2013/10/3 Sean Paul <seanpaul@xxxxxxxxxxxx>:
> On Thu, Oct 3, 2013 at 9:55 AM, Inki Dae <inki.dae@xxxxxxxxxxx> wrote:
>> Hi, thank you for your contribution and the below is my short comments,
>>
>> 2013/10/2 Sean Paul <seanpaul@xxxxxxxxxxxx>:
>>> This patch adds a drm_bridge driver for the PTN3460 DisplayPort to LVDS
>>> bridge chip.
>>>
>>> Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
>>> ---
>>> .../devicetree/bindings/drm/bridge/ptn3460.txt | 27 ++
>>> drivers/gpu/drm/Kconfig | 2 +
>>> drivers/gpu/drm/Makefile | 1 +
>>> drivers/gpu/drm/bridge/Kconfig | 4 +
>>> drivers/gpu/drm/bridge/Makefile | 3 +
>>> drivers/gpu/drm/bridge/ptn3460.c | 349 +++++++++++++++++++++
>>> include/drm/bridge/ptn3460.h | 36 +++
>>> 7 files changed, 422 insertions(+)
>>> create mode 100644 Documentation/devicetree/bindings/drm/bridge/ptn3460.txt
>>> create mode 100644 drivers/gpu/drm/bridge/Kconfig
>>> create mode 100644 drivers/gpu/drm/bridge/Makefile
>>> create mode 100644 drivers/gpu/drm/bridge/ptn3460.c
>>> create mode 100644 include/drm/bridge/ptn3460.h
>>>
>>> diff --git a/Documentation/devicetree/bindings/drm/bridge/ptn3460.txt b/Documentation/devicetree/bindings/drm/bridge/ptn3460.txt
>>> new file mode 100644
>>> index 0000000..c1cd329
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/drm/bridge/ptn3460.txt
>>> @@ -0,0 +1,27 @@
>>> +ptn3460-bridge bindings
>>> +
>>> +Required properties:
>>> + - compatible: "nxp,ptn3460"
>>> + - reg: i2c address of the bridge
>>> + - powerdown-gpio: OF device-tree gpio specification
>>
>> Can a regulator be used instead of gpio in other board case?
>>
>
> No, not to my knowledge.
>
Hm.. plz check it out again. the gpio pin is specific to board, and
the the gpio be used as power source trigger could be replaced with a
regulator according to board design. So you should consider all
possibilities even though there are no other cases yet: other board
could use a regulator instead.
>
>>> + - reset-gpio: 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:
>>> + ptn3460-bridge@20 {
>>> + compatible = "nxp,ptn3460";
>>> + reg = <0x20>;
>>> + powerdown-gpio = <&gpy2 5 1 0 0>;
>>> + reset-gpio = <&gpx1 5 1 0 0>;
>>> + edid-emulation = <5>;
>>> + };
>>> diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
>>> index 955555d..cd7bfb3 100644
>>> --- a/drivers/gpu/drm/Kconfig
>>> +++ b/drivers/gpu/drm/Kconfig
>>> @@ -236,3 +236,5 @@ source "drivers/gpu/drm/tilcdc/Kconfig"
>>> source "drivers/gpu/drm/qxl/Kconfig"
>>>
>>> source "drivers/gpu/drm/msm/Kconfig"
>>> +
>>> +source "drivers/gpu/drm/bridge/Kconfig"
>>> diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
>>> index f089adf..9234253 100644
>>> --- a/drivers/gpu/drm/Makefile
>>> +++ b/drivers/gpu/drm/Makefile
>>> @@ -56,3 +56,4 @@ obj-$(CONFIG_DRM_TILCDC) += tilcdc/
>>> obj-$(CONFIG_DRM_QXL) += qxl/
>>> obj-$(CONFIG_DRM_MSM) += msm/
>>> obj-y += i2c/
>>> +obj-y += bridge/
>>> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
>>> new file mode 100644
>>> index 0000000..f8db069
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/bridge/Kconfig
>>> @@ -0,0 +1,4 @@
>>> +config DRM_PTN3460
>>> + tristate "PTN3460 DP/LVDS bridge"
>>> + depends on DRM && I2C
>>> + ---help---
>>> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
>>> new file mode 100644
>>> index 0000000..b4733e1
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/bridge/Makefile
>>> @@ -0,0 +1,3 @@
>>> +ccflags-y := -Iinclude/drm
>>> +
>>> +obj-$(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..a9e5c1a
>>> --- /dev/null
>>> +++ b/drivers/gpu/drm/bridge/ptn3460.c
>>> @@ -0,0 +1,349 @@
>>> +/*
>>> + * 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 "drmP.h"
>>> +#include "drm_edid.h"
>>> +#include "drm_crtc.h"
>>> +#include "drm_crtc_helper.h"
>>> +
>>> +#include "bridge/ptn3460.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_encoder *encoder;
>>> + struct drm_bridge *bridge;
>>> + struct edid *edid;
>>> + int gpio_pd_n;
>>> + int 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;
>>> +
>>> + if (gpio_is_valid(ptn_bridge->gpio_pd_n))
>>> + gpio_set_value(ptn_bridge->gpio_pd_n, 1);
>>
>> Ditto.
