diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.15/950-0795-drm-tiny-Add-MIPI-DBI-compatible-SPI-driver.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.15/950-0795-drm-tiny-Add-MIPI-DBI-compatible-SPI-driver.patch | 515 |
1 files changed, 515 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.15/950-0795-drm-tiny-Add-MIPI-DBI-compatible-SPI-driver.patch b/target/linux/bcm27xx/patches-5.15/950-0795-drm-tiny-Add-MIPI-DBI-compatible-SPI-driver.patch new file mode 100644 index 0000000000..6133070d1e --- /dev/null +++ b/target/linux/bcm27xx/patches-5.15/950-0795-drm-tiny-Add-MIPI-DBI-compatible-SPI-driver.patch @@ -0,0 +1,515 @@ +From e73c6348ebeeb60bc92b316904c7ae5ca7b68fe1 Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Noralf=20Tr=C3=B8nnes?= <noralf@tronnes.org> +Date: Sun, 27 Feb 2022 13:47:13 +0100 +Subject: [PATCH] drm/tiny: Add MIPI DBI compatible SPI driver +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +commit 0e65e2e upstream. + +Add a driver that will work with most MIPI DBI compatible SPI panels. +This avoids adding a driver for every new MIPI DBI compatible controller +that is to be used by Linux. The 'compatible' Device Tree property with +a '.bin' suffix will be used to load a firmware file that contains the +controller configuration. + +Example (driver will load sainsmart18.bin): + +display@0 { + compatible = "sainsmart18", "panel-mipi-dbi-spi"; +... +}; + +v5: +- kconfig: s/DRM_KMS_CMA_HELPER/DRM_GEM_CMA_HELPER/ (Sam) +- kconfig: Add select VIDEOMODE_HELPERS (Sam) +- kconfig: Add wiki url in the description (Sam) +- Split out and use of_get_drm_panel_display_mode()(Sam) +- Only use the first compatible to look for a firmware file since the + binding mandates 2 compatibles. +- Make having a firmware file mandatory so we can print an error + message if it's missing to improve the user experience. It's very + unlikely that a controller doesn't need to be initialized and if + it doesn't, it's possible to have a firmware file containing only + a DCS NOP. + +v4: +- Move driver to drm/tiny where the other drivers of its kind are located. + The driver module will not be shared with a future DPI driver after all. + +v3: +- Move properties to DT (Maxime) +- The MIPI DPI spec has optional support for DPI where the controller is + configured over DBI. Rework the command functions so they can be moved + to drm_mipi_dbi and shared with a future panel-mipi-dpi-spi driver + +v2: +- Drop model property and use compatible instead (Rob) +- Add wiki entry in MAINTAINERS + +Acked-by: Maxime Ripard <maxime@cerno.tech> +Reviewed-by: Sam Ravnborg <sam@ravnborg.org> +Signed-off-by: Noralf Trønnes <noralf@tronnes.org> +Signed-off-by: Maxime Ripard <maxime@cerno.tech> +Link: https://patchwork.freedesktop.org/patch/msgid/20220227124713.39766-6-noralf@tronnes.org +--- + MAINTAINERS | 8 + + drivers/gpu/drm/tiny/Kconfig | 15 + + drivers/gpu/drm/tiny/Makefile | 1 + + drivers/gpu/drm/tiny/panel-mipi-dbi.c | 398 ++++++++++++++++++++++++++ + 4 files changed, 422 insertions(+) + create mode 100644 drivers/gpu/drm/tiny/panel-mipi-dbi.c + +--- a/MAINTAINERS ++++ b/MAINTAINERS +@@ -5976,6 +5976,14 @@ T: git git://anongit.freedesktop.org/drm + F: Documentation/devicetree/bindings/display/multi-inno,mi0283qt.txt + F: drivers/gpu/drm/tiny/mi0283qt.c + ++DRM DRIVER FOR MIPI DBI