon HDMI module + * + * The HDMI core has a state machine and a PHY. Most of the unit + * operates off of the HSM clock from CPRMAN. It also internally uses + * the PLLH_PIX clock for the PHY. + */ + +#include "drm_atomic_helper.h" +#include "drm_crtc_helper.h" +#include "drm_edid.h" +#include "linux/clk.h" +#include "linux/component.h" +#include "linux/i2c.h" +#include "linux/of_gpio.h" +#include "linux/of_platform.h" +#include "vc4_drv.h" +#include "vc4_regs.h" + +/* General HDMI hardware state. */ +struct vc4_hdmi { + struct platform_device *pdev; + + struct drm_encoder *encoder; + struct drm_connector *connector; + + struct i2c_adapter *ddc; + void __iomem *hdmicore_regs; + void __iomem *hd_regs; + int hpd_gpio; + + struct clk *pixel_clock; + struct clk *hsm_clock; +}; + +#define HDMI_READ(offset) readl(vc4->hdmi->hdmicore_regs + offset) +#define HDMI_WRITE(offset, val) writel(val, vc4->hdmi->hdmicore_regs + offset) +#define HD_READ(offset) readl(vc4->hdmi->hd_regs + offset) +#define HD_WRITE(offset, val) writel(val, vc4->hdmi->hd_regs + offset) + +/* VC4 HDMI encoder KMS struct */ +struct vc4_hdmi_encoder { + struct vc4_encoder base; + bool hdmi_monitor; +}; + +static inline struct vc4_hdmi_encoder * +to_vc4_hdmi_encoder(struct drm_encoder *encoder) +{ + return container_of(encoder, struct vc4_hdmi_encoder, base.base); +} + +/* VC4 HDMI connector KMS struct */ +struct vc4_hdmi_connector { + struct drm_connector base; + + /* Since the connector is attached to just the one encoder, + * this is the reference to it so we can do the best_encoder() + * hook. + */ + struct drm_encoder *encoder; +}; + +static inline struct vc4_hdmi_connector * +to_vc4_hdmi_connector(struct drm_connector *connector) +{ + return container_of(connector, struct vc4_hdmi_connector, base); +} + +#define HDMI_REG(reg) { reg, #reg } +static const struct { + u32 reg; + const char *name; +} hdmi_regs[] = { + HDMI_REG(VC4_HDMI_CORE_REV), + HDMI_REG(VC4_HDMI_SW_RESET_CONTROL), + HDMI_REG(VC4_HDMI_HOTPLUG_INT), + HDMI_REG(VC4_HDMI_HOTPLUG), + HDMI_REG(VC4_HDMI_HORZA), + HDMI_REG(VC4_HDMI_HORZB), + HDMI_REG(VC4_HDMI_FIFO_CTL), + HDMI_REG(VC4_HDMI_SCHEDULER_CONTROL), + HDMI_REG(VC4_HDMI_VERTA0), + HDMI_REG(VC4_HDMI_VERTA1), + HDMI_REG(VC4_HDMI_VERTB0), + HDMI_REG(VC4_HDMI_VERTB1), + HDMI_REG(VC4_HDMI_TX_PHY_RESET_CTL), +}; + +static const struct { + u32 reg; + const char *name; +} hd_regs[] = { + HDMI_REG(VC4_HD_M_CTL), + HDMI_REG(VC4_HD_MAI_CTL), + HDMI_REG(VC4_HD_VID_CTL), + HDMI_REG(VC4_HD_CSC_CTL), + HDMI_REG(VC4_HD_FRAME_COUNT), +}; + +#ifdef CONFIG_DEBUG_FS +int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused) +{ + struct drm_info_node *node = (struct drm_info_node *)m->private; + struct drm_device *dev = node->minor->dev; + struct vc4_dev *vc4 = to_vc4_dev(dev); + int i; + + for (i = 0; i < ARRAY_SIZE(hdmi_regs); i++) { + seq_printf(m, "%s (0x%04x): 0x%08x\n", + hdmi_regs[i].name, hdmi_regs[i].reg, + HDMI_READ(hdmi_regs[i].reg)); + } + + for (i = 0; i < ARRAY_SIZE(hd_regs); i++) { + seq_printf(m, "%s (0x%04x): 0x%08x\n", + hd_regs[i].name, hd_regs[i].reg, + HD_READ(hd_regs[i].reg)); + } + + return 0; +} +#endif /* CONFIG_DEBUG_FS */ + +static void vc4_hdmi_dump_regs(struct drm_device *dev) +{ + struct vc4_dev *vc4 = to_vc4_dev(dev); + int i; + + for (i = 0; i < ARRAY_SIZE(hdmi_regs); i++) { + DRM_INFO("0x%04x (%s): 0x%08x\n", + hdmi_regs[i].reg, hdmi_regs[i].name, + HDMI_READ(hdmi_regs[i].reg)); + } + for (i = 0; i < ARRAY_SIZE(hd_regs); i++) { + DRM_INFO("0x%04x (%s): 0x%08x\n", + hd_regs[i].reg, hd_regs[i].name, + HD_READ(hd_regs[i].reg)); + } +} + +static enum drm_connector_status +vc4_hdmi_connector_detect(struct drm_connector *connector, bool force) +{ + struct drm_device *dev = connector->dev; + struct vc4_dev *vc4 = to_vc4_dev(dev); + + if (vc4->hdmi->hpd_gpio) { + if (gpio_get_value(vc4->hdmi->hpd_gpio)) + return connector_status_connected; + else + return connector_status_disconnected; + } + + if (HDMI_READ(VC4_HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED) + return connector_status_connected; + else + return connector_status_disconnected; +} + +static void vc4_hdmi_connector_destroy(struct drm_connector *connector) +{ + drm_connector_unregister(connector); + drm_connector_cleanup(connector); +} + +static int vc4_hdmi_connector_get_modes(struct drm_connector *connector) +{ + struct vc4_hdmi_connector *vc4_connector = + to_vc4_hdmi_connector(connector); + struct drm_encoder *encoder = vc4_connector->encoder; + struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder); + struct drm_device *dev = connector->dev; + struct vc4_dev *vc4 = to_vc4_dev(dev); + int ret = 0; + struct edid *edid; + + edid = drm_get_edid(connector, vc4->hdmi->ddc); + if (!edid) + return -ENODEV; + + vc4_encoder->hdmi_monitor = drm_detect_hdmi_monitor(edid); + drm_mode_connector_update_edid_property(connector, edid); + ret = drm_add_edid_modes(connector, edid); + + return ret; +} + +static struct drm_encoder * +vc4_hdmi_connector_best_encoder(struct drm_connector *connector) +{ + struct vc4_hdmi_connector *hdmi_connector = + to_vc4_hdmi_connector(connector); + return hdmi_connector->encoder; +} + +static const struct drm_connector_funcs vc4_hdmi_connector_funcs = { + .dpms = drm_atomic_helper_connector_dpms, + .detect = vc4_hdmi_connector_detect, + .fill_modes = drm_helper_probe_single_connector_modes, + .destroy = vc4_hdmi_connector_destroy, + .reset = drm_atomic_helper_connector_reset, + .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, + .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, +}; + +static const struct drm_connector_helper_funcs vc4_hdmi_connector_helper_funcs = { + .get_modes = vc4_hdmi_connector_get_modes, + .best_encoder = vc4_hdmi_connector_best_encoder, +}; + +static struct drm_connector *vc4_hdmi_connector_init(struct drm_device *dev, + struct drm_encoder *encoder) +{ + struct drm_connector *connector = NULL; + struct vc4_hdmi_connector *hdmi_connector; + int ret = 0; + + hdmi_connector = devm_kzalloc(dev->dev, sizeof(*hdmi_connector), + GFP_KERNEL); + if (!hdmi_connector) { + ret = -ENOMEM; + goto fail; + } + connector = &hdmi_connector->base; + + hdmi_connector->encoder = encoder; + + drm_connector_init(dev, connector, &vc4_hdmi_connector_funcs, + DRM_MODE_CONNECTOR_HDMIA); + drm_connector_helper_add(connector, &vc4_hdmi_connector_helper_funcs); + + connector->polled = (DRM_CONNECTOR_POLL_CONNECT | + DRM_CONNECTOR_POLL_DISCONNECT); + + connector->interlace_allowed = 0; + connector->doublescan_allowed = 0; + + drm_mode_connector_attach_encoder(connector, encoder); + + return connector; + + fail: + if (connector) + vc4_hdmi_connector_destroy(connector); + + return ERR_PTR(ret); +} + +static void vc4_hdmi_encoder_destroy(struct drm_encoder *encoder) +{ + drm_encoder_cleanup(encoder); +} + +static const struct drm_encoder_funcs vc4_hdmi_encoder_funcs = { + .destroy = vc4_hdmi_encoder_destroy, +}; + +static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder, + struct drm_display_mode *unadjusted_mode, + struct drm_display_mode *mode) +{ + struct drm_device *dev = encoder->dev; + struct vc4_dev *vc4 = to_vc4_dev(dev); + bool debug_dump_regs = false; + bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC; + bool vsync_pos = mode->flags & DRM_MODE_FLAG_PVSYNC; + u32 vactive = (mode->vdisplay >> + ((mode->flags & DRM_MODE_FLAG_INTERLACE) ? 1 : 0)); + u32 verta = (VC4_SET_FIELD(mode->vsync_end - mode->vsync_start, + VC4_HDMI_VERTA_VSP) | + VC4_SET_FIELD(mode->vsync_start - mode->vdisplay, + VC4_HDMI_VERTA_VFP) | + VC4_SET_FIELD(vactive, VC4_HDMI_VERTA_VAL)); + u32 vertb = (VC4_SET_FIELD(0, VC4_HDMI_VERTB_VSPO) | + VC4_SET_FIELD(mode->vtotal - mode->vsync_end, + VC4_HDMI_VERTB_VBP)); + + if (debug_dump_regs) { + DRM_INFO("HDMI regs before:\n"); + vc4_hdmi_dump_regs(dev); + } + + HD_WRITE(VC4_HD_VID_CTL, 0); + + clk_set_rate(vc4->hdmi->pixel_clock, mode->clock * 1000); + + HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL, + HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) | + VC4_HDMI_SCHEDULER_CONTROL_MANUAL_FORMAT | + VC4_HDMI_SCHEDULER_CONTROL_IGNORE_VSYNC_PREDICTS); + + HDMI_WRITE(VC4_HDMI_HORZA, + (vsync_pos ? VC4_HDMI_HORZA_VPOS : 0) | + (hsync_pos ? VC4_HDMI_HORZA_HPOS : 0) | + VC4_SET_FIELD(mode->hdisplay, VC4_HDMI_HORZA_HAP)); + + HDMI_WRITE(VC4_HDMI_HORZB, + VC4_SET_FIELD(mode->htotal - mode->hsync_end, + VC4_HDMI_HORZB_HBP) | + VC4_SET_FIELD(mode->hsync_end - mode->hsync_start, + VC4_HDMI_HORZB_HSP) | + VC4_SET_FIELD(mode->hsync_start - mode->hdisplay, + VC4_HDMI_HORZB_HFP)); + + HDMI_WRITE(VC4_HDMI_VERTA0, verta); + HDMI_WRITE(VC4_HDMI_VERTA1, verta); + + HDMI_WRITE(VC4_HDMI_VERTB0, vertb); + HDMI_WRITE(VC4_HDMI_VERTB1, vertb); + + HD_WRITE(VC4_HD_VID_CTL, + (vsync_pos ? 0 : VC4_HD_VID_CTL_VSYNC_LOW) | + (hsync_pos ? 0 : VC4_HD_VID_CTL_HSYNC_LOW)); + + /* The RGB order applies even when CSC is disabled. */ + HD_WRITE(VC4_HD_CSC_CTL, VC4_SET_FIELD(VC4_HD_CSC_CTL_ORDER_BGR, + VC4_HD_CSC_CTL_ORDER)); + + HDMI_WRITE(VC4_HDMI_FIFO_CTL, VC4_HDMI_FIFO_CTL_MASTER_SLAVE_N); + + if (debug_dump_regs) { + DRM_INFO("HDMI regs after:\n"); + vc4_hdmi_dump_regs(dev); + } +} + +static void vc4_hdmi_encoder_disable(struct drm_encoder *encoder) +{ + struct drm_device *dev = encoder->dev; + struct vc4_dev *vc4 = to_vc4_dev(dev); + + HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0xf << 16); + HD_WRITE(VC4_HD_VID_CTL, + HD_READ(VC4_HD_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE); +} + +static void vc4_hdmi_encoder_enable(struct drm_encoder *encoder) +{ + struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder); + struct drm_device *dev = encoder->dev; + struct vc4_dev *vc4 = to_vc4_dev(dev); + int ret; + + HDMI_WRITE(VC4_HDMI_TX_PHY_RESET_CTL, 