>>
>>> +
>>> + if (gpio_is_valid(ptn_bridge->gpio_rst_n)) {
>>> + gpio_set_value(ptn_bridge->gpio_rst_n, 0);
>>> + udelay(10);
>>> + gpio_set_value(ptn_bridge->gpio_rst_n, 1);
>>> + }
>>> +
>>> + /*
>>> + * 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)
>>> +{
>>> +}
>>> +
>>> +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;
>>> +
>>> + if (gpio_is_valid(ptn_bridge->gpio_rst_n))
>>> + gpio_set_value(ptn_bridge->gpio_rst_n, 1);
>>> +
>>> + if (gpio_is_valid(ptn_bridge->gpio_pd_n))
>>> + gpio_set_value(ptn_bridge->gpio_pd_n, 0);
>>
>> Ditto.
>>
>>> +}
>>> +
>>> +static void ptn3460_post_disable(struct drm_bridge *bridge)
>>> +{
>>> +}
>>> +
>>> +void ptn3460_bridge_destroy(struct drm_bridge *bridge)
>>> +{
>>> + struct ptn3460_bridge *ptn_bridge = bridge->driver_private;
>>> +
>>> + drm_bridge_cleanup(bridge);
>>> + if (gpio_is_valid(ptn_bridge->gpio_pd_n))
>>> + gpio_free(ptn_bridge->gpio_pd_n);
>>
>> Ditto.
>>
>>> + if (gpio_is_valid(ptn_bridge->gpio_rst_n))
>>> + gpio_free(ptn_bridge->gpio_rst_n);
>>> + /* Nothing else to free, we've got devm allocated memory */
>>> +}
>>> +
>>> +struct drm_bridge_funcs ptn3460_bridge_funcs = {
>>> + .pre_enable = ptn3460_pre_enable,
>>> + .enable = ptn3460_enable,
>>> + .disable = ptn3460_disable,
>>> + .post_disable = ptn3460_post_disable,
>>> + .destroy = ptn3460_bridge_destroy,
>>> +};
>>> +
>>> +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;
>>> +}
>>> +
>>> +static int ptn3460_mode_valid(struct drm_connector *connector,
>>> + struct drm_display_mode *mode)
>>> +{
>>> + return MODE_OK;
>>> +}
>>> +
>>> +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->encoder;
>>> +}
>>> +
>>> +struct drm_connector_helper_funcs ptn3460_connector_helper_funcs = {
>>> + .get_modes = ptn3460_get_modes,
>>> + .mode_valid = ptn3460_mode_valid,
>>> + .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,
>>> +};
>>
>> Why do you try to add a new connector here? We already have the
>> connector for LCD, and also provides some callbacks for it. For this,
>> please see exynos_drm_display_ops of exynos_drm_fimd driver, and you
>> can add new callbacks to there such as init callback for bridge device
>> initialization if needed.
>>
>
> We add a new connector for 2 reasons:
>
> 1) We need to override the drm detect() callback to always return true
> since the DP driver will presumably return its hotplug status which
> will always be low when the ptn chip is turned off.
> 2) We want the ability to control the result of get_modes().
>
> I've got a patch set almost ready to tear the display ops out of fimd
> and put them in the DP driver.
Really? if so, that is ideal something we want and we should go. But
isn't the DP driver placed in drivers/video/exynos? How did you take
care of that? Actually, for this, we planned to use CDF(Common Display
Framework) if the framework is merged to mainline somehow.
> The display ops are better suited
> there, since it's the actual encoder/connector. I hope to get that
> posted this week.
>
I will look forward to that posting. :)
>
>>> +
>>> +int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder,
>>> + struct i2c_client *client, struct device_node *node)
>>> +{
>>> + int ret;
>>> + struct drm_bridge *bridge;
>>> + struct ptn3460_bridge *ptn_bridge;
>>> +
>>> + bridge = devm_kzalloc(dev->dev, sizeof(*bridge), GFP_KERNEL);
>>> + if (!bridge) {
>>> + DRM_ERROR("Failed to allocate drm bridge\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + ptn_bridge = devm_kzalloc(dev->dev, sizeof(*ptn_bridge), GFP_KERNEL);
>>> + if (!ptn_bridge) {
>>> + DRM_ERROR("Failed to allocate ptn bridge\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + ptn_bridge->client = client;
>>> + ptn_bridge->encoder = encoder;
>>> + ptn_bridge->bridge = bridge;
>>> + ptn_bridge->gpio_pd_n = of_get_named_gpio(node, "powerdown-gpio", 0);
>>
>> Also, if a regulator is used instead?
