[PATCH V2 7/8] drm/bridge: Add i2c based driver for ptn3460 bridge
Ajay Kumar
ajaykumar.rs at samsung.com
Fri Jul 25 12:22:09 PDT 2014
From: Sean Paul <seanpaul at chromium.org>
This patch adds ptn3460 as module_i2c_driver.
Signed-off-by: Sean Paul <seanpaul at chromium.org>
Signed-off-by: Ajay Kumar <ajaykumar.rs at samsung.com>
---
.../devicetree/bindings/video/bridge/ptn3460.txt | 27 ++
drivers/gpu/drm/bridge/Kconfig | 10 +
drivers/gpu/drm/bridge/Makefile | 2 +
drivers/gpu/drm/bridge/ptn3460.c | 405 ++++++++++++++++++++
4 files changed, 444 insertions(+)
create mode 100644 Documentation/devicetree/bindings/video/bridge/ptn3460.txt
create mode 100644 drivers/gpu/drm/bridge/ptn3460.c
diff --git a/Documentation/devicetree/bindings/video/bridge/ptn3460.txt b/Documentation/devicetree/bindings/video/bridge/ptn3460.txt
new file mode 100644
index 0000000..03366c4
--- /dev/null
+++ b/Documentation/devicetree/bindings/video/bridge/ptn3460.txt
@@ -0,0 +1,27 @@
+ptn3460 bridge bindings
+
+Required properties:
+ - compatible: "nxp,ptn3460"
+ - reg: i2c address of the bridge
+ - powerdown-gpios: OF device-tree gpio specification
+ - reset-gpios: OF device-tree gpio specification
+ - edid-emulation: The EDID emulation entry to use
+ +-------+------------+------------------+
+ | Value | Resolution | Description |
+ | 0 | 1024x768 | NXP Generic |
+ | 1 | 1920x1080 | NXP Generic |
+ | 2 | 1920x1080 | NXP Generic |
+ | 3 | 1600x900 | Samsung LTM200KT |
+ | 4 | 1920x1080 | Samsung LTM230HT |
+ | 5 | 1366x768 | NXP Generic |
+ | 6 | 1600x900 | ChiMei M215HGE |
+ +-------+------------+------------------+
+
+Example:
+ lvds-bridge at 20 {
+ compatible = "nxp,ptn3460";
+ reg = <0x20>;
+ powerdown-gpios = <&gpy2 5 1 0 0>;
+ reset-gpios = <&gpx1 5 1 0 0>;
+ edid-emulation = <5>;
+ };
diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 1e2f96c..0b12d16 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -6,4 +6,14 @@ config DRM_BRIDGE
menu "bridge chips"
depends on DRM_BRIDGE
+
+config DRM_PTN3460
+ tristate "NXP ptn3460 eDP/LVDS bridge"
+ depends on DRM && DRM_BRIDGE
+ depends on OF
+ depends on I2C
+ select DRM_PANEL
+ help
+ ptn3460 eDP-LVDS bridge chip driver.
+
endmenu
diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
index be16eca..b4733e1 100644
--- a/drivers/gpu/drm/bridge/Makefile
+++ b/drivers/gpu/drm/bridge/Makefile
@@ -1 +1,3 @@
ccflags-y := -Iinclude/drm
+
+obj-$(CONFIG_DRM_PTN3460) += ptn3460.o
diff --git a/drivers/gpu/drm/bridge/ptn3460.c b/drivers/gpu/drm/bridge/ptn3460.c
new file mode 100644
index 0000000..f41302a
--- /dev/null
+++ b/drivers/gpu/drm/bridge/ptn3460.c
@@ -0,0 +1,405 @@
+/*
+ * NXP PTN3460 DP/LVDS bridge driver
+ *
+ * Copyright (C) 2013 Google, Inc.
