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Message-ID: <566FBE85.4060708@codeaurora.org>
Date: Tue, 15 Dec 2015 12:47:25 +0530
From: Archit Taneja <architt@...eaurora.org>
To: Jitao Shi <jitao.shi@...iatek.com>,
Rob Herring <robh+dt@...nel.org>,
Pawel Moll <pawel.moll@....com>,
Mark Rutland <mark.rutland@....com>,
Ian Campbell <ijc+devicetree@...lion.org.uk>,
Kumar Gala <galak@...eaurora.org>,
David Airlie <airlied@...ux.ie>,
Matthias Brugger <matthias.bgg@...il.com>
Cc: Thierry Reding <treding@...dia.com>,
Ajay Kumar <ajaykumar.rs@...sung.com>,
Inki Dae <inki.dae@...sung.com>,
Rahul Sharma <rahul.sharma@...sung.com>,
Sean Paul <seanpaul@...omium.org>,
Vincent Palatin <vpalatin@...omium.org>,
Andy Yan <andy.yan@...k-chips.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Russell King <rmk+kernel@....linux.org.uk>,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org, srv_heupstream@...iatek.com,
Sascha Hauer <kernel@...gutronix.de>,
yingjoe.chen@...iatek.com, eddie.huang@...iatek.com,
cawa.cheng@...iatek.com, bibby.hsieh@...iatek.com,
ck.hu@...iatek.com
Subject: Re: [PATCH v6 2/2] drm/bridge: Add I2C based driver for ps8640 bridge
Hi,
On 12/15/2015 09:00 AM, Jitao Shi wrote:
> This patch adds drm_bridge driver for parade DSI to eDP bridge chip.
>
> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
> ---
> Changes since v5
> -fix compile errors when CONFIG_GPIOLIB=n
> ---
> drivers/gpu/drm/bridge/Kconfig | 10 +
> drivers/gpu/drm/bridge/Makefile | 1 +
> drivers/gpu/drm/bridge/parade-ps8640.c | 472 ++++++++++++++++++++++++++++++++
> 3 files changed, 483 insertions(+)
> create mode 100644 drivers/gpu/drm/bridge/parade-ps8640.c
>
> diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
> index 6dddd39..dcfdbc9 100644
> --- a/drivers/gpu/drm/bridge/Kconfig
> +++ b/drivers/gpu/drm/bridge/Kconfig
> @@ -41,4 +41,14 @@ config DRM_PARADE_PS8622
> ---help---
> Parade eDP-LVDS bridge chip driver.
>
> +config DRM_PARADE_PS8640
> + tristate "Parade PS8640 MIPI DSI to eDP Converter"
> + depends on OF
> + select DRM_KMS_HELPER
> + select DRM_PANEL
> + ---help---
> + Choose this option if you have PS8640 for display
> + The PS8640 is a high-performance and low-power
> + MIPI DSI to eDP converter
> +
> endmenu
> diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile
> index d4e28be..272e3c01 100644
> --- a/drivers/gpu/drm/bridge/Makefile
> +++ b/drivers/gpu/drm/bridge/Makefile
> @@ -4,3 +4,4 @@ obj-$(CONFIG_DRM_DW_HDMI) += dw_hdmi.o
> obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw_hdmi-ahb-audio.o
> obj-$(CONFIG_DRM_NXP_PTN3460) += nxp-ptn3460.o
> obj-$(CONFIG_DRM_PARADE_PS8622) += parade-ps8622.o
> +obj-$(CONFIG_DRM_PARADE_PS8640) += parade-ps8640.o
> diff --git a/drivers/gpu/drm/bridge/parade-ps8640.c b/drivers/gpu/drm/bridge/parade-ps8640.c
> new file mode 100644
> index 0000000..bf0c3c37
> --- /dev/null
> +++ b/drivers/gpu/drm/bridge/parade-ps8640.c
> @@ -0,0 +1,472 @@
> +/*
> + * Copyright (c) 2014 MediaTek Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + *
> + * 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/delay.h>
> +#include <linux/err.h>
> +#include <linux/gpio.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/i2c.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_gpio.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <drm/drm_panel.h>
> +
> +#include <drmP.h>
> +#include <drm_crtc_helper.h>
> +#include <drm_crtc.h>
> +#include <drm_mipi_dsi.h>
This doesn't seem to be used at the moment.
