Hi Laurent.
Third panel driver in line for review.
Review comments that are duplicates from the first two will have only a
brief remark - if any.
On Sun, Jul 07, 2019 at 09:18:58PM +0300, Laurent Pinchart wrote:
> This panel is used on the SDP3430.
Add a little more context and put it in Kconfig help.
Maybe this is the TI board, and maybe it is something else.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/panel/Kconfig | 7 +
> drivers/gpu/drm/panel/Makefile | 1 +
> .../gpu/drm/panel/panel-sharp-ls037v7dw01.c | 231 ++++++++++++++++++
> 3 files changed, 239 insertions(+)
> create mode 100644 drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index da613c04b835..04fd152efe4c 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -271,6 +271,13 @@ config DRM_PANEL_SHARP_LS043T1LE01
> Say Y here if you want to enable support for Sharp LS043T1LE01 qHD
> (540x960) DSI panel as found on the Qualcomm APQ8074 Dragonboard
>
> +config DRM_PANEL_SHARP_LS037V7DW01
> + tristate "Sharp LS037V7DW01 VGA LCD panel"
> + depends on GPIOLIB && OF && REGULATOR
> + help
> + Say Y here if you want to enable support for Sharp LS037V7DW01 VGA
> + (480x640) LCD panel.
> +
Alphabetical order, so it comes before DRM_PANEL_SHARP_LS043T1LE01
> config DRM_PANEL_SITRONIX_ST7701
> tristate "Sitronix ST7701 panel driver"
> depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index e81ed1535024..12dcd76eb87c 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -27,6 +27,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
> obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
> obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
> obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
> +obj-$(CONFIG_DRM_PANEL_SHARP_LS037V7DW01) += panel-sharp-ls037v7dw01.o
> obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
And here it is right.
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-sharp-ls037v7dw01.c
> @@ -0,0 +1,231 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Sharp LS037V7DW01 LCD Panel Driver
> + *
> + * Copyright (C) 2019 Texas Instruments Incorporated
> + *
> + * Based on the omapdrm-specific panel-sharp-ls037v7dw01 driver
> + *
> + * Copyright (C) 2013 Texas Instruments Incorporated
> + * Author: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Add your copyright?
> +struct ls037v7dw01_device {
> + struct drm_panel panel;
> + struct platform_device *pdev;
> +
> + struct regulator *vcc;
The property is named envdd - should they use the same name?
> + struct gpio_desc *resb_gpio; /* low = reset active min 20 us */
> + struct gpio_desc *ini_gpio; /* high = power on */
> + struct gpio_desc *mo_gpio; /* low = 480x640, high = 240x320 */
> + struct gpio_desc *lr_gpio; /* high = conventional horizontal scanning */
> + struct gpio_desc *ud_gpio; /* high = conventional vertical scanning */
> +};
device versus panel, but bikeshedding, so feel free to ignore.
> +
> +static int ls037v7dw01_disable(struct drm_panel *panel)
> +{
> + struct ls037v7dw01_device *lcd = to_ls037v7dw01_device(panel);
> +
> + gpiod_set_value_cansleep(lcd->ini_gpio, 0);
> + gpiod_set_value_cansleep(lcd->resb_gpio, 0);
> +
> + /* Wait at least 5 vsyncs after disabling the LCD. */
> + msleep(100);
> +
> + return 0;
> +}
> +
> +static int ls037v7dw01_unprepare(struct drm_panel *panel)
> +{
> + struct ls037v7dw01_device *lcd = to_ls037v7dw01_device(panel);
> +
> + if (lcd->vcc)
> + regulator_disable(lcd->vcc);
Why is the if (lcd-vcc) needed?
If I read the probe code correct then we either get a regulator or we
error out.
Same goes for all other checks of lcd->vcc
> +static const struct drm_display_mode ls037v7dw01_mode = {
> + .clock = 19200,
> + .hdisplay = 480,
> + .hsync_start = 480 + 1,
> + .hsync_end = 480 + 1 + 2,
> + .htotal = 480 + 1 + 2 + 28,
> + .vdisplay = 640,
> + .vsync_start = 640 + 1,
> + .vsync_end = 640 + 1 + 1,
> + .vtotal = 640 + 1 + 1 + 1,
> + .vrefresh = 58,
> + .type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
> + .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
> +};
> +
> +static int ls037v7dw01_get_modes(struct drm_panel *panel)
> +{
> + struct drm_connector *connector = panel->connector;
> + struct drm_display_mode *mode;
> +
> + mode = drm_mode_duplicate(panel->drm, &ls037v7dw01_mode);
> + if (!mode)
> + return -ENOMEM;
> +
> + drm_mode_set_name(mode);
> + drm_mode_probed_add(connector, mode);
> +
> + connector->display_info.width_mm = 56;
> + connector->display_info.height_mm = 75;
> + /*
> + * FIXME: According to the datasheet pixel data is sampled on the
> + * rising edge of the clock, but the code running on the SDP3430
> + * indicates sampling on the negative edge. This should be tested on a
> + * real device.
