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Message-ID: <CAG40kxGkXw7fsb47NZmNJ-dqF003Gf6qSfSSGO_ea0yKi5ymOQ@mail.gmail.com>
Date: Sat, 22 Jun 2024 16:36:49 +0900
From: Hironori KIKUCHI <kikuchan98@...il.com>
To: Jessica Zhang <quic_jesszhan@...cinc.com>
Cc: linux-kernel@...r.kernel.org, Jagan Teki <jagan@...rulasolutions.com>,
Neil Armstrong <neil.armstrong@...aro.org>, Sam Ravnborg <sam@...nborg.org>,
David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v1 2/3] drm/panel: st7701: Add support for SPI for configuration
Hello Jessica,
Thank you for your review and reply!
On Sat, Jun 22, 2024 at 5:31 AM Jessica Zhang <quic_jesszhan@...cinc.com> wrote:
>
>
>
> 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 <kikuchan98@...il.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 <jagan@...rulasolutions.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.
>
Right...
I'll change them to ST7701_WIRTE() and ST7701_CMD* respectively.
Thanks.
> > + 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?
Uh, maybe no?
Actually not intended, but I just want to avoid the need to call
drm_panel_remove() manually and carefully in both st7701_dsi_probe()
and st7701_spi_probe() after calling st7701_probe().
Oh, in this way, I've just noticed that drm_panel_remove() might no
longer need to be explicitly called in st7701_remove(), perhaps?
>
> > 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.
Right, thanks.
>
> >
> > 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()?
To avoid a cast, because I'm unsure which is preferred in kernel...
Would it be better like this?
return devm_add_action_or_reset(dev, (void (*)(void *))st7701_remove, st7701);
or, more directly
return devm_add_action_or_reset(dev, (void (*)(void
*))drm_panel_remove, &st7701->panel);
This emphasizes a relation to the preceding drm_panel_add().
>
> 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 <jagan@...rulasolutions.com>");
> > +MODULE_AUTHOR("Hironori KIKUCHI <kikuchan98@...il.com>");
> > MODULE_DESCRIPTION("Sitronix ST7701 LCD Panel Driver");
> > MODULE_LICENSE("GPL");
> > --
> > 2.45.2
> >
Best regards,
kikuchan.
On Sat, Jun 22, 2024 at 5:31 AM Jessica Zhang <quic_jesszhan@...cinc.com> wrote:
>
>
>
> 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 <kikuchan98@...il.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 <jagan@...rulasolutions.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 <jagan@...rulasolutions.com>");
> > +MODULE_AUTHOR("Hironori KIKUCHI <kikuchan98@...il.com>");
> > MODULE_DESCRIPTION("Sitronix ST7701 LCD Panel Driver");
> > MODULE_LICENSE("GPL");
> > --
> > 2.45.2
> >
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