drm/bridge: Add RGB to VGA bridge support

Some boards have an entirely passive RGB to VGA bridge, based on DACs
implemented by resistor ladders.

Those might or might not have an i2c bus routed to the VGA connector in
order to access the screen EDIDs.

Add a bridge that doesn't do anything but expose the modes available on the
screen, either based on the EDIDs if available, or based on the XGA
standards.

Acked-by: Rob Herring <robh@kernel.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20160930143709.1388-3-maxime.ripard@free-electrons.com

3 files changed, 231 insertions, 0 deletions

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index b590e678052d..10e12e74fc9f 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -17,6 +17,13 @@ config DRM_ANALOGIX_ANX78XX
           the HDMI output of an application processor to MyDP
           or DisplayPort.
 
+config DRM_DUMB_VGA_DAC
+        tristate "Dumb VGA DAC Bridge support"
+        depends on OF
+        select DRM_KMS_HELPER
+        help
+          Support for RGB to VGA DAC based bridges
+
 config DRM_DW_HDMI
         tristate
         select DRM_KMS_HELPER
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index efdb07e878f5..cdf3a3cf765d 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -1,6 +1,7 @@
 ccflags-y := -Iinclude/drm
 
 obj-$(CONFIG_DRM_ANALOGIX_ANX78XX) += analogix-anx78xx.o
+obj-$(CONFIG_DRM_DUMB_VGA_DAC) += dumb-vga-dac.o
 obj-$(CONFIG_DRM_DW_HDMI) += dw-hdmi.o
 obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw-hdmi-ahb-audio.o
 obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
diff --git a/drivers/gpu/drm/bridge/dumb-vga-dac.c b/drivers/gpu/drm/bridge/dumb-vga-dac.c
new file mode 100644
index 000000000000..afec232185a7
--- /dev/null
+++ b/drivers/gpu/drm/bridge/dumb-vga-dac.c
@@ -0,0 +1,223 @@
+/*
+ * Copyright (C) 2015-2016 Free Electrons
+ * Copyright (C) 2015-2016 NextThing Co
+ *
+ * Maxime Ripard <maxime.ripard@free-electrons.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ */
+
+#include <linux/module.h>
+#include <linux/of_graph.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_crtc_helper.h>
+
+struct dumb_vga {
+        struct drm_bridge       bridge;
+        struct drm_connector    connector;
+
+        struct i2c_adapter      *ddc;
+};
+
+static inline struct dumb_vga *
+drm_bridge_to_dumb_vga(struct drm_bridge *bridge)
+{
+        return container_of(bridge, struct dumb_vga, bridge);
+}
+
+static inline struct dumb_vga *
+drm_connector_to_dumb_vga(struct drm_connector *connector)
+{
+        return container_of(connector, struct dumb_vga, connector);
+}
+
+static int dumb_vga_get_modes(struct drm_connector *connector)
+{
+        struct dumb_vga *vga = drm_connector_to_dumb_vga(connector);
+        struct edid *edid;
+        int ret;
+
+        if (IS_ERR(vga->ddc))
+                goto fallback;
+
+        edid = drm_get_edid(connector, vga->ddc);
+        if (!edid) {
+                DRM_INFO("EDID readout failed, falling back to standard modes\n");
+                goto fallback;
+        }
+
+        drm_mode_connector_update_edid_property(connector, edid);
+        return drm_add_edid_modes(connector, edid);
+
+fallback:
+        /*
+         * In case we cannot retrieve the EDIDs (broken or missing i2c
+         * bus), fallback on the XGA standards
+         */
+        ret = drm_add_modes_noedid(connector, 1920, 1200);
+
+        /* And prefer a mode pretty much anyone can handle */
+        drm_set_preferred_mode(connector, 1024, 768);
+
+        return ret;
+}
+
+static const struct drm_connector_helper_funcs dumb_vga_con_helper_funcs = {
+        .get_modes      = dumb_vga_get_modes,
+};
+
+static enum drm_connector_status
+dumb_vga_connector_detect(struct drm_connector *connector, bool force)
+{
+        struct dumb_vga *vga = drm_connector_to_dumb_vga(connector);
+
+        /*
+         * Even if we have an I2C bus, we can't assume that the cable
+         * is disconnected if drm_probe_ddc fails. Some cables don't
+         * wire the DDC pins, or the I2C bus might not be working at
+         * all.
+         */
+        if (!IS_ERR(vga->ddc) && drm_probe_ddc(vga->ddc))