compatible panels ++M: Noralf Trønnes <noralf@tronnes.org> ++S: Maintained ++W: https://github.com/notro/panel-mipi-dbi/wiki ++T: git git://anongit.freedesktop.org/drm/drm-misc ++F: Documentation/devicetree/bindings/display/panel/panel-mipi-dbi-spi.yaml ++F: drivers/gpu/drm/tiny/panel-mipi-dbi.c ++ + DRM DRIVER FOR MSM ADRENO GPU + M: Rob Clark <robdclark@gmail.com> + M: Sean Paul <sean@poorly.run> +--- a/drivers/gpu/drm/tiny/Kconfig ++++ b/drivers/gpu/drm/tiny/Kconfig +@@ -51,6 +51,21 @@ config DRM_GM12U320 + This is a KMS driver for projectors which use the GM12U320 chipset + for video transfer over USB2/3, such as the Acer C120 mini projector. + ++config DRM_PANEL_MIPI_DBI ++ tristate "DRM support for MIPI DBI compatible panels" ++ depends on DRM && SPI ++ select DRM_KMS_HELPER ++ select DRM_GEM_CMA_HELPER ++ select DRM_MIPI_DBI ++ select BACKLIGHT_CLASS_DEVICE ++ select VIDEOMODE_HELPERS ++ help ++ Say Y here if you want to enable support for MIPI DBI compatible ++ panels. The controller command setup can be provided using a ++ firmware file. For more information see ++ https://github.com/notro/panel-mipi-dbi/wiki. ++ To compile this driver as a module, choose M here. ++ + config DRM_SIMPLEDRM + tristate "Simple framebuffer driver" + depends on DRM +--- a/drivers/gpu/drm/tiny/Makefile ++++ b/drivers/gpu/drm/tiny/Makefile +@@ -4,6 +4,7 @@ obj-$(CONFIG_DRM_ARCPGU) += arcpgu.o + obj-$(CONFIG_DRM_BOCHS) += bochs.o + obj-$(CONFIG_DRM_CIRRUS_QEMU) += cirrus.o + obj-$(CONFIG_DRM_GM12U320) += gm12u320.o ++obj-$(CONFIG_DRM_PANEL_MIPI_DBI) += panel-mipi-dbi.o + obj-$(CONFIG_DRM_SIMPLEDRM) += simpledrm.o + obj-$(CONFIG_TINYDRM_HX8357D) += hx8357d.o + obj-$(CONFIG_TINYDRM_ILI9225) += ili9225.o +--- /dev/null ++++ b/drivers/gpu/drm/tiny/panel-mipi-dbi.c +@@ -0,0 +1,398 @@ ++// SPDX-License-Identifier: GPL-2.0 ++/* ++ * DRM driver for MIPI DBI compatible display panels ++ * ++ * Copyright 2022 Noralf Trønnes ++ */ ++ ++#include <linux/backlight.h> ++#include <linux/delay.h> ++#include <linux/firmware.h> ++#include <linux/gpio/consumer.h> ++#include <linux/module.h> ++#include <linux/property.h> ++#include <linux/regulator/consumer.h> ++#include <linux/spi/spi.h> ++ ++#include <drm/drm_atomic_helper.h> ++#include <drm/drm_drv.h> ++#include <drm/drm_fb_helper.h> ++#include <drm/drm_gem_atomic_helper.h> ++#include <drm/drm_gem_cma_helper.h> ++#include <drm/drm_managed.h> ++#include <drm/drm_mipi_dbi.h> ++#include <drm/drm_modes.h> ++#include <drm/drm_modeset_helper.h> ++ ++#include <video/mipi_display.h> ++ ++static const u8 panel_mipi_dbi_magic[15] = { 'M', 'I', 'P', 'I', ' ', 'D', 'B', 'I', ++ 0, 0, 0, 0, 0, 0, 0 }; ++ ++/* ++ * The display controller configuration is stored in a firmware file. ++ * The Device Tree 'compatible' property value with a '.bin' suffix is passed ++ * to request_firmware() to fetch this file. ++ */ ++struct panel_mipi_dbi_config { ++ /* Magic string: panel_mipi_dbi_magic */ ++ u8 magic[15]; ++ ++ /* Config file format version */ ++ u8 file_format_version; ++ ++ /* ++ * MIPI commands to execute when the display pipeline is enabled. ++ * This is used to configure the display controller. ++ * ++ * The commands are stored in a byte array with the format: ++ * command, num_parameters, [ parameter, ...], command, ... ++ * ++ * Some commands require a pause before the next