418 lines
10 KiB
C
418 lines
10 KiB
C
/*
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* NXP PTN3460 DP/LVDS bridge driver
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*
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* Copyright (C) 2013 Google, Inc.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/delay.h>
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#include <linux/gpio.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/of_gpio.h>
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#include <linux/of_graph.h>
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#include <drm/drm_panel.h>
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#include "bridge/ptn3460.h"
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#include "drm_crtc.h"
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#include "drm_crtc_helper.h"
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#include "drm_edid.h"
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#include "drmP.h"
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#define PTN3460_EDID_ADDR 0x0
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#define PTN3460_EDID_EMULATION_ADDR 0x84
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#define PTN3460_EDID_ENABLE_EMULATION 0
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#define PTN3460_EDID_EMULATION_SELECTION 1
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#define PTN3460_EDID_SRAM_LOAD_ADDR 0x85
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struct ptn3460_bridge {
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struct drm_connector connector;
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struct i2c_client *client;
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struct drm_bridge bridge;
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struct edid *edid;
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struct drm_panel *panel;
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struct gpio_desc *gpio_pd_n;
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struct gpio_desc *gpio_rst_n;
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u32 edid_emulation;
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bool enabled;
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};
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static inline struct ptn3460_bridge *
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bridge_to_ptn3460(struct drm_bridge *bridge)
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{
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return container_of(bridge, struct ptn3460_bridge, bridge);
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}
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static inline struct ptn3460_bridge *
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connector_to_ptn3460(struct drm_connector *connector)
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{
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return container_of(connector, struct ptn3460_bridge, connector);
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}
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static int ptn3460_read_bytes(struct ptn3460_bridge *ptn_bridge, char addr,
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u8 *buf, int len)
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{
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int ret;
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ret = i2c_master_send(ptn_bridge->client, &addr, 1);
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if (ret <= 0) {
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DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
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return ret;
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}
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ret = i2c_master_recv(ptn_bridge->client, buf, len);
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if (ret <= 0) {
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DRM_ERROR("Failed to recv i2c data, ret=%d\n", ret);
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return ret;
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}
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return 0;
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}
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static int ptn3460_write_byte(struct ptn3460_bridge *ptn_bridge, char addr,
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char val)
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{
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int ret;
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char buf[2];
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buf[0] = addr;
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buf[1] = val;
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ret = i2c_master_send(ptn_bridge->client, buf, ARRAY_SIZE(buf));
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if (ret <= 0) {
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DRM_ERROR("Failed to send i2c command, ret=%d\n", ret);
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return ret;
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}
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return 0;
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}
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static int ptn3460_select_edid(struct ptn3460_bridge *ptn_bridge)
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{
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int ret;
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char val;
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/* Load the selected edid into SRAM (accessed at PTN3460_EDID_ADDR) */
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ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_SRAM_LOAD_ADDR,
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ptn_bridge->edid_emulation);
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if (ret) {
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DRM_ERROR("Failed to transfer EDID to sram, ret=%d\n", ret);
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return ret;
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}
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/* Enable EDID emulation and select the desired EDID */
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val = 1 << PTN3460_EDID_ENABLE_EMULATION |
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ptn_bridge->edid_emulation << PTN3460_EDID_EMULATION_SELECTION;
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ret = ptn3460_write_byte(ptn_bridge, PTN3460_EDID_EMULATION_ADDR, val);
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if (ret) {
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DRM_ERROR("Failed to write EDID value, ret=%d\n", ret);
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return ret;
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}
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return 0;
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}
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static void ptn3460_pre_enable(struct drm_bridge *bridge)
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{
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struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
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int ret;
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if (ptn_bridge->enabled)
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return;
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gpiod_set_value(ptn_bridge->gpio_pd_n, 1);
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gpiod_set_value(ptn_bridge->gpio_rst_n, 0);
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usleep_range(10, 20);
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gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
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if (drm_panel_prepare(ptn_bridge->panel)) {
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DRM_ERROR("failed to prepare panel\n");
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return;
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}
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/*
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* There's a bug in the PTN chip where it falsely asserts hotplug before
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* it is fully functional. We're forced to wait for the maximum start up
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* time specified in the chip's datasheet to make sure we're really up.
