Den 12.08.2018 20.46, skrev Sam Ravnborg:
This is a DRM based driver for the Atmel LCDC IP.
There exist today a framebuffer based driver and
this is a re-implmentation of the same on top of DRM.
The rewrite was based on the original fbdev driver
but the driver has also seen inspiration from
the atmel-hlcdc_dc driver and others.
The driver is not a full replacement:
- STN displays are not supported
Binding support is missing but most of the
STN specific functionality is otherwise ported
from the fbdev driver.
- gamma support is missing
The driver utilises drm_simple_kms_helper and
this helper lacks support for settting up gamma
- modesetting is not checked (see TODO in file)
- support for extra modes as applicable (and lcd-wiring-mode)
- support for AVR32 (is it relevant?)
Signed-off-by: Sam Ravnborg <s...@ravnborg.org>
Cc: Nicolas Ferre <nicolas.fe...@atmel.com>
Cc: Boris Brezillon <boris.brezil...@free-electrons.com>
Cc: Alexandre Belloni <alexandre.bell...@bootlin.com>
---
MAINTAINERS | 7 +
drivers/gpu/drm/atmel/Kconfig | 12 +
drivers/gpu/drm/atmel/Makefile | 2 +
drivers/gpu/drm/atmel/atmel_lcdc-dc.c | 1094 +++++++++++++++++++++++++++++++++
4 files changed, 1115 insertions(+)
create mode 100644 drivers/gpu/drm/atmel/atmel_lcdc-dc.c
<snip>
diff --git a/drivers/gpu/drm/atmel/atmel_lcdc-dc.c
b/drivers/gpu/drm/atmel/atmel_lcdc-dc.c
new file mode 100644
index 000000000000..275a09e2e100
--- /dev/null
+++ b/drivers/gpu/drm/atmel/atmel_lcdc-dc.c
@@ -0,0 +1,1094 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Sam Ravnborg
+ *
+ * The driver is based on atmel_lcdfb which is:
+ * Copyright (C) 2007 Atmel Corporation
+ *
+ * Atmel LCD Controller Display Controller.
+ * A sub-device of the Atmel LCDC IP.
+ *
+ * The Atmel LCD Controller supports in the following configuration:
+ * - TFT only, with BGR565, 8 bits/pixel
+ * - Resolution up to 2048x2048
+ * - Single plane, crtc, one fixed output
+ *
+ * Features not (yet) ported from atmel_lcdfb:
+ * - Support for extra modes (and configurable intensify bit)
+ * - Check modesetting support - lcdc_dc_display_check()
+ * - set color / palette handling
+ * - support for STN displays (partly implemented)
+ * - AVR32 support (relevant?)
+ */
+
+#include <linux/regulator/consumer.h>
+#include <linux/mfd/atmel-lcdc.h>
+#include <linux/of_platform.h>
+#include <linux/pm_runtime.h>
+#include <linux/irqreturn.h>
+#include <linux/device.h>
+#include <linux/regmap.h>
+
+#include <video/videomode.h>
+
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_simple_kms_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_fourcc.h>
+#include <drm/drm_vblank.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_of.h>
+
+/* Parameters */
+#define ATMEL_LCDC_DMA_BURST_LEN 8 /* words */
+
+/**
+ * struct atmel_lcdc_dc_desc - CPU specific configuration properties
+ */
+struct atmel_lcdc_dc_desc {
+ int guard_time;
+ int fifo_size;
+ int min_width;
+ int min_height;
+ int max_width;
+ int max_height;
+ bool have_hozval;
+ bool have_alt_pixclock;
+};
+
+/* private data */
+struct lcdc_dc {
+ const struct atmel_lcdc_dc_desc *desc;
+ struct atmel_mfd_lcdc *mfd_lcdc;
+ struct regulator *lcd_supply;
+ struct drm_fbdev_cma *fbdev;
There's generic fbdev emulaton now, so you can drop this.
More info further down.
