--- /dev/null
+/*
+ * Copyright (C) 2016 Broadcom Limited
+ *
+ * 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 DPI module
+ *
+ * The VC4 DPI hardware supports MIPI DPI type 4 and Nokia ViSSI
+ * signals, which are routed out to GPIO0-27 with the ALT2 function.
+ */
+
+#include "drm_atomic_helper.h"
+#include "drm_crtc_helper.h"
+#include "drm_edid.h"
+#include "drm_panel.h"
+#include "linux/clk.h"
+#include "linux/component.h"
+#include "linux/of_graph.h"
+#include "linux/of_platform.h"
+#include "vc4_drv.h"
+#include "vc4_regs.h"
+
+#define DPI_C 0x00
+# define DPI_OUTPUT_ENABLE_MODE BIT(16)
+
+/* The order field takes the incoming 24 bit RGB from the pixel valve
+ * and shuffles the 3 channels.
+ */
+# define DPI_ORDER_MASK VC4_MASK(15, 14)
+# define DPI_ORDER_SHIFT 14
+# define DPI_ORDER_RGB 0
+# define DPI_ORDER_BGR 1
+# define DPI_ORDER_GRB 2
+# define DPI_ORDER_BRG 3
+
+/* The format field takes the ORDER-shuffled pixel valve data and
+ * formats it onto the output lines.
+ */
+# define DPI_FORMAT_MASK VC4_MASK(13, 11)
+# define DPI_FORMAT_SHIFT 11
+/* This define is named in the hardware, but actually just outputs 0. */
+# define DPI_FORMAT_9BIT_666_RGB 0
+/* Outputs 00000000rrrrrggggggbbbbb */
+# define DPI_FORMAT_16BIT_565_RGB_1 1
+/* Outputs 000rrrrr00gggggg000bbbbb */
+# define DPI_FORMAT_16BIT_565_RGB_2 2
+/* Outputs 00rrrrr000gggggg00bbbbb0 */
+# define DPI_FORMAT_16BIT_565_RGB_3 3
+/* Outputs 000000rrrrrrggggggbbbbbb */
+# define DPI_FORMAT_18BIT_666_RGB_1 4
+/* Outputs 00rrrrrr00gggggg00bbbbbb */
+# define DPI_FORMAT_18BIT_666_RGB_2 5
+/* Outputs rrrrrrrrggggggggbbbbbbbb */
+# define DPI_FORMAT_24BIT_888_RGB 6
+
+/* Reverses the polarity of the corresponding signal */
+# define DPI_PIXEL_CLK_INVERT BIT(10)
+# define DPI_HSYNC_INVERT BIT(9)
+# define DPI_VSYNC_INVERT BIT(8)
+# define DPI_OUTPUT_ENABLE_INVERT BIT(7)
+
+/* Outputs the signal the falling clock edge instead of rising. */
+# define DPI_HSYNC_NEGATE BIT(6)
+# define DPI_VSYNC_NEGATE BIT(5)
+# define DPI_OUTPUT_ENABLE_NEGATE BIT(4)
+
+/* Disables the signal */
+# define DPI_HSYNC_DISABLE BIT(3)
+# define DPI_VSYNC_DISABLE BIT(2)
+# define DPI_OUTPUT_ENABLE_DISABLE BIT(1)
+
+/* Power gate to the device, full reset at 0 -> 1 transition */
+# define DPI_ENABLE BIT(0)
+
+/* All other registers besides DPI_C return the ID */
+#define DPI_ID 0x04
+# define DPI_ID_VALUE 0x00647069
+
+/* General DPI hardware state. */
+struct vc4_dpi {
+ struct platform_device *pdev;
+
+ struct drm_encoder *encoder;
+ struct drm_connector *connector;
+ struct drm_panel *panel;
+
+ void __iomem *regs;
+
+ struct clk *pixel_clock;
+ struct clk *core_clock;
+};
+
+#define DPI_READ(offset) readl(dpi->regs + (offset))
+#define DPI_WRITE(offset, val) writel(val, dpi->regs + (offset))
+
+/* VC4 DPI encoder KMS struct */
+struct vc4_dpi_encoder {
+ struct vc4_encoder base;
+ struct vc4_dpi *dpi;
+};
+
+static inline struct vc4_dpi_encoder *
+to_vc4_dpi_encoder(struct drm_encoder *encoder)
+{
+ return container_of(encoder, struct vc4_dpi_encoder, base.base);
+}
