drm/panel: Add Sharp LQ101R1SX01 support

This panel requires dual-channel mode. The device accepts command-mode
data on 8 lanes and will therefore need a dual-channel DSI controller.
The two interfaces that make up this device need to be instantiated in
the controllers that gang up to provide the dual-channel DSI host.

Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-08-01 14:26:35 +02:00
parent 99035e9931
commit 1976dbca04
4 changed files with 527 additions and 0 deletions

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@ -0,0 +1,49 @@
Sharp Microelectronics 10.1" WQXGA TFT LCD panel
This panel requires a dual-channel DSI host to operate. It supports two modes:
- left-right: each channel drives the left or right half of the screen
- even-odd: each channel drives the even or odd lines of the screen
Each of the DSI channels controls a separate DSI peripheral. The peripheral
driven by the first link (DSI-LINK1), left or even, is considered the primary
peripheral and controls the device. The 'link2' property contains a phandle
to the peripheral driven by the second link (DSI-LINK2, right or odd).
Note that in video mode the DSI-LINK1 interface always provides the left/even
pixels and DSI-LINK2 always provides the right/odd pixels. In command mode it
is possible to program either link to drive the left/even or right/odd pixels
but for the sake of consistency this binding assumes that the same assignment
is chosen as for video mode.
Required properties:
- compatible: should be "sharp,lq101r1sx01"
- reg: DSI virtual channel of the peripheral
Required properties (for DSI-LINK1 only):
- link2: phandle to the DSI peripheral on the secondary link. Note that the
presence of this property marks the containing node as DSI-LINK1.
- power-supply: phandle of the regulator that provides the supply voltage
Optional properties (for DSI-LINK1 only):
- backlight: phandle of the backlight device attached to the panel
Example:
dsi@54300000 {
panel: panel@0 {
compatible = "sharp,lq101r1sx01";
reg = <0>;
link2 = <&secondary>;
power-supply = <...>;
backlight = <...>;
};
};
dsi@54400000 {
secondary: panel@0 {
compatible = "sharp,lq101r1sx01";
reg = <0>;
};
};

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@ -27,4 +27,17 @@ config DRM_PANEL_S6E8AA0
select DRM_MIPI_DSI
select VIDEOMODE_HELPERS
config DRM_PANEL_SHARP_LQ101R1SX01
tristate "Sharp LQ101R1SX01 panel"
depends on OF
depends on DRM_MIPI_DSI
help
Say Y here if you want to enable support for Sharp LQ101R1SX01
TFT-LCD modules. The panel has a 2560x1600 resolution and uses
24 bit RGB per pixel. It provides a dual MIPI DSI interface to
the host and has a built-in LED backlight.
To compile this driver as a module, choose M here: the module
will be called panel-sharp-lq101r1sx01.
endmenu

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@ -1,3 +1,4 @@
obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
obj-$(CONFIG_DRM_PANEL_LD9040) += panel-ld9040.o
obj-$(CONFIG_DRM_PANEL_S6E8AA0) += panel-s6e8aa0.o
obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o