>>
>>> + if (gpio_is_valid(ptn_bridge->gpio_pd_n)) {
>>> + ret = gpio_request_one(ptn_bridge->gpio_pd_n,
>>> + GPIOF_OUT_INIT_HIGH, "PTN3460_PD_N");
>>> + if (ret) {
>>> + DRM_ERROR("Request powerdown-gpio failed (%d)\n", ret);
>>> + return ret;
>>> + }
>>> + }
>>> +
>>> + ptn_bridge->gpio_rst_n = of_get_named_gpio(node, "reset-gpio", 0);
>>> + if (gpio_is_valid(ptn_bridge->gpio_rst_n)) {
>>> + /*
>>> + * Request the reset pin low to avoid the bridge being
>>> + * initialized prematurely
>>> + */
>>> + ret = gpio_request_one(ptn_bridge->gpio_rst_n,
>>> + GPIOF_OUT_INIT_LOW, "PTN3460_RST_N");
>>> + if (ret) {
>>> + DRM_ERROR("Request reset-gpio failed (%d)\n", ret);
>>> + gpio_free(ptn_bridge->gpio_pd_n);
>>> + return ret;
>>> + }
>>> + }
>>> +
>>> + ret = of_property_read_u32(node, "edid-emulation",
>>> + &ptn_bridge->edid_emulation);
>>> + if (ret) {
>>> + DRM_ERROR("Can't read edid emulation value\n");
>>> + goto err;
>>> + }
>>> +
>>> + ret = drm_bridge_init(dev, bridge, &ptn3460_bridge_funcs);
>>> + if (ret) {
>>> + DRM_ERROR("Failed to initialize bridge with drm\n");
>>> + goto err;
>>> + }
>>> +
>>> + bridge->driver_private = ptn_bridge;
>>> + encoder->bridge = bridge;
>>> +
>>> + ret = drm_connector_init(dev, &ptn_bridge->connector,
>>> + &ptn3460_connector_funcs, DRM_MODE_CONNECTOR_LVDS);
>>
>> So it seems that here's not right place to call drm_connector_init function.
>>
>> Display pipeline path could be one of,
>> Display Controller Display bus
>> ---------------------------------------------------------------------------
>> FIMD---------------------LVDS--------------------LCD,
>> or
>> FIMD----------------------eDP---------------------LCD,
>> or
>> FIMD------------------MIPI-DSI------------------LCD,
>> or
>> FIMD-------------------------------------------------LCD
>>
>> And also in case using image enhancement chip,
>> mDNIe-------------FIMD-LITE between Display Controller and Display
>> bus.
>>
>> So, wouldn't the right place below FIMD driver? :)
>>
>
> Well, this driver should be considered outside of exynos context since
> it could be used by any drm driver.
>
> In the exynos context, the right place to implement it would be in the
> dp driver, actually. However, the exynos driver has a level of
> abstraction on top of the crtcs/encoders such that we need to
> initialize it in the exynos_drm_core. The patchset I mentioned above
> should help move things in a direction where fimd/mixer implement
> drm_crtc directly and hdmi/dp implement drm_encoder/drm_connector
> directly. In that world, DP would initialize the ptn driver.
>
>>
>>> + if (ret) {
>>> + DRM_ERROR("Failed to initialize connector with drm\n");
>>> + goto err;
>>> + }
>>> + drm_connector_helper_add(&ptn_bridge->connector,
>>> + &ptn3460_connector_helper_funcs);
>>> + drm_sysfs_connector_add(&ptn_bridge->connector);
>>> + drm_mode_connector_attach_encoder(&ptn_bridge->connector, encoder);
>>> +
>>> + return 0;
>>> +
>>> +err:
>>> + if (gpio_is_valid(ptn_bridge->gpio_pd_n))
>>> + gpio_free(ptn_bridge->gpio_pd_n);
>>> + if (gpio_is_valid(ptn_bridge->gpio_rst_n))
>>> + gpio_free(ptn_bridge->gpio_rst_n);
>>> + return ret;
>>> +}
>>> diff --git a/include/drm/bridge/ptn3460.h b/include/drm/bridge/ptn3460.h
>>> new file mode 100644
>>> index 0000000..157ffa1
>>> --- /dev/null
>>> +++ b/include/drm/bridge/ptn3460.h
>>> @@ -0,0 +1,36 @@
>>> +/*
>>> + * 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.
>>> + */
>>> +
>>> +#ifndef _DRM_BRIDGE_PTN3460_H_
>>> +#define _DRM_BRIDGE_PTN3460_H_
>>> +
>>> +struct drm_device;
>>> +struct drm_encoder;
>>> +struct i2c_client;
>>> +struct device_node;
>>> +
>>> +#ifdef CONFIG_DRM_PTN3460
>>> +
>>> +int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder,
>>> + struct i2c_client *client, struct device_node *node);
>>> +#else
>>> +
>>> +int ptn3460_init(struct drm_device *dev, struct drm_encoder *encoder,
>>> + struct i2c_client *client, struct device_node *node)
>>> +{
>>> + return 0;
>>> +}
>>> +
>>> +#endif
>>> +
>>> +#endif
>>> --
>>> 1.8.4
>>>
>>>
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