command can be received. ++ * Inserting a delay in the command sequence is done by using the NOP command with one ++ * parameter: delay in miliseconds (the No Operation command is part of the MIPI Display ++ * Command Set where it has no parameters). ++ * ++ * Example: ++ * command 0x11 ++ * sleep 120ms ++ * command 0xb1 parameters 0x01, 0x2c, 0x2d ++ * command 0x29 ++ * ++ * Byte sequence: ++ * 0x11 0x00 ++ * 0x00 0x01 0x78 ++ * 0xb1 0x03 0x01 0x2c 0x2d ++ * 0x29 0x00 ++ */ ++ u8 commands[]; ++}; ++ ++struct panel_mipi_dbi_commands { ++ const u8 *buf; ++ size_t len; ++}; ++ ++static struct panel_mipi_dbi_commands * ++panel_mipi_dbi_check_commands(struct device *dev, const struct firmware *fw) ++{ ++ const struct panel_mipi_dbi_config *config = (struct panel_mipi_dbi_config *)fw->data; ++ struct panel_mipi_dbi_commands *commands; ++ size_t size = fw->size, commands_len; ++ unsigned int i = 0; ++ ++ if (size < sizeof(*config) + 2) { /* At least 1 command */ ++ dev_err(dev, "config: file size=%zu is too small\n", size); ++ return ERR_PTR(-EINVAL); ++ } ++ ++ if (memcmp(config->magic, panel_mipi_dbi_magic, sizeof(config->magic))) { ++ dev_err(dev, "config: Bad magic: %15ph\n", config->magic); ++ return ERR_PTR(-EINVAL); ++ } ++ ++ if (config->file_format_version != 1) { ++ dev_err(dev, "config: version=%u is not supported\n", config->file_format_version); ++ return ERR_PTR(-EINVAL); ++ } ++ ++ drm_dev_dbg(dev, DRM_UT_DRIVER, "size=%zu version=%u\n", size, config->file_format_version); ++ ++ commands_len = size - sizeof(*config); ++ ++ while ((i + 1) < commands_len) { ++ u8 command = config->commands[i++]; ++ u8 num_parameters = config->commands[i++]; ++ const u8 *parameters = &config->commands[i]; ++ ++ i += num_parameters; ++ if (i > commands_len) { ++ dev_err(dev, "config: command=0x%02x num_parameters=%u overflows\n", ++ command, num_parameters); ++ return ERR_PTR(-EINVAL); ++ } ++ ++ if (command == 0x00 && num_parameters == 1) ++ drm_dev_dbg(dev, DRM_UT_DRIVER, "sleep %ums\n", parameters[0]); ++ else ++ drm_dev_dbg(dev, DRM_UT_DRIVER, "command %02x %*ph\n", ++ command, num_parameters, parameters); ++ } ++ ++ if (i != commands_len) { ++ dev_err(dev, "config: malformed command array\n"); ++ return ERR_PTR(-EINVAL); ++ } ++ ++ commands = devm_kzalloc(dev, sizeof(*commands), GFP_KERNEL); ++ if (!commands) ++ return ERR_PTR(-ENOMEM); ++ ++ commands->len = commands_len; ++ commands->buf = devm_kmemdup(dev, config->commands, commands->len, GFP_KERNEL); ++ if (!commands->buf) ++ return ERR_PTR(-ENOMEM); ++ ++ return commands; ++} ++ ++static struct panel_mipi_dbi_commands *panel_mipi_dbi_commands_from_fw(struct device *dev) ++{ ++ struct panel_mipi_dbi_commands *commands; ++ const struct firmware *fw; ++ const char *compatible; ++ char fw_name[40]; ++ int ret; ++ ++ ret = of_property_read_string_index(dev->of_node, "compatible", 0, &compatible); ++ if (ret) ++ return ERR_PTR(ret); ++ ++ snprintf(fw_name, sizeof(fw_name), "%s.bin", compatible); ++ ret = request_firmware(&fw, fw_name, dev); ++ if (ret) { ++ dev_err(dev, "No config file found for compatible '%s' (error=%d)\n", ++ compatible, ret); ++ ++ return ERR_PTR(ret); ++ } ++ ++ commands = panel_mipi_dbi_check_commands(dev, fw); ++ release_firmware(fw); ++ ++ return commands; ++} ++ ++static void panel_mipi_dbi_commands_execute(struct