+
+/* VC4 DPI connector KMS struct */
+struct vc4_dpi_connector {
+ struct drm_connector base;
+ struct vc4_dpi *dpi;
+
+ /* 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_dpi_connector *
+to_vc4_dpi_connector(struct drm_connector *connector)
+{
+ return container_of(connector, struct vc4_dpi_connector, base);
+}
+
+#define DPI_REG(reg) { reg, #reg }
+static const struct {
+ u32 reg;
+ const char *name;
+} dpi_regs[] = {
+ DPI_REG(DPI_C),
+ DPI_REG(DPI_ID),
+};
+
+static void vc4_dpi_dump_regs(struct vc4_dpi *dpi)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) {
+ DRM_INFO("0x%04x (%s): 0x%08x\n",
+ dpi_regs[i].reg, dpi_regs[i].name,
+ DPI_READ(dpi_regs[i].reg));
+ }
+}
+
+#ifdef CONFIG_DEBUG_FS
+int vc4_dpi_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);
+ struct vc4_dpi *dpi = vc4->dpi;
+ int i;
+
+ if (!dpi)
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(dpi_regs); i++) {
+ seq_printf(m, "%s (0x%04x): 0x%08x\n",
+ dpi_regs[i].name, dpi_regs[i].reg,
+ DPI_READ(dpi_regs[i].reg));
+ }
+
+ return 0;
+}
+#endif
+
+static enum drm_connector_status
+vc4_dpi_connector_detect(struct drm_connector *connector, bool force)
+{
+ struct vc4_dpi_connector *vc4_connector =
+ to_vc4_dpi_connector(connector);
+ struct vc4_dpi *dpi = vc4_connector->dpi;
+
+ if (dpi->panel)
+ return connector_status_connected;
+ else
+ return connector_status_disconnected;
+}
+
+static void vc4_dpi_connector_destroy(struct drm_connector *connector)
+{
+ drm_connector_unregister(connector);
+ drm_connector_cleanup(connector);
+}
+
+static int vc4_dpi_connector_get_modes(struct drm_connector *connector)
+{
+ struct vc4_dpi_connector *vc4_connector =
+ to_vc4_dpi_connector(connector);
+ struct vc4_dpi *dpi = vc4_connector->dpi;
+
+ if (dpi->panel)
+ return drm_panel_get_modes(dpi->panel);
+
+ return 0;
+}
+
+static struct drm_encoder *
+vc4_dpi_connector_best_encoder(struct drm_connector *connector)
+{
+ struct vc4_dpi_connector *dpi_connector =
+ to_vc4_dpi_connector(connector);
+ return dpi_connector->encoder;
+}
+
+static const struct drm_connector_funcs vc4_dpi_connector_funcs = {
+ .dpms = drm_atomic_helper_connector_dpms,
+ .detect = vc4_dpi_connector_detect,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .destroy = vc4_dpi_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_dpi_connector_helper_funcs = {
+ .get_modes = vc4_dpi_connector_get_modes,
+ .best_encoder = vc4_dpi_connector_best_encoder,
+};
+
+static struct drm_connector *vc4_dpi_connector_init(struct drm_device *dev,
+ struct vc4_dpi *dpi)
+{
+ struct drm_connector *connector = NULL;
+ struct vc4_dpi_connector *dpi_connector;
+ int ret = 0;
+
+ dpi_connector = devm_kzalloc(dev->dev, sizeof(*dpi_connector),
+ GFP_KERNEL);
+ if (!dpi_connector) {
+ ret = -ENOMEM;
+ goto fail;
+ }
+ connector = &dpi_connector->base;
+
+ dpi_connector->encoder = dpi->encoder;
+ dpi_connector->dpi = dpi;
+
+ drm_connector_init(dev, connector, &vc4_dpi_connector_funcs,
+ DRM_MODE_CONNECTOR_DPI);
+ drm_connector_helper_add(connector, &vc4_dpi_connector_helper_funcs);
