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drm/panel: st7701: Add support for SPI for configuration

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The ST7701 supports not only MIPI DSI, but also SPI as an interface
for configuration. To support a panel connected via SPI with an RGB
parallel interface, add support for SPI using MIPI DBI helpers.

Signed-off-by: Hironori KIKUCHI <kikuchan98@gmail.com>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20240804061503.881283-5-kikuchan98@gmail.com
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240804061503.881283-5-kikuchan98@gmail.com
This commit is contained in:
Hironori KIKUCHI 2024-08-04 15:14:48 +09:00 committed by Neil Armstrong
parent 9a01fb40fd
commit 6a60273a0e
2 changed files with 110 additions and 16 deletions
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3
drivers/gpu/drm/panel/Kconfig
View File

@ -784,7 +784,8 @@ config DRM_PANEL_SHARP_LS060T1SX01
config DRM_PANEL_SITRONIX_ST7701
tristate "Sitronix ST7701 panel driver"
depends on OF
depends on DRM_MIPI_DSI
depends on SPI || DRM_MIPI_DSI
select DRM_MIPI_DBI if SPI
depends on BACKLIGHT_CLASS_DEVICE
help
Say Y here if you want to enable support for the Sitronix

123
drivers/gpu/drm/panel/panel-sitronix-st7701.c
View File

@ -4,6 +4,7 @@
* Author: Jagan Teki <jagan@amarulasolutions.com>
*/
#include <drm/drm_mipi_dbi.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
@ -14,6 +15,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/regulator/consumer.h>
#include <linux/spi/spi.h>
#include <video/mipi_display.h>
@ -130,12 +132,16 @@ struct st7701_panel_desc {
struct st7701 {
struct drm_panel panel;
struct mipi_dsi_device *dsi;
struct mipi_dbi dbi;
const struct st7701_panel_desc *desc;
struct regulator_bulk_data supplies[2];
struct gpio_desc *reset;
unsigned int sleep_delay;
enum drm_panel_orientation orientation;
int (*write_command)(struct st7701 *st7701, u8 cmd, const u8 *seq,
size_t len);
};
static inline struct st7701 *panel_to_st7701(struct drm_panel *panel)
@ -143,16 +149,22 @@ static inline struct st7701 *panel_to_st7701(struct drm_panel *panel)
return container_of(panel, struct st7701, panel);
}
static inline int st7701_dsi_write(struct st7701 *st7701, const void *seq,
size_t len)
static int st7701_dsi_write(struct st7701 *st7701, u8 cmd, const u8 *seq,
size_t len)
{
return mipi_dsi_dcs_write_buffer(st7701->dsi, seq, len);
return mipi_dsi_dcs_write(st7701->dsi, cmd, seq, len);
}
#define ST7701_WRITE(st7701, seq...) \
{ \
const u8 d[] = { seq }; \
st7701_dsi_write(st7701, d, ARRAY_SIZE(d)); \
static int st7701_dbi_write(struct st7701 *st7701, u8 cmd, const u8 *seq,
size_t len)
{
return mipi_dbi_command_stackbuf(&st7701->dbi, cmd, seq, len);
}
#define ST7701_WRITE(st7701, cmd, seq...) \
{ \
const u8 d[] = { seq }; \
st7701->write_command(st7701, cmd, d, ARRAY_SIZE(d)); \
}
static u8 st7701_vgls_map(struct st7701 *st7701)
@ -211,10 +223,10 @@ static void st7701_init_sequence(struct st7701 *st7701)
/* Command2, BK0 */
st7701_switch_cmd_bkx(st7701, true, 0);
mipi_dsi_dcs_write(st7701->dsi, ST7701_CMD2_BK0_PVGAMCTRL,
desc->pv_gamma, ARRAY_SIZE(desc->pv_gamma));
mipi_dsi_dcs_write(st7701->dsi, ST7701_CMD2_BK0_NVGAMCTRL,
desc->nv_gamma, ARRAY_SIZE(desc->nv_gamma));
st7701->write_command(st7701, ST7701_CMD2_BK0_PVGAMCTRL, desc->pv_gamma,