mipi_dbi *dbi, ++ struct panel_mipi_dbi_commands *commands) ++{ ++ unsigned int i = 0; ++ ++ if (!commands) ++ return; ++ ++ while (i < commands->len) { ++ u8 command = commands->buf[i++]; ++ u8 num_parameters = commands->buf[i++]; ++ const u8 *parameters = &commands->buf[i]; ++ ++ if (command == 0x00 && num_parameters == 1) ++ msleep(parameters[0]); ++ else if (num_parameters) ++ mipi_dbi_command_stackbuf(dbi, command, parameters, num_parameters); ++ else ++ mipi_dbi_command(dbi, command); ++ ++ i += num_parameters; ++ } ++} ++ ++static void panel_mipi_dbi_enable(struct drm_simple_display_pipe *pipe, ++ struct drm_crtc_state *crtc_state, ++ struct drm_plane_state *plane_state) ++{ ++ struct mipi_dbi_dev *dbidev = drm_to_mipi_dbi_dev(pipe->crtc.dev); ++ struct mipi_dbi *dbi = &dbidev->dbi; ++ int ret, idx; ++ ++ if (!drm_dev_enter(pipe->crtc.dev, &idx)) ++ return; ++ ++ drm_dbg(pipe->crtc.dev, "\n"); ++ ++ ret = mipi_dbi_poweron_conditional_reset(dbidev); ++ if (ret < 0) ++ goto out_exit; ++ if (!ret) ++ panel_mipi_dbi_commands_execute(dbi, dbidev->driver_private); ++ ++ mipi_dbi_enable_flush(dbidev, crtc_state, plane_state); ++out_exit: ++ drm_dev_exit(idx); ++} ++ ++static const struct drm_simple_display_pipe_funcs panel_mipi_dbi_pipe_funcs = { ++ .enable = panel_mipi_dbi_enable, ++ .disable = mipi_dbi_pipe_disable, ++ .update = mipi_dbi_pipe_update, ++}; ++ ++DEFINE_DRM_GEM_CMA_FOPS(panel_mipi_dbi_fops); ++ ++static const struct drm_driver panel_mipi_dbi_driver = { ++ .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC, ++ .fops = &panel_mipi_dbi_fops, ++ DRM_GEM_CMA_DRIVER_OPS_VMAP, ++ .debugfs_init = mipi_dbi_debugfs_init, ++ .name = "panel-mipi-dbi", ++ .desc = "MIPI DBI compatible display panel", ++ .date = "20220103", ++ .major = 1, ++ .minor = 0, ++}; ++ ++static int panel_mipi_dbi_get_mode(struct mipi_dbi_dev *dbidev, struct drm_display_mode *mode) ++{ ++ struct device *dev = dbidev->drm.dev; ++ u16 hback_porch, vback_porch; ++ int ret; ++ ++ ret = of_get_drm_panel_display_mode(dev->of_node, mode, NULL); ++ if (ret) { ++ dev_err(dev, "%pOF: failed to get panel-timing (error=%d)\n", dev->of_node, ret); ++ return ret; ++ } ++ ++ mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED; ++ ++ hback_porch = mode->htotal - mode->hsync_end; ++ vback_porch = mode->vtotal - mode->vsync_end; ++ ++ /* ++ * Make sure width and height are set and that only back porch and ++ * pixelclock are set in the other timing values. Also check that ++ * width and height don't exceed the 16-bit value specified by MIPI DCS. ++ */ ++ if (!mode->hdisplay || !mode->vdisplay || mode->flags || ++ mode->hsync_end > mode->hdisplay || (hback_porch + mode->hdisplay) > 0xffff || ++ mode->vsync_end > mode->vdisplay || (vback_porch + mode->vdisplay) > 0xffff) { ++ dev_err(dev, "%pOF: panel-timing out of bounds\n", dev->of_node); ++ return -EINVAL; ++ } ++ ++ /* The driver doesn't use the pixel clock but it is mandatory so fake one if not set */ ++ if (!mode->clock) ++ mode->clock = mode->htotal * mode->vtotal * 60 / 1000; ++ ++ dbidev->top_offset = vback_porch; ++ dbidev->left_offset = hback_porch; ++ ++ return 0; ++} ++ ++static int panel_mipi_dbi_spi_probe(struct spi_device *spi) ++{ ++ struct device *dev = &spi->dev; ++ struct drm_display_mode mode; ++ struct mipi_dbi_dev *dbidev; ++ struct