> + */
> + connector->display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH
> + | DRM_BUS_FLAG_SYNC_SAMPLE_POSEDGE
> + | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE;
> +
> + return 1;
> +}
> +
> +static const struct drm_panel_funcs ls037v7dw01_funcs = {
> + .disable = ls037v7dw01_disable,
> + .unprepare = ls037v7dw01_unprepare,
> + .prepare = ls037v7dw01_prepare,
> + .enable = ls037v7dw01_enable,
> + .get_modes = ls037v7dw01_get_modes,
> +};
> +
> +static int ls037v7dw01_probe(struct platform_device *pdev)
> +{
> + struct ls037v7dw01_device *lcd;
> +
> + lcd = devm_kzalloc(&pdev->dev, sizeof(*lcd), GFP_KERNEL);
> + if (lcd == NULL)
> + return -ENOMEM;
> +
> + platform_set_drvdata(pdev, lcd);
> + lcd->pdev = pdev;
> +
> + lcd->vcc = devm_regulator_get(&pdev->dev, "envdd");
> + if (IS_ERR(lcd->vcc)) {
> + dev_err(&pdev->dev, "failed to get regulator\n");
> + return PTR_ERR(lcd->vcc);
> + }
> +
> + lcd->ini_gpio = devm_gpiod_get_index(&pdev->dev, "enable", 0,
> + GPIOD_OUT_LOW);
> + if (IS_ERR(lcd->ini_gpio)) {
> + dev_err(&pdev->dev, "failed to get enable gpio\n");
> + return PTR_ERR(lcd->ini_gpio);
> + }
I fail to see why the _index() variant is used here.
But then I did not check the binding, so it may originate from that.
Same goes for ireset gpio
> +
> + lcd->resb_gpio = devm_gpiod_get_index(&pdev->dev, "reset", 0,
> + GPIOD_OUT_LOW);
> + if (IS_ERR(lcd->resb_gpio)) {
> + dev_err(&pdev->dev, "failed to get reset gpio\n");
> + return PTR_ERR(lcd->resb_gpio);
> + }
> +
> + lcd->mo_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 0,
> + GPIOD_OUT_LOW);
> + if (IS_ERR(lcd->mo_gpio)) {
> + dev_err(&pdev->dev, "failed to get mode[0] gpio\n");
> + return PTR_ERR(lcd->mo_gpio);
> + }
> +
> + lcd->lr_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 1,
> + GPIOD_OUT_LOW);
> + if (IS_ERR(lcd->lr_gpio)) {
> + dev_err(&pdev->dev, "failed to get mode[1] gpio\n");
> + return PTR_ERR(lcd->lr_gpio);
> + }
> +
> + lcd->ud_gpio = devm_gpiod_get_index(&pdev->dev, "mode", 2,
> + GPIOD_OUT_LOW);
> + if (IS_ERR(lcd->ud_gpio)) {
> + dev_err(&pdev->dev, "failed to get mode[2] gpio\n");
> + return PTR_ERR(lcd->ud_gpio);
> + }
Do we set mo, lr ,ud gpio when we call devm_gpiod_get, or are they
unused?
> +
> + drm_panel_init(&lcd->panel);
> + lcd->panel.dev = &pdev->dev;
> + lcd->panel.funcs = &ls037v7dw01_funcs;
> +
> + return drm_panel_add(&lcd->panel);
> +}
> +
> +static int ls037v7dw01_remove(struct platform_device *pdev)
> +{
> + struct ls037v7dw01_device *lcd = platform_get_drvdata(pdev);
> +
> + drm_panel_remove(&lcd->panel);
> + ls037v7dw01_disable(&lcd->panel);
> + ls037v7dw01_unprepare(&lcd->panel);
Use drm_panel_disable(), drm_panel_unprepare()
> +
> + return 0;
> +}
> +
> +static const struct of_device_id ls037v7dw01_of_match[] = {
> + { .compatible = "sharp,ls037v7dw01", },
> + {},
{ /* sentinel */ },
> +};
> +
> +MODULE_DEVICE_TABLE(of, ls037v7dw01_of_match);
> +
> +static struct platform_driver ls037v7dw01_driver = {
> + .probe = ls037v7dw01_probe,
> + .remove = __exit_p(ls037v7dw01_remove),
> + .driver = {
> + .name = "panel-sharp-ls037v7dw01",
> + .of_match_table = ls037v7dw01_of_match,
> + },
> +};
> +
> +module_platform_driver(ls037v7dw01_driver);
> +
> +MODULE_AUTHOR("Tomi Valkeinen <tomi.valkeinen@xxxxxx>");
> +MODULE_DESCRIPTION("Sharp LS037V7DW01 Panel Driver");
> +MODULE_LICENSE("GPL");
"GPL v2"?
Sam
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