drm/bridge: Add PTN3460 bridge driver
This patch adds a drm_bridge driver for the PTN3460 DisplayPort to LVDS bridge chip. Signed-off-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Inki Dae <inki.dae@samsung.com>
Цей коміт міститься в:
Sean Paul
4
drivers/gpu/drm/bridge/Kconfig
Звичайний файл
4
drivers/gpu/drm/bridge/Kconfig
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@@ -0,0 +1,4 @@
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config DRM_PTN3460
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tristate "PTN3460 DP/LVDS bridge"
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depends on DRM && I2C
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---help---
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3
drivers/gpu/drm/bridge/Makefile
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3
drivers/gpu/drm/bridge/Makefile
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@@ -0,0 +1,3 @@
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ccflags-y := -Iinclude/drm
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obj-$(CONFIG_DRM_PTN3460) += ptn3460.o
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349
drivers/gpu/drm/bridge/ptn3460.c
Звичайний файл
349
drivers/gpu/drm/bridge/ptn3460.c
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@@ -0,0 +1,349 @@
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/*
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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/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/i2c.h>
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#include <linux/gpio.h>
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#include <linux/delay.h>
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#include "drmP.h"
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#include "drm_edid.h"
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#include "drm_crtc.h"
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#include "drm_crtc_helper.h"
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#include "bridge/ptn3460.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_encoder *encoder;
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struct drm_bridge *bridge;
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struct edid *edid;
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int gpio_pd_n;
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int 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 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->driver_private;
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int ret;
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if (ptn_bridge->enabled)
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return;
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if (gpio_is_valid(ptn_bridge->gpio_pd_n))
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gpio_set_value(ptn_bridge->gpio_pd_n, 1);
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if (gpio_is_valid(ptn_bridge->gpio_rst_n)) {
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gpio_set_value(ptn_bridge->gpio_rst_n, 0);
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udelay(10);
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gpio_set_value(ptn_bridge->gpio_rst_n, 1);
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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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}
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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->driver_private;
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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 (gpio_is_valid(ptn_bridge->gpio_rst_n))
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gpio_set_value(ptn_bridge->gpio_rst_n, 1);
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if (gpio_is_valid(ptn_bridge->gpio_pd_n))
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gpio_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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}
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void ptn3460_bridge_destroy(struct drm_bridge *bridge)
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{
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struct ptn3460_bridge *ptn_bridge = bridge->driver_private;
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drm_bridge_cleanup(bridge);
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if (gpio_is_valid(ptn_bridge->gpio_pd_n))
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gpio_free(ptn_bridge->gpio_pd_n);
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if (gpio_is_valid(ptn_bridge->gpio_rst_n))
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gpio_free(ptn_bridge->gpio_rst_n);
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/* Nothing else to free, we've got devm allocated memory */
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}
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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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.destroy = ptn3460_bridge_destroy,
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};
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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;
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bool power_off;
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ptn_bridge = container_of(connector, struct ptn3460_bridge, 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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num_modes = 0;
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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 int ptn3460_mode_valid(struct drm_connector *connector,
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struct drm_display_mode *mode)
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{
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return MODE_OK;
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}
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struct drm_encoder *ptn3460_best_encoder(struct drm_connector *connector)
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{
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struct ptn3460_bridge *ptn_bridge;
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ptn_bridge = container_of(connector, struct ptn3460_bridge, connector);
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return ptn_bridge->encoder;
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}
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struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
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.get_modes = ptn3460_get_modes,
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.mode_valid = ptn3460_mode_valid,
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.best_encoder = ptn3460_best_encoder,
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};
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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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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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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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int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder,
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struct i2c_client *client, struct device_node *node)
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{
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int ret;
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struct drm_bridge *bridge;
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struct ptn3460_bridge *ptn_bridge;
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bridge = devm_kzalloc(dev->dev, sizeof(*bridge), GFP_KERNEL);
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if (!bridge) {
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DRM_ERROR("Failed to allocate drm bridge\n");
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return -ENOMEM;
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}
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ptn_bridge = devm_kzalloc(dev->dev, sizeof(*ptn_bridge), GFP_KERNEL);
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if (!ptn_bridge) {
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DRM_ERROR("Failed to allocate ptn bridge\n");
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return -ENOMEM;
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}
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ptn_bridge->client = client;
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ptn_bridge->encoder = encoder;
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ptn_bridge->bridge = bridge;
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ptn_bridge->gpio_pd_n = of_get_named_gpio(node, "powerdown-gpio", 0);
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if (gpio_is_valid(ptn_bridge->gpio_pd_n)) {
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ret = gpio_request_one(ptn_bridge->gpio_pd_n,
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GPIOF_OUT_INIT_HIGH, "PTN3460_PD_N");
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if (ret) {
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DRM_ERROR("Request powerdown-gpio failed (%d)\n", ret);
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return ret;
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}
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}
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ptn_bridge->gpio_rst_n = of_get_named_gpio(node, "reset-gpio", 0);
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if (gpio_is_valid(ptn_bridge->gpio_rst_n)) {
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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 = gpio_request_one(ptn_bridge->gpio_rst_n,
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GPIOF_OUT_INIT_LOW, "PTN3460_RST_N");
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if (ret) {
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DRM_ERROR("Request reset-gpio failed (%d)\n", ret);
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gpio_free(ptn_bridge->gpio_pd_n);
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return ret;
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}
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}
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ret = of_property_read_u32(node, "edid-emulation",
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&ptn_bridge->edid_emulation);
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if (ret) {
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DRM_ERROR("Can't read edid emulation value\n");
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goto err;
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}
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ret = drm_bridge_init(dev, bridge, &ptn3460_bridge_funcs);
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if (ret) {
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DRM_ERROR("Failed to initialize bridge with drm\n");
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goto err;
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}
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bridge->driver_private = ptn_bridge;
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encoder->bridge = bridge;
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ret = drm_connector_init(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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goto err;
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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_sysfs_connector_add(&ptn_bridge->connector);
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drm_mode_connector_attach_encoder(&ptn_bridge->connector, encoder);
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return 0;
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err:
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if (gpio_is_valid(ptn_bridge->gpio_pd_n))
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gpio_free(ptn_bridge->gpio_pd_n);
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if (gpio_is_valid(ptn_bridge->gpio_rst_n))
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gpio_free(ptn_bridge->gpio_rst_n);
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return ret;
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}
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