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@ -0,0 +1,464 @@
/*
* Copyright (C) 2014 NVIDIA Corporation
*
* 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.
*/
#include <linux/backlight.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>
#include <video/mipi_display.h>
#include <linux/host1x.h>
struct sharp_panel {
struct drm_panel base;
/* the datasheet refers to them as DSI-LINK1 and DSI-LINK2 */
struct mipi_dsi_device *link1;
struct mipi_dsi_device *link2;
struct backlight_device *backlight;
struct regulator *supply;
bool prepared;
bool enabled;
const struct drm_display_mode *mode;
};
static inline struct sharp_panel *to_sharp_panel(struct drm_panel *panel)
{
return container_of(panel, struct sharp_panel, base);
}
static int sharp_panel_write(struct sharp_panel *sharp, u16 offset, u8 value)
{
u8 payload[3] = { offset >> 8, offset & 0xff, value };
struct mipi_dsi_device *dsi = sharp->link1;
ssize_t err;
err = mipi_dsi_generic_write(dsi, payload, sizeof(payload));
if (err < 0) {
dev_err(&dsi->dev, "failed to write %02x to %04x: %zd\n",
value, offset, err);
return err;
}
err = mipi_dsi_dcs_nop(dsi);
if (err < 0) {
dev_err(&dsi->dev, "failed to send DCS nop: %zd\n", err);
return err;
}
usleep_range(10, 20);
return 0;
}
static __maybe_unused int sharp_panel_read(struct sharp_panel *sharp,
u16 offset, u8 *value)
{
ssize_t err;
cpu_to_be16s(&offset);
err = mipi_dsi_generic_read(sharp->link1, &offset, sizeof(offset),
value, sizeof(*value));
if (err < 0)
dev_err(&sharp->link1->dev, "failed to read from %04x: %zd\n",
offset, err);
return err;
}
static int sharp_panel_disable(struct drm_panel *panel)
{
struct sharp_panel *sharp = to_sharp_panel(panel);
if (!sharp->enabled)
return 0;
if (sharp->backlight) {
sharp->backlight->props.power = FB_BLANK_POWERDOWN;
backlight_update_status(sharp->backlight);
}
sharp->enabled = false;
return 0;
}
static int sharp_panel_unprepare(struct drm_panel *panel)
{
struct sharp_panel *sharp = to_sharp_panel(panel);
int err;
if (!sharp->prepared)
return 0;
err = mipi_dsi_dcs_set_display_off(sharp->link1);
if (err < 0)
dev_err(panel->dev, "failed to set display off: %d\n", err);
err = mipi_dsi_dcs_enter_sleep_mode(sharp->link1);
if (err < 0)
dev_err(panel->dev, "failed to enter sleep mode: %d\n", err);
msleep(120);
regulator_disable(sharp->supply);
sharp->prepared = false;
return 0;
}
static int sharp_setup_symmetrical_split(struct mipi_dsi_device *left,
struct mipi_dsi_device *right,
const struct drm_display_mode *mode)
{
int err;
err = mipi_dsi_dcs_set_column_address(left, 0, mode->hdisplay / 2 - 1);
if (err < 0) {
dev_err(&left->dev, "failed to set column address: %d\n", err);
return err;
}
err = mipi_dsi_dcs_set_page_address(left, 0, mode->vdisplay - 1);
if (err < 0) {
dev_err(&left->dev, "failed to set page address: %d\n", err);
return err;
}
err = mipi_dsi_dcs_set_column_address(right, mode->hdisplay / 2,
mode->hdisplay - 1);
if (err < 0) {
dev_err(&right->dev, "failed to set column address: %d\n", err);
return err;
}
err = mipi_dsi_dcs_set_page_address(right, 0, mode->vdisplay - 1);
if (err < 0) {
dev_err(&right->dev, "failed to set page address: %d\n", err);
return err;
}
return 0;
}
static int sharp_panel_prepare(struct drm_panel *panel)
{
struct sharp_panel *sharp = to_sharp_panel(panel);
u8 format = MIPI_DCS_PIXEL_FMT_24BIT;
int err;
if (sharp->prepared)
return 0;
err = regulator_enable(sharp->supply);
if (err < 0)
return err;
usleep_range(10000, 20000);
err = mipi_dsi_dcs_soft_reset(sharp->link1);
if (err < 0) {
dev_err(panel->dev, "soft reset failed: %d\n", err);
goto poweroff;
}
msleep(120);
err = mipi_dsi_dcs_exit_sleep_mode(sharp->link1);
if (err < 0) {
dev_err(panel->dev, "failed to exit sleep mode: %d\n", err);
goto poweroff;
}
/*
* The MIPI DCS specification mandates this delay only between the
* exit_sleep_mode and enter_sleep_mode commands, so it isn't strictly
* necessary here.
*/
/*
msleep(120);
*/
/* set left-right mode */
err = sharp_panel_write(sharp, 0x1000, 0x2a);
if (err < 0) {
dev_err(panel->dev, "failed to set left-right mode: %d\n", err);
goto poweroff;
}
/* enable command mode */
err = sharp_panel_write(sharp, 0x1001, 0x01);
if (err < 0) {
dev_err(panel->dev, "failed to enable command mode: %d\n", err);
goto poweroff;
}
err = mipi_dsi_dcs_set_pixel_format(sharp->link1, format);
if (err < 0) {
dev_err(panel->dev, "failed to set pixel format: %d\n", err);
goto poweroff;
}
/*
* TODO: The device supports both left-right and even-odd split
* configurations, but this driver currently supports only the left-
* right split. To support a different mode a mechanism needs to be
* put in place to communicate the configuration back to the DSI host
* controller.
*/
err = sharp_setup_symmetrical_split(sharp->link1, sharp->link2,