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*/
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msleep(90);
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ret = ptn3460_select_edid(ptn_bridge);
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if (ret)
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DRM_ERROR("Select EDID failed ret=%d\n", ret);
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ptn_bridge->enabled = true;
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}
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static void ptn3460_enable(struct drm_bridge *bridge)
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{
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struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
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if (drm_panel_enable(ptn_bridge->panel)) {
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DRM_ERROR("failed to enable panel\n");
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return;
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}
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}
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static void ptn3460_disable(struct drm_bridge *bridge)
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{
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struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
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if (!ptn_bridge->enabled)
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return;
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ptn_bridge->enabled = false;
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if (drm_panel_disable(ptn_bridge->panel)) {
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DRM_ERROR("failed to disable panel\n");
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return;
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}
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gpiod_set_value(ptn_bridge->gpio_rst_n, 1);
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gpiod_set_value(ptn_bridge->gpio_pd_n, 0);
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}
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static void ptn3460_post_disable(struct drm_bridge *bridge)
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{
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struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
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if (drm_panel_unprepare(ptn_bridge->panel)) {
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DRM_ERROR("failed to unprepare panel\n");
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return;
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}
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}
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static int ptn3460_get_modes(struct drm_connector *connector)
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{
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struct ptn3460_bridge *ptn_bridge;
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u8 *edid;
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int ret, num_modes = 0;
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bool power_off;
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ptn_bridge = connector_to_ptn3460(connector);
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if (ptn_bridge->edid)
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return drm_add_edid_modes(connector, ptn_bridge->edid);
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power_off = !ptn_bridge->enabled;
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ptn3460_pre_enable(&ptn_bridge->bridge);
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edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
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if (!edid) {
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DRM_ERROR("Failed to allocate EDID\n");
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return 0;
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}
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ret = ptn3460_read_bytes(ptn_bridge, PTN3460_EDID_ADDR, edid,
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EDID_LENGTH);
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if (ret) {
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kfree(edid);
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goto out;
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}
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ptn_bridge->edid = (struct edid *)edid;
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drm_mode_connector_update_edid_property(connector, ptn_bridge->edid);
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num_modes = drm_add_edid_modes(connector, ptn_bridge->edid);
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out:
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if (power_off)
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ptn3460_disable(&ptn_bridge->bridge);
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return num_modes;
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}
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static struct drm_encoder *ptn3460_best_encoder(struct drm_connector *connector)
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{
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struct ptn3460_bridge *ptn_bridge = connector_to_ptn3460(connector);
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return ptn_bridge->bridge.encoder;
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}
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static struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
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.get_modes = ptn3460_get_modes,
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.best_encoder = ptn3460_best_encoder,
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};
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static enum drm_connector_status ptn3460_detect(struct drm_connector *connector,
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bool force)
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{
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return connector_status_connected;
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}
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static void ptn3460_connector_destroy(struct drm_connector *connector)
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{
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drm_connector_cleanup(connector);
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}
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static struct drm_connector_funcs ptn3460_connector_funcs = {
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.dpms = drm_helper_connector_dpms,
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.fill_modes = drm_helper_probe_single_connector_modes,
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.detect = ptn3460_detect,
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.destroy = ptn3460_connector_destroy,
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};
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static int ptn3460_bridge_attach(struct drm_bridge *bridge)
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{
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struct ptn3460_bridge *ptn_bridge = bridge_to_ptn3460(bridge);
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int ret;
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if (!bridge->encoder) {
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DRM_ERROR("Parent encoder object not found");
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return -ENODEV;
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}
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ptn_bridge->connector.polled = DRM_CONNECTOR_POLL_HPD;
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ret = drm_connector_init(bridge->dev, &ptn_bridge->connector,
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&ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
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if (ret) {
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DRM_ERROR("Failed to initialize connector with drm\n");
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return ret;
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}
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drm_connector_helper_add(&ptn_bridge->connector,
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&ptn3460_connector_helper_funcs);