+
+ connector->polled = 0;
+ connector->interlace_allowed = 0;
+ connector->doublescan_allowed = 0;
+
+ drm_mode_connector_attach_encoder(connector, dpi->encoder);
+
+ return connector;
+
+ fail:
+ if (connector)
+ vc4_dpi_connector_destroy(connector);
+
+ return ERR_PTR(ret);
+}
+
+static const struct drm_encoder_funcs vc4_dpi_encoder_funcs = {
+ .destroy = drm_encoder_cleanup,
+};
+
+static void vc4_dpi_encoder_disable(struct drm_encoder *encoder)
+{
+ struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
+ struct vc4_dpi *dpi = vc4_encoder->dpi;
+
+ drm_panel_disable(dpi->panel);
+
+ clk_disable_unprepare(dpi->pixel_clock);
+
+ drm_panel_unprepare(dpi->panel);
+}
+
+static void vc4_dpi_encoder_enable(struct drm_encoder *encoder)
+{
+ struct drm_display_mode *mode = &encoder->crtc->mode;
+ struct vc4_dpi_encoder *vc4_encoder = to_vc4_dpi_encoder(encoder);
+ struct vc4_dpi *dpi = vc4_encoder->dpi;
+ u32 dpi_c = DPI_ENABLE | DPI_OUTPUT_ENABLE_MODE;
+ int ret;
+
+ ret = drm_panel_prepare(dpi->panel);
+ if (ret) {
+ DRM_ERROR("Panel failed to prepare\n");
+ return;
+ }
+
+ if (dpi->connector->display_info.num_bus_formats) {
+ u32 bus_format = dpi->connector->display_info.bus_formats[0];
+
+ switch (bus_format) {
+ case MEDIA_BUS_FMT_RGB888_1X24:
+ dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB,
+ DPI_FORMAT);
+ break;
+ case MEDIA_BUS_FMT_BGR888_1X24:
+ dpi_c |= VC4_SET_FIELD(DPI_FORMAT_24BIT_888_RGB,
+ DPI_FORMAT);
+ dpi_c |= VC4_SET_FIELD(DPI_ORDER_BGR, DPI_ORDER);
+ break;
+ case MEDIA_BUS_FMT_RGB666_1X24_CPADHI:
+ dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_2,
+ DPI_FORMAT);
+ break;
+ case MEDIA_BUS_FMT_RGB666_1X18:
+ dpi_c |= VC4_SET_FIELD(DPI_FORMAT_18BIT_666_RGB_1,
+ DPI_FORMAT);
+ break;
+ case MEDIA_BUS_FMT_RGB565_1X16:
+ dpi_c |= VC4_SET_FIELD(DPI_FORMAT_16BIT_565_RGB_3,
+ DPI_FORMAT);
+ break;
+ default:
+ DRM_ERROR("Unknown media bus format %d\n", bus_format);
+ break;
+ }
+ }
+
+ if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+ dpi_c |= DPI_HSYNC_INVERT;
+ else if (!(mode->flags & DRM_MODE_FLAG_PHSYNC))
+ dpi_c |= DPI_HSYNC_DISABLE;
+
+ if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+ dpi_c |= DPI_VSYNC_INVERT;
+ else if (!(mode->flags & DRM_MODE_FLAG_PVSYNC))
+ dpi_c |= DPI_VSYNC_DISABLE;
+
+ DPI_WRITE(DPI_C, dpi_c);
+
+ ret = clk_set_rate(dpi->pixel_clock, mode->clock * 1000);
+ if (ret)
+ DRM_ERROR("Failed to set clock rate: %d\n", ret);
+
+ ret = clk_prepare_enable(dpi->pixel_clock);
+ if (ret)
+ DRM_ERROR("Failed to set clock rate: %d\n", ret);
+
+ ret = drm_panel_enable(dpi->panel);
+ if (ret) {
+ DRM_ERROR("Panel failed to enable\n");
+ drm_panel_unprepare(dpi->panel);
+ return;
+ }
+}
+
+static const struct drm_encoder_helper_funcs vc4_dpi_encoder_helper_funcs = {
+ .disable = vc4_dpi_encoder_disable,
+ .enable = vc4_dpi_encoder_enable,
+};
+
+static const struct of_device_id vc4_dpi_dt_match[] = {
+ { .compatible = "brcm,bcm2835-dpi", .data = NULL },
+ {}
+};
+
+/* Walks the OF graph to find the panel node and then asks DRM to look
+ * up the panel.