sharp->mode);
if (err < 0) {
dev_err(panel->dev, "failed to set up symmetrical split: %d\n",
err);
goto poweroff;
}
err = mipi_dsi_dcs_set_display_on(sharp->link1);
if (err < 0) {
dev_err(panel->dev, "failed to set display on: %d\n", err);
goto poweroff;
}
sharp->prepared = true;
return 0;
poweroff:
regulator_disable(sharp->supply);
return err;
}
static int sharp_panel_enable(struct drm_panel *panel)
{
struct sharp_panel *sharp = to_sharp_panel(panel);
if (sharp->enabled)
return 0;
if (sharp->backlight) {
sharp->backlight->props.power = FB_BLANK_UNBLANK;
backlight_update_status(sharp->backlight);
}
sharp->enabled = true;
return 0;
}
static const struct drm_display_mode default_mode = {
.clock = 278000,
.hdisplay = 2560,
.hsync_start = 2560 + 128,
.hsync_end = 2560 + 128 + 64,
.htotal = 2560 + 128 + 64 + 64,
.vdisplay = 1600,
.vsync_start = 1600 + 4,
.vsync_end = 1600 + 4 + 8,
.vtotal = 1600 + 4 + 8 + 32,
.vrefresh = 60,
};
static int sharp_panel_get_modes(struct drm_panel *panel)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(panel->drm, &default_mode);
if (!mode) {
dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
default_mode.hdisplay, default_mode.vdisplay,
default_mode.vrefresh);
return -ENOMEM;
}
drm_mode_set_name(mode);
drm_mode_probed_add(panel->connector, mode);
panel->connector->display_info.width_mm = 217;
panel->connector->display_info.height_mm = 136;
return 1;
}
static const struct drm_panel_funcs sharp_panel_funcs = {
.disable = sharp_panel_disable,
.unprepare = sharp_panel_unprepare,
.prepare = sharp_panel_prepare,
.enable = sharp_panel_enable,
.get_modes = sharp_panel_get_modes,
};
static const struct of_device_id sharp_of_match[] = {
{ .compatible = "sharp,lq101r1sx01", },
{ }
};
MODULE_DEVICE_TABLE(of, sharp_of_match);
static int sharp_panel_add(struct sharp_panel *sharp)
{
struct device_node *np;
int err;
sharp->mode = &default_mode;
sharp->supply = devm_regulator_get(&sharp->link1->dev, "power");
if (IS_ERR(sharp->supply))
return PTR_ERR(sharp->supply);
np = of_parse_phandle(sharp->link1->dev.of_node, "backlight", 0);
if (np) {
sharp->backlight = of_find_backlight_by_node(np);
of_node_put(np);
if (!sharp->backlight)
return -EPROBE_DEFER;
}
drm_panel_init(&sharp->base);
sharp->base.funcs = &sharp_panel_funcs;
sharp->base.dev = &sharp->link1->dev;
err = drm_panel_add(&sharp->base);
if (err < 0)
goto put_backlight;
return 0;
put_backlight:
if (sharp->backlight)
put_device(&sharp->backlight->dev);
return err;
}
static void sharp_panel_del(struct sharp_panel *sharp)
{
if (sharp->base.dev)
drm_panel_remove(&sharp->base);
if (sharp->backlight)
put_device(&sharp->backlight->dev);
if (sharp->link2)
put_device(&sharp->link2->dev);
}
static int sharp_panel_probe(struct mipi_dsi_device *dsi)
{
struct mipi_dsi_device *secondary = NULL;
struct sharp_panel *sharp;
struct device_node *np;
int err;
dsi->lanes = 4;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->mode_flags = MIPI_DSI_MODE_LPM;
/* Find DSI-LINK1 */
np = of_parse_phandle(dsi->dev.of_node, "link2", 0);
if (np) {
secondary = of_find_mipi_dsi_device_by_node(np);
of_node_put(np);
if (!secondary)
return -EPROBE_DEFER;
}
/* register a panel for only the DSI-LINK1 interface */
if (secondary) {
sharp = devm_kzalloc(&dsi->dev, sizeof(*sharp), GFP_KERNEL);
if (!sharp) {
put_device(&secondary->dev);
return -ENOMEM;
}
mipi_dsi_set_drvdata(dsi, sharp);
sharp->link2 = secondary;
sharp->link1 = dsi;
err = sharp_panel_add(sharp);
if (err < 0) {
put_device(&secondary->dev);
return err;
}
}
err = mipi_dsi_attach(dsi);
if (err < 0) {
if (secondary)
sharp_panel_del(sharp);
return err;
}
return 0;
}
static int sharp_panel_remove(struct mipi_dsi_device *dsi)
{
struct sharp_panel *sharp = mipi_dsi_get_drvdata(dsi);
int err;
/* only detach from host for the DSI-LINK2 interface */
if (!sharp) {
mipi_dsi_detach(dsi);
return 0;
}
err = sharp_panel_disable(&sharp->base);
if (err < 0)
dev_err(&dsi->dev, "failed to disable panel: %d\n", err);
err = mipi_dsi_detach(dsi);
if (err < 0)
dev_err(&dsi->dev, "failed to detach from DSI host: %d\n", err);
drm_panel_detach(&sharp->base);
sharp_panel_del(sharp);
return 0;
}
static void sharp_panel_shutdown(struct mipi_dsi_device *dsi)
{
struct sharp_panel *sharp = mipi_dsi_get_drvdata(dsi);
/* nothing to do for DSI-LINK2 */
if (!sharp)
return;
sharp_panel_disable(&sharp->base);
}
static struct mipi_dsi_driver sharp_panel_driver = {
.driver = {
.name = "panel-sharp-lq101r1sx01",
.of_match_table = sharp_of_match,
},
.probe = sharp_panel_probe,
.remove = sharp_panel_remove,
.shutdown = sharp_panel_shutdown,
};
module_mipi_dsi_driver(sharp_panel_driver);
MODULE_AUTHOR("Thierry Reding <treding@nvidia.com>");
MODULE_DESCRIPTION("Sharp LQ101R1SX01 panel driver");
MODULE_LICENSE("GPL v2");