linux/drivers/gpu/drm/panel/panel-samsung-s6d16d0.c
Sam Ravnborg aa6c43644b drm/panel: drop drm_device from drm_panel
The panel drivers used drm_panel.drm for two purposes:
1) Argument to drm_mode_duplicate()
2) drm->dev was used in error messages

The first usage is replaced with drm_connector.dev
- drm_connector is already connected to a drm_device
  and we have a valid connector

The second usage is replaced with drm_panel.dev
- this makes drivers more consistent in their dev argument
  used for dev_err() and friends

With these replacements there are no more uses of drm_panel.drm,
so it is removed from struct drm_panel.
With this change drm_panel_attach() and drm_panel_detach()
no longer have any use as they are empty functions.

v2:
  - editorial correction in changelog (Laurent)

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Thierry Reding <thierry.reding@gmail.com>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Maxime Ripard <mripard@kernel.org>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Stefan Mavrodiev <stefan@olimex.com>
Cc: Robert Chiras <robert.chiras@nxp.com>
Cc: "Guido Günther" <agx@sigxcpu.org>
Cc: Purism Kernel Team <kernel@puri.sm>
Link: https://patchwork.freedesktop.org/patch/msgid/20191207140353.23967-8-sam@ravnborg.org
2019-12-09 22:57:26 +01:00