+ */
+static struct drm_panel *vc4_dpi_get_panel(struct device *dev)
+{
+ struct device_node *endpoint, *panel_node;
+ struct device_node *np = dev->of_node;
+ struct drm_panel *panel;
+
+ endpoint = of_graph_get_next_endpoint(np, NULL);
+ if (!endpoint) {
+ dev_err(dev, "no endpoint to fetch DPI panel\n");
+ return NULL;
+ }
+
+ /* don't proceed if we have an endpoint but no panel_node tied to it */
+ panel_node = of_graph_get_remote_port_parent(endpoint);
+ of_node_put(endpoint);
+ if (!panel_node) {
+ dev_err(dev, "no valid panel node\n");
+ return NULL;
+ }
+
+ panel = of_drm_find_panel(panel_node);
+ of_node_put(panel_node);
+
+ return panel;
+}
+
+static int vc4_dpi_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 = to_vc4_dev(drm);
+ struct vc4_dpi *dpi;
+ struct vc4_dpi_encoder *vc4_dpi_encoder;
+ int ret;
+
+ dpi = devm_kzalloc(dev, sizeof(*dpi), GFP_KERNEL);
+ if (!dpi)
+ return -ENOMEM;
+
+ vc4_dpi_encoder = devm_kzalloc(dev, sizeof(*vc4_dpi_encoder),
+ GFP_KERNEL);
+ if (!vc4_dpi_encoder)
+ return -ENOMEM;
+ vc4_dpi_encoder->base.type = VC4_ENCODER_TYPE_DPI;
+ vc4_dpi_encoder->dpi = dpi;
+ dpi->encoder = &vc4_dpi_encoder->base.base;
+
+ dpi->pdev = pdev;
+ dpi->regs = vc4_ioremap_regs(pdev, 0);
+ if (IS_ERR(dpi->regs))
+ return PTR_ERR(dpi->regs);
+
+ vc4_dpi_dump_regs(dpi);
+
+ if (DPI_READ(DPI_ID) != DPI_ID_VALUE) {
+ dev_err(dev, "Port returned 0x%08x for ID instead of 0x%08x\n",
+ DPI_READ(DPI_ID), DPI_ID_VALUE);
+ return -ENODEV;
+ }
+
+ dpi->core_clock = devm_clk_get(dev, "core");
+ if (IS_ERR(dpi->core_clock)) {
+ ret = PTR_ERR(dpi->core_clock);
+ if (ret != -EPROBE_DEFER)
+ DRM_ERROR("Failed to get core clock: %d\n", ret);
+ return ret;
+ }
+ dpi->pixel_clock = devm_clk_get(dev, "pixel");
+ if (IS_ERR(dpi->pixel_clock)) {
+ ret = PTR_ERR(dpi->pixel_clock);
+ if (ret != -EPROBE_DEFER)
+ DRM_ERROR("Failed to get pixel clock: %d\n", ret);
+ return ret;
+ }
+
+ ret = clk_prepare_enable(dpi->core_clock);
+ if (ret)
+ DRM_ERROR("Failed to turn on core clock: %d\n", ret);
+
+ dpi->panel = vc4_dpi_get_panel(dev);
+
+ drm_encoder_init(drm, dpi->encoder, &vc4_dpi_encoder_funcs,
+ DRM_MODE_ENCODER_DPI, NULL);
+ drm_encoder_helper_add(dpi->encoder, &vc4_dpi_encoder_helper_funcs);
+
+ dpi->connector = vc4_dpi_connector_init(drm, dpi);
+ if (IS_ERR(dpi->connector)) {
+ ret = PTR_ERR(dpi->connector);
+ goto err_destroy_encoder;
+ }
+
+ if (dpi->panel)
+ drm_panel_attach(dpi->panel, dpi->connector);
+
+ dev_set_drvdata(dev, dpi);
+
+ vc4->dpi = dpi;
+
+ return 0;
+
+err_destroy_encoder:
+ drm_encoder_cleanup(dpi->encoder);
+ clk_disable_unprepare(dpi->core_clock);
+ return ret;
+}
+
+static void vc4_dpi_unbind(struct device *dev, struct device *master,
+ void *data)
+{
+ struct drm_device *drm = dev_get_drvdata(master);
+ struct vc4_dev *vc4 = to_vc4_dev(drm);
+ struct vc4_dpi *dpi = dev_get_drvdata(dev);
+
+ if (dpi->panel)
+ drm_panel_detach(dpi->panel);
+
+ vc4_dpi_connector_destroy(dpi->connector);
+ drm_encoder_cleanup(dpi->encoder);
+
+ clk_disable_unprepare(dpi->core_clock);
+
+ vc4->dpi = NULL;
+}
+
+static const struct component_ops vc4_dpi_ops = {
+ .bind = vc4_dpi_bind,
+ .unbind = vc4_dpi_unbind,
+};
+
+static int vc4_dpi_dev_probe(struct platform_device *pdev)
+{
+ return component_add(&pdev->dev, &vc4_dpi_ops);
+}
+
+static int vc4_dpi_dev_remove(struct platform_device *pdev)
+{
+ component_del(&pdev->dev, &vc4_dpi_ops);
+ return 0;
+}
+
+struct platform_driver vc4_dpi_driver = {
+ .probe = vc4_dpi_dev_probe,
+ .remove = vc4_dpi_dev_remove,
+ .driver = {
+ .name = "vc4_dpi",
+ .of_match_table = vc4_dpi_dt_match,
+ },
+};
projects / karo-tx-linux.git / commitdiff