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drm_connector_register(&ptn_bridge->connector);
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drm_mode_connector_attach_encoder(&ptn_bridge->connector,
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bridge->encoder);
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if (ptn_bridge->panel)
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drm_panel_attach(ptn_bridge->panel, &ptn_bridge->connector);
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drm_helper_hpd_irq_event(ptn_bridge->connector.dev);
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return ret;
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}
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static struct drm_bridge_funcs ptn3460_bridge_funcs = {
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.pre_enable = ptn3460_pre_enable,
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.enable = ptn3460_enable,
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.disable = ptn3460_disable,
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.post_disable = ptn3460_post_disable,
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.attach = ptn3460_bridge_attach,
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};
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static int ptn3460_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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struct ptn3460_bridge *ptn_bridge;
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struct device_node *endpoint, *panel_node;
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int ret;
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ptn_bridge = devm_kzalloc(dev, sizeof(*ptn_bridge), GFP_KERNEL);
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if (!ptn_bridge) {
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return -ENOMEM;
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}
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endpoint = of_graph_get_next_endpoint(dev->of_node, NULL);
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if (endpoint) {
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panel_node = of_graph_get_remote_port_parent(endpoint);
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if (panel_node) {
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ptn_bridge->panel = of_drm_find_panel(panel_node);
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of_node_put(panel_node);
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if (!ptn_bridge->panel)
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return -EPROBE_DEFER;
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}
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}
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ptn_bridge->client = client;
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ptn_bridge->gpio_pd_n = devm_gpiod_get(&client->dev, "powerdown");
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if (IS_ERR(ptn_bridge->gpio_pd_n)) {
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ret = PTR_ERR(ptn_bridge->gpio_pd_n);
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dev_err(dev, "cannot get gpio_pd_n %d\n", ret);
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return ret;
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}
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ret = gpiod_direction_output(ptn_bridge->gpio_pd_n, 1);
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if (ret) {
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DRM_ERROR("cannot configure gpio_pd_n\n");
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return ret;
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}
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ptn_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset");
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if (IS_ERR(ptn_bridge->gpio_rst_n)) {
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ret = PTR_ERR(ptn_bridge->gpio_rst_n);
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DRM_ERROR("cannot get gpio_rst_n %d\n", ret);
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return ret;
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}
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/*
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* Request the reset pin low to avoid the bridge being
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* initialized prematurely
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*/
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ret = gpiod_direction_output(ptn_bridge->gpio_rst_n, 0);
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if (ret) {
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DRM_ERROR("cannot configure gpio_rst_n\n");
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return ret;
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}
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ret = of_property_read_u32(dev->of_node, "edid-emulation",
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&ptn_bridge->edid_emulation);
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if (ret) {
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dev_err(dev, "Can't read EDID emulation value\n");
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return ret;
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}
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ptn_bridge->bridge.funcs = &ptn3460_bridge_funcs;
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ptn_bridge->bridge.of_node = dev->of_node;
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ret = drm_bridge_add(&ptn_bridge->bridge);
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if (ret) {
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DRM_ERROR("Failed to add bridge\n");
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return ret;
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}
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i2c_set_clientdata(client, ptn_bridge);
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return 0;
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}
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static int ptn3460_remove(struct i2c_client *client)
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{
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struct ptn3460_bridge *ptn_bridge = i2c_get_clientdata(client);
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drm_bridge_remove(&ptn_bridge->bridge);
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return 0;
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}
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static const struct i2c_device_id ptn3460_i2c_table[] = {
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{"nxp,ptn3460", 0},
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{},
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};
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MODULE_DEVICE_TABLE(i2c, ptn3460_i2c_table);
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static const struct of_device_id ptn3460_match[] = {
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{ .compatible = "nxp,ptn3460" },
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{},
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};
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MODULE_DEVICE_TABLE(of, ptn3460_match);
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static struct i2c_driver ptn3460_driver = {
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.id_table = ptn3460_i2c_table,
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.probe = ptn3460_probe,
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.remove = ptn3460_remove,
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.driver = {
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.name = "nxp,ptn3460",
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.owner = THIS_MODULE,
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.of_match_table = ptn3460_match,
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},
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};
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module_i2c_driver(ptn3460_driver);
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MODULE_AUTHOR("Sean Paul <seanpaul@chromium.org>");
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MODULE_DESCRIPTION("NXP ptn3460 eDP-LVDS converter driver");
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MODULE_LICENSE("GPL v2");
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