+                return connector_status_connected;
+
+        return connector_status_unknown;
+}
+
+static const struct drm_connector_funcs dumb_vga_con_funcs = {
+        .dpms                   = drm_atomic_helper_connector_dpms,
+        .detect                 = dumb_vga_connector_detect,
+        .fill_modes             = drm_helper_probe_single_connector_modes,
+        .destroy                = drm_connector_cleanup,
+        .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 int dumb_vga_attach(struct drm_bridge *bridge)
+{
+        struct dumb_vga *vga = drm_bridge_to_dumb_vga(bridge);
+        int ret;
+
+        if (!bridge->encoder) {
+                DRM_ERROR("Missing encoder\n");
+                return -ENODEV;
+        }
+
+        drm_connector_helper_add(&vga->connector,
+                                 &dumb_vga_con_helper_funcs);
+        ret = drm_connector_init(bridge->dev, &vga->connector,
+                                 &dumb_vga_con_funcs, DRM_MODE_CONNECTOR_VGA);
+        if (ret) {
+                DRM_ERROR("Failed to initialize connector\n");
+                return ret;
+        }
+
+        drm_mode_connector_attach_encoder(&vga->connector,
+                                          bridge->encoder);
+
+        return 0;
+}
+
+static const struct drm_bridge_funcs dumb_vga_bridge_funcs = {
+        .attach         = dumb_vga_attach,
+};
+
+static struct i2c_adapter *dumb_vga_retrieve_ddc(struct device *dev)
+{
+        struct device_node *end_node, *phandle, *remote;
+        struct i2c_adapter *ddc;
+
+        end_node = of_graph_get_endpoint_by_regs(dev->of_node, 1, -1);
+        if (!end_node) {
+                dev_err(dev, "Missing connector endpoint\n");
+                return ERR_PTR(-ENODEV);
+        }
+
+        remote = of_graph_get_remote_port_parent(end_node);
+        of_node_put(end_node);
+        if (!remote) {
+                dev_err(dev, "Enable to parse remote node\n");
+                return ERR_PTR(-EINVAL);
+        }
+
+        phandle = of_parse_phandle(remote, "ddc-i2c-bus", 0);
+        of_node_put(remote);
+        if (!phandle)
+                return ERR_PTR(-ENODEV);
+
+        ddc = of_get_i2c_adapter_by_node(phandle);
+        of_node_put(phandle);
+        if (!ddc)
+                return ERR_PTR(-EPROBE_DEFER);
+
+        return ddc;
+}
+
+static int dumb_vga_probe(struct platform_device *pdev)
+{
+        struct dumb_vga *vga;
+        int ret;
+
+        vga = devm_kzalloc(&pdev->dev, sizeof(*vga), GFP_KERNEL);
+        if (!vga)
+                return -ENOMEM;
+        platform_set_drvdata(pdev, vga);
+
+        vga->ddc = dumb_vga_retrieve_ddc(&pdev->dev);
+        if (IS_ERR(vga->ddc)) {
+                if (PTR_ERR(vga->ddc) == -ENODEV) {
+                        dev_dbg(&pdev->dev,
+                                "No i2c bus specified. Disabling EDID readout\n");
+                } else {
+                        dev_err(&pdev->dev, "Couldn't retrieve i2c bus\n");
+                        return PTR_ERR(vga->ddc);
+                }
+        }
+
+        vga->bridge.funcs = &dumb_vga_bridge_funcs;
+        vga->bridge.of_node = pdev->dev.of_node;
+
+        ret = drm_bridge_add(&vga->bridge);
+        if (ret && !IS_ERR(vga->ddc))
+                i2c_put_adapter(vga->ddc);
+
+        return ret;
+}
+
+static int dumb_vga_remove(struct platform_device *pdev)
+{
+        struct dumb_vga *vga = platform_get_drvdata(pdev);
+
+        drm_bridge_remove(&vga->bridge);
+
+        if (!IS_ERR(vga->ddc))
+                i2c_put_adapter(vga->ddc);
+
+        return 0;
+}
+
+static const struct of_device_id dumb_vga_match[] = {
+        { .compatible = "dumb-vga-dac" },
+        {},
+};
+MODULE_DEVICE_TABLE(of, dumb_vga_match);
+
+static struct platform_driver dumb_vga_driver = {
+        .probe  = dumb_vga_probe,
+        .remove = dumb_vga_remove,
+        .driver         = {
+                .name           = "dumb-vga-dac",
+                .of_match_table = dumb_vga_match,
+        },
+};
+module_platform_driver(dumb_vga_driver);
+
+MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
+MODULE_DESCRIPTION("Dumb VGA DAC bridge driver");
+MODULE_LICENSE("GPL");