0); + + HD_WRITE(VC4_HD_VID_CTL, + HD_READ(VC4_HD_VID_CTL) | + VC4_HD_VID_CTL_ENABLE | + VC4_HD_VID_CTL_UNDERFLOW_ENABLE | + VC4_HD_VID_CTL_FRAME_COUNTER_RESET); + + if (vc4_encoder->hdmi_monitor) { + HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL, + HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) | + VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI); + + ret = wait_for(HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) & + VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE, 1); + WARN_ONCE(ret, "Timeout waiting for " + "VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE\n"); + } else { + HDMI_WRITE(VC4_HDMI_RAM_PACKET_CONFIG, + HDMI_READ(VC4_HDMI_RAM_PACKET_CONFIG) & + ~(VC4_HDMI_RAM_PACKET_ENABLE)); + HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL, + HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) & + ~VC4_HDMI_SCHEDULER_CONTROL_MODE_HDMI); + + ret = wait_for(!(HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) & + VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE), 1); + WARN_ONCE(ret, "Timeout waiting for " + "!VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE\n"); + } + + if (vc4_encoder->hdmi_monitor) { + u32 drift; + + WARN_ON(!(HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) & + VC4_HDMI_SCHEDULER_CONTROL_HDMI_ACTIVE)); + HDMI_WRITE(VC4_HDMI_SCHEDULER_CONTROL, + HDMI_READ(VC4_HDMI_SCHEDULER_CONTROL) | + VC4_HDMI_SCHEDULER_CONTROL_VERT_ALWAYS_KEEPOUT); + + /* XXX: Set HDMI_RAM_PACKET_CONFIG (1 << 16) and set + * up the infoframe. + */ + + drift = HDMI_READ(VC4_HDMI_FIFO_CTL); + drift &= VC4_HDMI_FIFO_VALID_WRITE_MASK; + + HDMI_WRITE(VC4_HDMI_FIFO_CTL, + drift & ~VC4_HDMI_FIFO_CTL_RECENTER); + HDMI_WRITE(VC4_HDMI_FIFO_CTL, + drift | VC4_HDMI_FIFO_CTL_RECENTER); + udelay(1000); + HDMI_WRITE(VC4_HDMI_FIFO_CTL, + drift & ~VC4_HDMI_FIFO_CTL_RECENTER); + HDMI_WRITE(VC4_HDMI_FIFO_CTL, + drift | VC4_HDMI_FIFO_CTL_RECENTER); + + ret = wait_for(HDMI_READ(VC4_HDMI_FIFO_CTL) & + VC4_HDMI_FIFO_CTL_RECENTER_DONE, 1); + WARN_ONCE(ret, "Timeout waiting for " + "VC4_HDMI_FIFO_CTL_RECENTER_DONE"); + } +} + +static const struct drm_encoder_helper_funcs vc4_hdmi_encoder_helper_funcs = { + .mode_set = vc4_hdmi_encoder_mode_set, + .disable = vc4_hdmi_encoder_disable, + .enable = vc4_hdmi_encoder_enable, +}; + +static int vc4_hdmi_bind(struct device *dev, struct device *master, void *data) +{ + struct platform_device *pdev = to_platform_device(dev); + struct drm_device *drm = dev_get_drvdata(master); + struct vc4_dev *vc4 = drm->dev_private; + struct vc4_hdmi *hdmi; + struct vc4_hdmi_encoder *vc4_hdmi_encoder; + struct device_node *ddc_node; + u32 value; + int ret; + + hdmi = devm_kzalloc(dev, sizeof(*hdmi), GFP_KERNEL); + if (!hdmi) + return -ENOMEM; + + vc4_hdmi_encoder = devm_kzalloc(dev, sizeof(*vc4_hdmi_encoder), + GFP_KERNEL); + if (!vc4_hdmi_encoder) + return -ENOMEM; + vc4_hdmi_encoder->base.type = VC4_ENCODER_TYPE_HDMI; + hdmi->encoder = &vc4_hdmi_encoder->base.base; + + hdmi->pdev = pdev; + hdmi->hdmicore_regs = vc4_ioremap_regs(pdev, 0); + if (IS_ERR(hdmi->hdmicore_regs)) + return PTR_ERR(hdmi->hdmicore_regs); + + hdmi->hd_regs = vc4_ioremap_regs(pdev, 1); + if (IS_ERR(hdmi->hd_regs)) + return PTR_ERR(hdmi->hd_regs); + + ddc_node = of_parse_phandle(dev->of_node, "ddc", 