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/i2c.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <drm/drm_panel.h>
+
+#include "drmP.h"
+#include "drm_edid.h"
+#include "drm_crtc.h"
+#include "drm_crtc_helper.h"
+
+#define PTN3460_EDID_ADDR 0x0
+#define PTN3460_EDID_EMULATION_ADDR 0x84
+#define PTN3460_EDID_ENABLE_EMULATION 0
+#define PTN3460_EDID_EMULATION_SELECTION 1
+#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
+
+struct ptn3460_bridge {
+ struct drm_connector connector;
+ struct i2c_client *client;
+ struct drm_bridge *bridge;
+ struct drm_panel *panel;
+ struct edid *edid;
+ struct gpio_desc *gpio_pd_n;
+ struct gpio_desc *gpio_rst_n;
+ u32 edid_emulation;
+ bool enabled;
+};
+
+static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
+ u8 *buf, int len)
+{
+ int ret;
+
+ ret = i2c_master_send(ptn_bridge->client, &addr, 1);
+ if (ret <= 0) {
+ DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
+ return ret;
+ }
+
+ ret = i2c_master_recv(ptn_bridge->client, buf, len);
+ if (ret <= 0) {
+ DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
+ char val)
+{
+ int ret;
+ char buf[2];
+
+ buf[0] = addr;
+ buf[1] = val;
+
+ ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
+ if (ret <= 0) {
+ DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
+{
+ int ret;
+ char val;
+
+ /* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
+ ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
+ ptn_bridge->edid_emulation);
+ if (ret) {
+ DRM_ERROR("Failed to transfer edid to sram, ret=%d\n", ret);
+ return ret;
+ }
+
+ /* Enable EDID emulation and select the desired EDID */
+ val = 1 << PTN3460_EDID_ENABLE_EMULATION |
+ ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;
+
+ ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
+ if (ret) {
+ DRM_ERROR("Failed to write edid value, ret=%d\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static void ptn3460_pre_enable(struct drm_bridge *bridge)
+{
+ struct ptn3460_bridge *ptn_bridge = bridge->driver_private;
+ int ret;
+
+ if (ptn_bridge->enabled)
+ return;
+
+ gpiod_set_value(ptn_bridge->gpio_pd_n, 1);
+
+ gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
+ udelay(10);
+ gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
+
+ drm_panel_prepare(ptn_bridge->panel);
+
+ /*
+ * There's a bug in the PTN chip where it falsely asserts hotplug before
+ * it is fully functional. We're forced to wait for the maximum start up
+ * time specified in the chip's datasheet to make sure we're really up.
+ */
+ msleep(90);
+
+ ret = ptn3460_select_edid(ptn_bridge);
+ if (ret)
+ DRM_ERROR("Select edid failed ret=%d\n", ret);
+
+ ptn_bridge->enabled = true;
+}
+
+static void ptn3460_enable(struct drm_bridge *bridge)
+{
+ struct ptn3460_bridge *ptn_bridge = bridge->driver_private;
+
+ drm_panel_enable(ptn_bridge->panel);
+}
+
+static void ptn3460_disable(struct drm_bridge *bridge)
+{
+ struct ptn3460_bridge *ptn_bridge = bridge->driver_private;
+
+ if (!ptn_bridge->enabled)
+ return;
+
+ ptn_bridge->enabled = false;
+
+ drm_panel_disable(ptn_bridge->panel);
+
+ gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
+ gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
+}
+
+static void ptn3460_post_disable(struct drm_bridge *bridge)
+{
+ struct ptn3460_bridge *ptn_bridge = bridge->driver_private;
+
+ drm_panel_unprepare(ptn_bridge->panel);
+}
+
+void ptn3460_bridge_destroy(struct drm_bridge *bridge)
+{
+ drm_bridge_cleanup(bridge);
+}
+
+int ptn3460_get_modes(struct drm_connector *connector)
+{
+ struct ptn3460_bridge *ptn_bridge;
+ u8 *edid;
+ int ret, num_modes;
+ bool power_off;
+
+ ptn_bridge = container_of(connector, struct ptn3460_bridge, connector);
+
+ if (ptn_bridge->edid)
+ return drm_add_edid_modes(connector, ptn_bridge->edid);
+
+ power_off = !ptn_bridge->enabled;
+ ptn3460_pre_enable(ptn_bridge->bridge);
+
+ edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
+ if (!edid) {
+ DRM_ERROR("Failed to allocate edid\n");
+ return 0;
+ }
+
+ ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
+ EDID_LENGTH);
+ if (ret) {
+ kfree(edid);
+ num_modes = 0;
+ goto out;
+ }
+
+ ptn_bridge->edid = (struct edid *)edid;
+ drm_mode_connector_update_edid_property(connector, ptn_bridge->edid);
+
+ num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
+
+out:
+ if (power_off)
+ ptn3460_disable(ptn_bridge->bridge);
+
+ return num_modes;
+}
+
+struct drm_encoder *ptn3460_best_encoder(struct drm_connector *connector)
+{
+ struct ptn3460_bridge *ptn_bridge;
+
+ ptn_bridge = container_of(connector, struct ptn3460_bridge, connector);
+
+ return ptn_bridge->bridge->encoder;
+}
+
+struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
+ .get_modes = ptn3460_get_modes,
+ .best_encoder = ptn3460_best_encoder,
+};
+
+enum drm_connector_status ptn3460_detect(struct drm_connector *connector,
+ bool force)
+{
+ return connector_status_connected;
+}
+
+void ptn3460_connector_destroy(struct drm_connector *connector)
+{
+ drm_connector_cleanup(connector);
+}
+
+struct drm_connector_funcs ptn3460_connector_funcs = {
+ .dpms = drm_helper_connector_dpms,
+ .fill_modes = drm_helper_probe_single_connector_modes,
+ .detect = ptn3460_detect,
+ .destroy = ptn3460_connector_destroy,
+};
+
+int ptn3460_post_encoder_init(struct drm_bridge *bridge)
+{
+ struct ptn3460_bridge *ptn_bridge = bridge->driver_private;
+ int ret;
+
+ /* bridge is attached to encoder.
