On 6/18/2024 1:15 AM, Hironori KIKUCHI wrote:
The ST7701 supports not only MIPI DSI, but also SPI as an interface
for configuration. To support a panel connected via RGB parallel
interface, add support for SPI using MIPI DBI helpers.
Signed-off-by: Hironori KIKUCHI <kikucha...@gmail.com>
---
drivers/gpu/drm/panel/Kconfig | 2 +
drivers/gpu/drm/panel/panel-sitronix-st7701.c | 211 ++++++++++++++----
2 files changed, 172 insertions(+), 41 deletions(-)
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 2ae0eb0638f..1831544400d 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -755,7 +755,9 @@ config DRM_PANEL_SHARP_LS060T1SX01
config DRM_PANEL_SITRONIX_ST7701
tristate "Sitronix ST7701 panel driver"
depends on OF
+ depends on SPI
depends on DRM_MIPI_DSI
+ select DRM_MIPI_DBI
depends on BACKLIGHT_CLASS_DEVICE
help
Say Y here if you want to enable support for the Sitronix
diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7701.c
b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
index 421eb4592b6..3c4a66f2fc7 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7701.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7701.c
@@ -4,6 +4,7 @@
* Author: Jagan Teki <ja...@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_DSI(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_DSI(st7701, cmd, seq...)
Hi Hironori,
Is it really correct to keep this as *_DSI? Since the macro can
theoretically support either DBI or DSI write commands, maybe this
should be renamed to something more generic.
\
+ { \
+ 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, DSI_CMD2_BK0_PVGAMCTRL,
- desc->pv_gamma, ARRAY_SIZE(desc->pv_gamma));
- mipi_dsi_dcs_write(st7701->dsi, DSI_CMD2_BK0_NVGAMCTRL,
- desc->nv_gamma, ARRAY_SIZE(desc->nv_gamma));
+ st7701->write_command(st7701, DSI_CMD2_BK0_PVGAMCTRL, desc->pv_gamma,
Same here for the DSI_CMD2_* macros.
+ ARRAY_SIZE(desc->pv_gamma));
+ st7701->write_command(st7701, DSI_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
@@ -974,42 +986,47 @@ static const struct st7701_panel_desc rg_arc_desc = {
.gip_sequence = rg_arc_gip_sequence,
};
-static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
+static void st7701_cleanup(void *data)
+{
+ struct st7701 *st7701 = (struct st7701 *)data;
+
+ drm_panel_remove(&st7701->panel);
+}
+
+static int st7701_probe(struct device *dev, int connector_type)
{
const struct st7701_panel_desc *desc;
struct st7701 *st7701;
int ret;
- st7701 = devm_kzalloc(&dsi->dev, sizeof(*st7701), GFP_KERNEL);
+ desc = of_device_get_match_data(dev);
+ if (!desc)
+ return -ENODEV;
+
+ st7701 = devm_kzalloc(dev, sizeof(*st7701), GFP_KERNEL);
if (!st7701)
return -ENOMEM;
- desc = of_device_get_match_data(&dsi->dev);
- dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
- MIPI_DSI_MODE_LPM | MIPI_DSI_CLOCK_NON_CONTINUOUS;
- dsi->format = desc->format;
- dsi->lanes = desc->lanes;
-
+ st7701->desc = desc;
st7701->supplies[0].supply = "VCC";
st7701->supplies[1].supply = "IOVCC";
- ret = devm_regulator_bulk_get(&dsi->dev, ARRAY_SIZE(st7701->supplies),
+ ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(st7701->supplies),
st7701->supplies);
if (ret < 0)
return ret;
- st7701->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
+ st7701->reset = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
if (IS_ERR(st7701->reset)) {
- dev_err(&dsi->dev, "Couldn't get our reset GPIO\n");
+ dev_err(dev, "Couldn't get our reset GPIO\n");
return PTR_ERR(st7701->reset);
}
- ret = of_drm_get_panel_orientation(dsi->dev.of_node, &st7701->orientation);
+ ret = of_drm_get_panel_orientation(dev->of_node, &st7701->orientation);
if (ret < 0)
- return dev_err_probe(&dsi->dev, ret, "Failed to get
orientation\n");
+ return dev_err_probe(dev, ret, "Failed to get orientation\n");
- drm_panel_init(&st7701->panel, &dsi->dev, &st7701_funcs,
- DRM_MODE_CONNECTOR_DSI);
+ drm_panel_init(&st7701->panel, dev, &st7701_funcs, connector_type);
/**
* Once sleep out has been issued, ST7701 IC required to wait 120ms
@@ -1026,21 +1043,77 @@ static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
if (ret)
return ret;
+ dev_set_drvdata(dev, st7701);
+
drm_panel_add(&st7701->panel);
- mipi_dsi_set_drvdata(dsi, st7701);
- st7701->dsi = dsi;
- st7701->desc = desc;
-
- ret = mipi_dsi_attach(dsi);
+ ret = devm_add_action_or_reset(dev, st7701_cleanup, st7701);
Is the intention here to move to using the devm framework? Also, just
wondering, what advantages does this implementation have over the
original implementation?