<snip>
> +
> +static int ps8640_probe(struct i2c_client *client,
> + const struct i2c_device_id *id)
> +{
> + struct device *dev = &client->dev;
> + struct ps8640 *ps_bridge;
> + struct device_node *np = dev->of_node;
> + struct device_node *port, *out_ep;
> + struct device_node *panel_node = NULL;
> + int i, ret;
> +
> + ps_bridge = devm_kzalloc(dev, sizeof(*ps_bridge), GFP_KERNEL);
> + if (!ps_bridge)
> + return -ENOMEM;
> +
> + /* port@1 is ps8640 output port */
> + port = of_graph_get_port_by_id(np, 1);
> + if (port) {
> + out_ep = of_get_child_by_name(port, "endpoint");
> + of_node_put(port);
> + if (out_ep) {
> + panel_node = of_graph_get_remote_port_parent(out_ep);
> + of_node_put(out_ep);
> + }
> + }
> + if (panel_node) {
> + ps_bridge->panel = of_drm_find_panel(panel_node);
> + of_node_put(panel_node);
> + if (!ps_bridge->panel)
> + return -EPROBE_DEFER;
> + }
The driver retrieves the panel from the output port via DT, but doesn't
retrieve the DSI host from the input port?
Wouldn't this driver need to call a "mipi_dsi_attach" at some point to
link with the DSI host (and pass parameters like number of lanes, color
format etc)?
I've been working on a patchset[1] which lets i2c drivers create mipi
dsi devices. I think this would be needed for the ps8640 driver too.
[1] https://lkml.org/lkml/2015/12/10/283
Archit
> +
> + ps_bridge->page[0] = client;
> + for (i = 1; i < 6; i++)
> + ps_bridge->page[i] = i2c_new_dummy(client->adapter,
> + client->addr + i);
> +
> + ps_bridge->pwr_3v3_supply = devm_regulator_get(dev, "vdd33");
> + if (IS_ERR(ps_bridge->pwr_3v3_supply)) {
> + ret = PTR_ERR(ps_bridge->pwr_3v3_supply);
> + dev_err(dev, "cannot get vdd33 supply: %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->pwr_1v2_supply = devm_regulator_get(dev, "vdd12");
> + if (IS_ERR(ps_bridge->pwr_1v2_supply)) {
> + ret = PTR_ERR(ps_bridge->pwr_1v2_supply);
> + dev_err(dev, "cannot get vdd12 supply: %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->gpio_mode_sel_n = devm_gpiod_get(&client->dev, "mode-sel",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(ps_bridge->gpio_mode_sel_n)) {
> + ret = PTR_ERR(ps_bridge->gpio_mode_sel_n);
> + dev_err(dev, "cannot get gpio_mode_sel_n %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->gpio_slp_n = devm_gpiod_get(&client->dev, "sleep",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(ps_bridge->gpio_slp_n)) {
> + ret = PTR_ERR(ps_bridge->gpio_slp_n);
> + dev_err(dev, "cannot get gpio_slp_n: %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->gpio_rst_n = devm_gpiod_get(&client->dev, "reset",
> + GPIOD_OUT_HIGH);
> + if (IS_ERR(ps_bridge->gpio_rst_n)) {
> + ret = PTR_ERR(ps_bridge->gpio_rst_n);
> + dev_err(dev, "cannot get gpio_rst_n: %d\n", ret);
> + return ret;
> + }
> +
> + ps_bridge->bridge.funcs = &ps8640_bridge_funcs;
> + ps_bridge->bridge.of_node = dev->of_node;
> + ret = drm_bridge_add(&ps_bridge->bridge);
> + if (ret) {
> + dev_err(dev, "Failed to add bridge: %d\n", ret);
> + return ret;
> + }
> +
> + i2c_set_clientdata(client, ps_bridge);
> +
> + return 0;
> +}
> +
> +static int ps8640_remove(struct i2c_client *client)
> +{
> + struct ps8640 *ps_bridge = i2c_get_clientdata(client);
> +
> + drm_bridge_remove(&ps_bridge->bridge);
> +
> + return 0;
> +}
> +
> +static const struct i2c_device_id ps8640_i2c_table[] = {
> + {"parade,ps8640", 0},
> + {},
> +};
> +MODULE_DEVICE_TABLE(i2c, ps8640_i2c_table);
> +
> +static const struct of_device_id ps8640_match[] = {
> + { .compatible = "parade,ps8640" },
> + {},
> +};
> +MODULE_DEVICE_TABLE(of, ps8640_match);
> +
> +static struct i2c_driver ps8640_driver = {
> + .id_table = ps8640_i2c_table,
> + .probe = ps8640_probe,
> + .remove = ps8640_remove,
> + .driver = {
> + .name = "parade,ps8640",
> + .of_match_table = ps8640_match,
> + },
> +};
> +module_i2c_driver(ps8640_driver);
> +
> +MODULE_AUTHOR("Jitao Shi <jitao.shi@...iatek.com>");
> +MODULE_AUTHOR("CK Hu <ck.hu@...iatek.com>");
> +MODULE_DESCRIPTION("PARADE ps8640 DSI-eDP converter driver");
> +MODULE_LICENSE("GPL v2");
>
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