+ * safe to remove it from the bridge_lookup table.
+ */
+ drm_bridge_remove_from_lookup(bridge);
+
+ ret = drm_bridge_init(bridge->drm_dev, bridge);
+ if (ret) {
+ DRM_ERROR("Failed to initialize bridge with drm\n");
+ return ret;
+ }
+
+ /* connector implementation */
+ ptn_bridge->connector.polled = bridge->connector_polled;
+
+ ret = drm_connector_init(bridge->drm_dev, &ptn_bridge->connector,
+ &ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
+ if (ret) {
+ DRM_ERROR("Failed to initialize connector with drm\n");
+ return ret;
+ }
+ drm_connector_helper_add(&ptn_bridge->connector,
+ &ptn3460_connector_helper_funcs);
+ drm_connector_register(&ptn_bridge->connector);
+ drm_mode_connector_attach_encoder(&ptn_bridge->connector,
+ bridge->encoder);
+
+ if (ptn_bridge->panel)
+ drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
+
+ return ret;
+}
+
+struct drm_bridge_funcs ptn3460_bridge_funcs = {
+ .post_encoder_init = ptn3460_post_encoder_init,
+ .pre_enable = ptn3460_pre_enable,
+ .enable = ptn3460_enable,
+ .disable = ptn3460_disable,
+ .post_disable = ptn3460_post_disable,
+ .destroy = ptn3460_bridge_destroy,
+};
+
+static int ptn3460_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &(client->dev);
+ struct device_node *panel_node;
+ struct drm_bridge *bridge;
+ struct ptn3460_bridge *ptn_bridge;
+ int ret;
+
+ bridge = devm_kzalloc(dev, sizeof(*bridge), GFP_KERNEL);
+ if (!bridge) {
+ DRM_ERROR("Failed to allocate drm bridge\n");
+ return -ENOMEM;
+ }
+
+ ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
+ if (!ptn_bridge) {
+ DRM_ERROR("Failed to allocate ptn bridge\n");
+ return -ENOMEM;
+ }
+
+ panel_node = of_parse_phandle(dev->of_node, "panel", 0);
+ if (panel_node) {
+ ptn_bridge->panel = of_drm_find_panel(panel_node);
+ of_node_put(panel_node);
+ if (!ptn_bridge->panel)
+ return -EPROBE_DEFER;
+ }
+
+ bridge->dev = dev;
+ bridge->driver_private = ptn_bridge;
+ bridge->funcs = &ptn3460_bridge_funcs;
+
+ ptn_bridge->client = client;
+ ptn_bridge->bridge = bridge;
+
+ ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown");
+ if (IS_ERR(ptn_bridge->gpio_pd_n)) {
+ ret = PTR_ERR(ptn_bridge->gpio_pd_n);
+ DRM_ERROR("cannot get gpio_pd_n %d\n", ret);
+ return ret;
+ } else {
+ ret = gpiod_direction_output(ptn_bridge->gpio_pd_n, 1);
+ if (ret) {
+ DRM_ERROR("cannot configure gpio_pd_n\n");
+ return ret;
+ }
+ }
+
+ ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset");
+ if (IS_ERR(ptn_bridge->gpio_rst_n)) {
+ ret = PTR_ERR(ptn_bridge->gpio_rst_n);
+ DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
+ return ret;
+ } else {
+ /*
+ * Request the reset pin low to avoid the bridge being
+ * initialized prematurely
+ */
+ ret = gpiod_direction_output(ptn_bridge->gpio_rst_n, 0);
+ if (ret) {
+ DRM_ERROR("cannot configure gpio_pd_n\n");
+ return ret;
+ }
+ }
+
+ ret = of_property_read_u32(dev->of_node, "edid-emulation",
+ &ptn_bridge->edid_emulation);
+ if (ret) {
+ DRM_ERROR("Can't read edid emulation value\n");
+ return -ENODEV;
+ }
+
+ i2c_set_clientdata(client, ptn_bridge);
+
+ drm_bridge_add_for_lookup(bridge);
+
+ return 0;
+}
+
+static int ptn3460_remove(struct i2c_client *client)
+{
+ return 0;
+}
+
+static const struct i2c_device_id ptn3460_i2c_table[] = {
+ {"nxp,ptn3460", 0},
+ {},
+};
+MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
+
+static const struct of_device_id ptn3460_match[] = {
+ { .compatible = "nxp,ptn3460" },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ptn3460_match);
+
+struct i2c_driver ptn3460_driver = {
+ .id_table = ptn3460_i2c_table,
+ .probe = ptn3460_probe,
+ .remove = ptn3460_remove,
+ .driver = {
+ .name = "nxp,ptn3460",
+ .owner = THIS_MODULE,
+ .of_match_table = of_match_ptr(ptn3460_match),
+ },
+};
+module_i2c_driver(ptn3460_driver);
+
+MODULE_AUTHOR("Sean Paul <seanpaul at chromium.org>");
+MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
+MODULE_LICENSE("GPL");
--
1.7.9.5
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