if (ret)
- goto err_attach;
+ return ret;
If you're removing the `goto` here, you could probably drop this entire
check and just `return ret` at the end of the function.
return 0;
+}
-err_attach:
- drm_panel_remove(&st7701->panel);
- return ret;
+static void st7701_remove(struct st7701 *st7701)
+{
+ st7701_cleanup(st7701);
Why add an extra helper that's essentially just a wrapper for another
helper? Why can't we directly call st7701_cleanup()?
Thanks,
Jessica Zhang
+}
+
+static int st7701_dsi_probe(struct mipi_dsi_device *dsi)
+{
+ struct st7701 *st7701;
+ int err;
+
+ err = st7701_probe(&dsi->dev, DRM_MODE_CONNECTOR_DSI);
+ if (err)
+ return err;
+
+ 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, err, "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;
+ dsi->format = st7701->desc->format;
+ dsi->lanes = st7701->desc->lanes;
+
+ mipi_dsi_set_drvdata(dsi, st7701);
+
+ err = mipi_dsi_attach(dsi);
+ if (err)
+ return dev_err_probe(&dsi->dev, err, "Failed to init MIPI
DSI\n");
+
+ 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 |
GPIOD_FLAGS_BIT_NONEXCLUSIVE);
+ if (IS_ERR(dc))
+ return dev_err_probe(&spi->dev, PTR_ERR(dc), "Failed to get GPIO for
D/CX\n");
+
+ spi_set_drvdata(spi, st7701);
+
+ 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)
@@ -1048,28 +1121,84 @@ static void st7701_dsi_remove(struct mipi_dsi_device
*dsi)
struct st7701 *st7701 = mipi_dsi_get_drvdata(dsi);
mipi_dsi_detach(dsi);
- drm_panel_remove(&st7701->panel);
+ st7701_remove(st7701);
}
-static const struct of_device_id st7701_of_match[] = {
+static void st7701_spi_remove(struct spi_device *spi)
+{
+ struct st7701 *st7701 = spi_get_drvdata(spi);
+
+ st7701_remove(st7701);
+}
+
+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 },
- { }
+ { /* sentinel */ }
};
-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,
+ .remove = st7701_spi_remove,
+ .id_table = st7701_spi_ids,
+ .driver = {
+ .name = "st7701",
+ .of_match_table = st7701_spi_of_match,
+ },
+};
+
+static int __init st7701_driver_init(void)
+{
+ int err;
+
+ 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) {
+ 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);
+
+ spi_unregister_driver(&st7701_spi_driver);
+}
+module_exit(st7701_driver_exit);
MODULE_AUTHOR("Jagan Teki <ja...@amarulasolutions.com>");
+MODULE_AUTHOR("Hironori KIKUCHI <kikucha...@gmail.com>");
MODULE_DESCRIPTION("Sitronix ST7701 LCD Panel Driver");
MODULE_LICENSE("GPL");
--
2.45.2