0); + if (!ddc_node) { + DRM_ERROR("Failed to find ddc node in device tree\n"); + return -ENODEV; + } + + hdmi->pixel_clock = devm_clk_get(dev, "pixel"); + if (IS_ERR(hdmi->pixel_clock)) { + DRM_ERROR("Failed to get pixel clock\n"); + return PTR_ERR(hdmi->pixel_clock); + } + hdmi->hsm_clock = devm_clk_get(dev, "hdmi"); + if (IS_ERR(hdmi->hsm_clock)) { + DRM_ERROR("Failed to get HDMI state machine clock\n"); + return PTR_ERR(hdmi->hsm_clock); + } + + hdmi->ddc = of_find_i2c_adapter_by_node(ddc_node); + if (!hdmi->ddc) { + DRM_DEBUG("Failed to get ddc i2c adapter by node\n"); + return -EPROBE_DEFER; + } + + /* Enable the clocks at startup. We can't quite recover from + * turning off the pixel clock during disable/enables yet, so + * it's always running. + */ + ret = clk_prepare_enable(hdmi->pixel_clock); + if (ret) { + DRM_ERROR("Failed to turn on pixel clock: %d\n", ret); + goto err_put_i2c; + } + + ret = clk_prepare_enable(hdmi->hsm_clock); + if (ret) { + DRM_ERROR("Failed to turn on HDMI state machine clock: %d\n", + ret); + goto err_unprepare_pix; + } + + /* Only use the GPIO HPD pin if present in the DT, otherwise + * we'll use the HDMI core's register. + */ + if (of_find_property(dev->of_node, "hpd-gpios", &value)) { + hdmi->hpd_gpio = of_get_named_gpio(dev->of_node, "hpd-gpios", 0); + if (hdmi->hpd_gpio < 0) { + ret = hdmi->hpd_gpio; + goto err_unprepare_hsm; + } + } + + vc4->hdmi = hdmi; + + /* HDMI core must be enabled. */ + WARN_ON_ONCE((HD_READ(VC4_HD_M_CTL) & VC4_HD_M_ENABLE) == 0); + + drm_encoder_init(drm, hdmi->encoder, &vc4_hdmi_encoder_funcs, + DRM_MODE_ENCODER_TMDS); + drm_encoder_helper_add(hdmi->encoder, &vc4_hdmi_encoder_helper_funcs); + + hdmi->connector = vc4_hdmi_connector_init(drm, hdmi->encoder); + if (IS_ERR(hdmi->connector)) { + ret = PTR_ERR(hdmi->connector); + goto err_destroy_encoder; + } + + return 0; + +err_destroy_encoder: + vc4_hdmi_encoder_destroy(hdmi->encoder); +err_unprepare_hsm: + clk_disable_unprepare(hdmi->hsm_clock); +err_unprepare_pix: + clk_disable_unprepare(hdmi->pixel_clock); +err_put_i2c: + put_device(&vc4->hdmi->ddc->dev); + + return ret; +} + +static void vc4_hdmi_unbind(struct device *dev, struct device *master, + void *data) +{ + struct drm_device *drm = dev_get_drvdata(master); + struct vc4_dev *vc4 = drm->dev_private; + struct vc4_hdmi *hdmi = vc4->hdmi; + + vc4_hdmi_connector_destroy(hdmi->connector); + vc4_hdmi_encoder_destroy(hdmi->encoder); + + clk_disable_unprepare(hdmi->pixel_clock); + clk_disable_unprepare(hdmi->hsm_clock); + put_device(&hdmi->ddc->dev); + + vc4->hdmi = NULL; +} + +static const struct component_ops vc4_hdmi_ops = { + .bind = vc4_hdmi_bind, + .unbind = vc4_hdmi_unbind, +}; + +static int vc4_hdmi_dev_probe(struct platform_device *pdev) +{ + return component_add(&pdev->dev, &vc4_hdmi_ops); +} + +static int vc4_hdmi_dev_remove(struct platform_device *pdev) +{ + component_del(&pdev->dev, &vc4_hdmi_ops); + return 0; +} + +static const struct of_device_id vc4_hdmi_dt_match[] = { + { .compatible = "brcm,bcm2835-hdmi" }, + {} +}; + +struct platform_driver vc4_hdmi_driver = { + .probe = vc4_hdmi_dev_probe, + .remove = vc4_hdmi_dev_remove, + .driver = { + .name = "vc4_hdmi", + .of_match_table = vc4_hdmi_dt_match, + }, +}; |