ARRAY_SIZE(desc->pv_gamma));
st7701->write_command(st7701, ST7701_CMD2_BK0_NVGAMCTRL, desc->nv_gamma,
ARRAY_SIZE(desc->nv_gamma));
/*
* Vertical line count configuration:
* Line[6:0]: select number of vertical lines of the TFT matrix in
@ -1051,6 +1063,10 @@ static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
st7701 = dev_get_drvdata(&dsi->dev);
st7701->dsi = dsi;
st7701->write_command = st7701_dsi_write;
if (!st7701->desc->lanes)
return dev_err_probe(&dsi->dev, -EINVAL, "This panel is not for MIPI DSI\n");
dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS;
@ -1064,30 +1080,107 @@ static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
return 0;
}
static int st7701_spi_probe(struct spi_device *spi)
{
struct st7701 *st7701;
struct gpio_desc *dc;
int err;
err = st7701_probe(&spi->dev, DRM_MODE_CONNECTOR_DPI);
if (err)
return err;
st7701 = dev_get_drvdata(&spi->dev);
st7701->write_command = st7701_dbi_write;
dc = devm_gpiod_get_optional(&spi->dev, "dc", GPIOD_OUT_LOW);
if (IS_ERR(dc))
return dev_err_probe(&spi->dev, PTR_ERR(dc), "Failed to get GPIO for D/CX\n");
err = mipi_dbi_spi_init(spi, &st7701->dbi, dc);
if (err)
return dev_err_probe(&spi->dev, err, "Failed to init MIPI DBI\n");
st7701->dbi.read_commands = NULL;
return 0;
}
static void st7701_dsi_remove(struct mipi_dsi_device *dsi)
{
mipi_dsi_detach(dsi);
}
static const struct of_device_id st7701_of_match[] = {
static const struct of_device_id st7701_dsi_of_match[] = {
{ .compatible = "anbernic,rg-arc-panel", .data = &rg_arc_desc },
{ .compatible = "densitron,dmt028vghmcmi-1a", .data = &dmt028vghmcmi_1a_desc },
{ .compatible = "elida,kd50t048a", .data = &kd50t048a_desc },
{ .compatible = "techstar,ts8550b", .data = &ts8550b_desc },
{ }
};
MODULE_DEVICE_TABLE(of, st7701_of_match);
MODULE_DEVICE_TABLE(of, st7701_dsi_of_match);
static const struct of_device_id st7701_spi_of_match[] = {
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, st7701_spi_of_match);
static const struct spi_device_id st7701_spi_ids[] = {
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(spi, st7701_spi_ids);
static struct mipi_dsi_driver st7701_dsi_driver = {
.probe = st7701_dsi_probe,
.remove = st7701_dsi_remove,
.driver = {
.name = "st7701",
.of_match_table = st7701_of_match,
.of_match_table = st7701_dsi_of_match,
},
};
module_mipi_dsi_driver(st7701_dsi_driver);
static struct spi_driver st7701_spi_driver = {
.probe = st7701_spi_probe,
.id_table = st7701_spi_ids,
.driver = {
.name = "st7701",
.of_match_table = st7701_spi_of_match,
},
};
static int __init st7701_driver_init(void)
{
int err;
if (IS_ENABLED(CONFIG_SPI)) {
err = spi_register_driver(&st7701_spi_driver);
if (err)
return err;
}
if (IS_ENABLED(CONFIG_DRM_MIPI_DSI)) {
err = mipi_dsi_driver_register(&st7701_dsi_driver);
if (err) {
if (IS_ENABLED(CONFIG_SPI))
spi_unregister_driver(&st7701_spi_driver);
return err;
}
}
return 0;
}
module_init(st7701_driver_init);
static void __exit st7701_driver_exit(void)
{
if (IS_ENABLED(CONFIG_DRM_MIPI_DSI))
mipi_dsi_driver_unregister(&st7701_dsi_driver);
if (IS_ENABLED(CONFIG_SPI))
spi_unregister_driver(&st7701_spi_driver);
}
module_exit(st7701_driver_exit);
MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
MODULE_AUTHOR("Hironori KIKUCHI <kikuchan98@gmail.com>");
MODULE_DESCRIPTION("Sitronix ST7701 LCD Panel Driver");
MODULE_LICENSE("GPL");