drm_device *drm; ++ struct mipi_dbi *dbi; ++ struct gpio_desc *dc; ++ int ret; ++ ++ dbidev = devm_drm_dev_alloc(dev, &panel_mipi_dbi_driver, struct mipi_dbi_dev, drm); ++ if (IS_ERR(dbidev)) ++ return PTR_ERR(dbidev); ++ ++ dbi = &dbidev->dbi; ++ drm = &dbidev->drm; ++ ++ ret = panel_mipi_dbi_get_mode(dbidev, &mode); ++ if (ret) ++ return ret; ++ ++ dbidev->regulator = devm_regulator_get(dev, "power"); ++ if (IS_ERR(dbidev->regulator)) ++ return dev_err_probe(dev, PTR_ERR(dbidev->regulator), ++ "Failed to get regulator 'power'\n"); ++ ++ dbidev->backlight = devm_of_find_backlight(dev); ++ if (IS_ERR(dbidev->backlight)) ++ return dev_err_probe(dev, PTR_ERR(dbidev->backlight), "Failed to get backlight\n"); ++ ++ dbi->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH); ++ if (IS_ERR(dbi->reset)) ++ return dev_err_probe(dev, PTR_ERR(dbi->reset), "Failed to get GPIO 'reset'\n"); ++ ++ dc = devm_gpiod_get_optional(dev, "dc", GPIOD_OUT_LOW); ++ if (IS_ERR(dc)) ++ return dev_err_probe(dev, PTR_ERR(dc), "Failed to get GPIO 'dc'\n"); ++ ++ ret = mipi_dbi_spi_init(spi, dbi, dc); ++ if (ret) ++ return ret; ++ ++ if (device_property_present(dev, "write-only")) ++ dbi->read_commands = NULL; ++ ++ dbidev->driver_private = panel_mipi_dbi_commands_from_fw(dev); ++ if (IS_ERR(dbidev->driver_private)) ++ return PTR_ERR(dbidev->driver_private); ++ ++ ret = mipi_dbi_dev_init(dbidev, &panel_mipi_dbi_pipe_funcs, &mode, 0); ++ if (ret) ++ return ret; ++ ++ drm_mode_config_reset(drm); ++ ++ ret = drm_dev_register(drm, 0); ++ if (ret) ++ return ret; ++ ++ spi_set_drvdata(spi, drm); ++ ++ drm_fbdev_generic_setup(drm, 0); ++ ++ return 0; ++} ++ ++static int panel_mipi_dbi_spi_remove(struct spi_device *spi) ++{ ++ struct drm_device *drm = spi_get_drvdata(spi); ++ ++ drm_dev_unplug(drm); ++ drm_atomic_helper_shutdown(drm); ++ ++ return 0; ++} ++ ++static void panel_mipi_dbi_spi_shutdown(struct spi_device *spi) ++{ ++ drm_atomic_helper_shutdown(spi_get_drvdata(spi)); ++} ++ ++static int __maybe_unused panel_mipi_dbi_pm_suspend(struct device *dev) ++{ ++ return drm_mode_config_helper_suspend(dev_get_drvdata(dev)); ++} ++ ++static int __maybe_unused panel_mipi_dbi_pm_resume(struct device *dev) ++{ ++ drm_mode_config_helper_resume(dev_get_drvdata(dev)); ++ ++ return 0; ++} ++ ++static const struct dev_pm_ops panel_mipi_dbi_pm_ops = { ++ SET_SYSTEM_SLEEP_PM_OPS(panel_mipi_dbi_pm_suspend, panel_mipi_dbi_pm_resume) ++}; ++ ++static const struct of_device_id panel_mipi_dbi_spi_of_match[] = { ++ { .compatible = "panel-mipi-dbi-spi" }, ++ {}, ++}; ++MODULE_DEVICE_TABLE(of, panel_mipi_dbi_spi_of_match); ++ ++static const struct spi_device_id panel_mipi_dbi_spi_id[] = { ++ { "panel-mipi-dbi-spi", 0 }, ++ { }, ++}; ++MODULE_DEVICE_TABLE(spi, panel_mipi_dbi_spi_id); ++ ++static struct spi_driver panel_mipi_dbi_spi_driver = { ++ .driver = { ++ .name = "panel-mipi-dbi-spi", ++ .owner = THIS_MODULE, ++ .of_match_table = panel_mipi_dbi_spi_of_match, ++ .pm = &panel_mipi_dbi_pm_ops, ++ }, ++ .id_table = panel_mipi_dbi_spi_id, ++ .probe = panel_mipi_dbi_spi_probe, ++ .remove = panel_mipi_dbi_spi_remove, ++ .shutdown = panel_mipi_dbi_spi_shutdown, ++}; ++module_spi_driver(panel_mipi_dbi_spi_driver); ++ ++MODULE_DESCRIPTION("MIPI DBI compatible display panel driver"); ++MODULE_AUTHOR("Noralf Trønnes"); ++MODULE_LICENSE("GPL"); |