261 lines
5.9 KiB
C

// SPDX-License-Identifier: GPL-2.0+
/*
* MIPI-DSI Samsung s6d16d0 panel driver. This is a 864x480
* AMOLED panel with a command-only DSI interface.
*/
#include <drm/drm_modes.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>
#include <drm/drm_print.h>
#include <linux/gpio/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/delay.h>
#include <linux/of_device.h>
#include <linux/module.h>
struct s6d16d0 {
struct device *dev;
struct drm_panel panel;
struct regulator *supply;
struct gpio_desc *reset_gpio;
};
/*
* The timings are not very helpful as the display is used in
* command mode.
*/
static const struct drm_display_mode samsung_s6d16d0_mode = {
/* HS clock, (htotal*vtotal*vrefresh)/1000 */
.clock = 420160,
.hdisplay = 864,
.hsync_start = 864 + 154,
.hsync_end = 864 + 154 + 16,
.htotal = 864 + 154 + 16 + 32,
.vdisplay = 480,
.vsync_start = 480 + 1,
.vsync_end = 480 + 1 + 1,
.vtotal = 480 + 1 + 1 + 1,
/*
* This depends on the clocking HS vs LP rate, this value
* is calculated as:
* vrefresh = (clock * 1000) / (htotal*vtotal)
*/
.vrefresh = 816,
.width_mm = 84,
.height_mm = 48,
};
static inline struct s6d16d0 *panel_to_s6d16d0(struct drm_panel *panel)
{
return container_of(panel, struct s6d16d0, panel);
}
static int s6d16d0_unprepare(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
/* Enter sleep mode */
ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to enter sleep mode (%d)\n",
ret);
return ret;
}
/* Assert RESET */
gpiod_set_value_cansleep(s6->reset_gpio, 1);
regulator_disable(s6->supply);
return 0;
}
static int s6d16d0_prepare(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
ret = regulator_enable(s6->supply);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to enable supply (%d)\n", ret);
return ret;
}
/* Assert RESET */
gpiod_set_value_cansleep(s6->reset_gpio, 1);
udelay(10);
/* De-assert RESET */
gpiod_set_value_cansleep(s6->reset_gpio, 0);
msleep(120);
/* Enabe tearing mode: send TE (tearing effect) at VBLANK */
ret = mipi_dsi_dcs_set_tear_on(dsi,
MIPI_DSI_DCS_TEAR_MODE_VBLANK);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to enable vblank TE (%d)\n",
ret);
return ret;
}
/* Exit sleep mode and power on */
ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to exit sleep mode (%d)\n",
ret);
return ret;
}
return 0;
}
static int s6d16d0_enable(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
ret = mipi_dsi_dcs_set_display_on(dsi);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to turn display on (%d)\n",
ret);
return ret;
}
return 0;
}
static int s6d16d0_disable(struct drm_panel *panel)
{
struct s6d16d0 *s6 = panel_to_s6d16d0(panel);
struct mipi_dsi_device *dsi = to_mipi_dsi_device(s6->dev);
int ret;
ret = mipi_dsi_dcs_set_display_off(dsi);
if (ret) {
DRM_DEV_ERROR(s6->dev, "failed to turn display off (%d)\n",
ret);
return ret;
}
return 0;
}
static int s6d16d0_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
mode = drm_mode_duplicate(connector->dev, &samsung_s6d16d0_mode);
if (!mode) {
DRM_ERROR("bad mode or failed to add mode\n");
return -EINVAL;
}
drm_mode_set_name(mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
connector->display_info.width_mm = mode->width_mm;
connector->display_info.height_mm = mode->height_mm;
drm_mode_probed_add(connector, mode);
return 1; /* Number of modes */
}
static const struct drm_panel_funcs s6d16d0_drm_funcs = {
.disable = s6d16d0_disable,
.unprepare = s6d16d0_unprepare,
.prepare = s6d16d0_prepare,
.enable = s6d16d0_enable,
.get_modes = s6d16d0_get_modes,
};
static int s6d16d0_probe(struct mipi_dsi_device *dsi)
{
struct device *dev = &dsi->dev;
struct s6d16d0 *s6;
int ret;
s6 = devm_kzalloc(dev, sizeof(struct s6d16d0), GFP_KERNEL);
if (!s6)
return -ENOMEM;
mipi_dsi_set_drvdata(dsi, s6);
s6->dev = dev;
dsi->lanes = 2;
dsi->format = MIPI_DSI_FMT_RGB888;
dsi->hs_rate = 420160000;
dsi->lp_rate = 19200000;
/*
* This display uses command mode so no MIPI_DSI_MODE_VIDEO
* or MIPI_DSI_MODE_VIDEO_SYNC_PULSE
*
* As we only send commands we do not need to be continuously
* clocked.
*/
dsi->mode_flags =
MIPI_DSI_CLOCK_NON_CONTINUOUS |
MIPI_DSI_MODE_EOT_PACKET;
s6->supply = devm_regulator_get(dev, "vdd1");
if (IS_ERR(s6->supply))
return PTR_ERR(s6->supply);
/* This asserts RESET by default */
s6->reset_gpio = devm_gpiod_get_optional(dev, "reset",
GPIOD_OUT_HIGH);
if (IS_ERR(s6->reset_gpio)) {
ret = PTR_ERR(s6->reset_gpio);
if (ret != -EPROBE_DEFER)
DRM_DEV_ERROR(dev, "failed to request GPIO (%d)\n",
ret);
return ret;
}
drm_panel_init(&s6->panel, dev, &s6d16d0_drm_funcs,
DRM_MODE_CONNECTOR_DSI);
ret = drm_panel_add(&s6->panel);
if (ret < 0)
return ret;
ret = mipi_dsi_attach(dsi);
if (ret < 0)
drm_panel_remove(&s6->panel);
return ret;
}
static int s6d16d0_remove(struct mipi_dsi_device *dsi)
{
struct s6d16d0 *s6 = mipi_dsi_get_drvdata(dsi);
mipi_dsi_detach(dsi);
drm_panel_remove(&s6->panel);
return 0;
}
static const struct of_device_id s6d16d0_of_match[] = {
{ .compatible = "samsung,s6d16d0" },
{ }
};
MODULE_DEVICE_TABLE(of, s6d16d0_of_match);
static struct mipi_dsi_driver s6d16d0_driver = {
.probe = s6d16d0_probe,
.remove = s6d16d0_remove,
.driver = {
.name = "panel-samsung-s6d16d0",
.of_match_table = s6d16d0_of_match,
},
};
module_mipi_dsi_driver(s6d16d0_driver);
MODULE_AUTHOR("Linus Wallei <linus.walleij@linaro.org>");
MODULE_DESCRIPTION("MIPI-DSI s6d16d0 Panel Driver");
MODULE_LICENSE("GPL v2");