+ struct drm_bridge *bridge;
+ struct drm_panel *panel;
+ struct regmap *regmap;
+ struct device *dev;
+
+ struct drm_simple_display_pipe pipe;
+ struct work_struct reset_lcdc_work;
+ struct drm_connector connector;
+};
+
+/* Configuration of individual CPU's */
+static const struct atmel_lcdc_dc_desc atmel_lcdc_dc_at91sam9261 = {
+ .guard_time = 1,
+ .fifo_size = 512,
+ .min_width = 0,
+ .min_height = 0,
Looks like the minimum is always zero, maybe drop it?
+ .max_width = 2048,
+ .max_height = 2048,
+ .have_hozval = true,
+ .have_alt_pixclock = false,
+};
+
+static const struct atmel_lcdc_dc_desc atmel_lcdc_dc_at91sam9263 = {
+ .guard_time = 1,
+ .fifo_size = 2048,
+ .min_width = 0,
+ .min_height = 0,
+ .max_width = 2048,
+ .max_height = 2048,
+ .have_hozval = false,
+ .have_alt_pixclock = false,
+};
+
+static const struct atmel_lcdc_dc_desc atmel_lcdc_dc_at91sam9g10 = {
+ .guard_time = 1,
+ .fifo_size = 512,
+ .min_width = 0,
+ .min_height = 0,
+ .max_width = 2048,
+ .max_height = 2048,
+ .have_hozval = true,
+ .have_alt_pixclock = false,
+};
+
+static const struct atmel_lcdc_dc_desc atmel_lcdc_dc_at91sam9g45 = {
+ .guard_time = 1,
+ .fifo_size = 512,
+ .min_width = 0,
+ .min_height = 0,
+ .max_width = 2048,
+ .max_height = 2048,
+ .have_hozval = false,
+ .have_alt_pixclock = true,
+};
+
+static const struct atmel_lcdc_dc_desc atmel_lcdc_dc_at91sam9g46 = {
+ .guard_time = 1,
+ .fifo_size = 512,
+ .min_width = 0,
+ .min_height = 0,
+ .max_width = 2048,
+ .max_height = 2048,
+ .have_hozval = false,
+ .have_alt_pixclock = false,
+};
+
+static const struct atmel_lcdc_dc_desc atmel_lcdc_dc_at91sam9m10 = {
+ .guard_time = 1,
+ .fifo_size = 512,
+ .min_width = 0,
+ .min_height = 0,
+ .max_width = 2048,
+ .max_height = 2048,
+ .have_hozval = false,
+ .have_alt_pixclock = false,
+};
+
+static const struct atmel_lcdc_dc_desc atmel_lcdc_dc_at91sam9m11 = {
+ .guard_time = 1,
+ .fifo_size = 512,
+ .min_width = 0,
+ .min_height = 0,
+ .max_width = 2048,
+ .max_height = 2048,
+ .have_hozval = false,
+ .have_alt_pixclock = false,
+};
+
+static const struct atmel_lcdc_dc_desc atmel_lcdc_dc_at91sam9rl = {
+ .guard_time = 1,
+ .fifo_size = 512,
+ .min_width = 0,
+ .min_height = 0,
+ .max_width = 2048,
+ .max_height = 2048,
+ .have_hozval = false,
+ .have_alt_pixclock = false,
+};
<snip>
+DEFINE_DRM_GEM_CMA_FOPS(lcdc_dc_drm_fops);
+
+static struct drm_driver lcdc_dc_drm_driver = {
+ .driver_features = DRIVER_HAVE_IRQ |
+ DRIVER_GEM |
+ DRIVER_MODESET |
+ DRIVER_PRIME |
+ DRIVER_ATOMIC,
+ .name = "atmel-lcdc",
+ .desc = "Atmel LCD Display Controller DRM",
+ .date = "20180808",
+ .major = 1,
+ .minor = 0,
+ .patchlevel = 0,
+
+ .lastclose = drm_fb_helper_lastclose,
You can drop this, lastclose is handled by the generic fbdev emulation.
+ .fops = &lcdc_dc_drm_fops,
+
+ .irq_handler = lcdc_dc_irq_handler,
+ .irq_preinstall = lcdc_dc_irq_uninstall,
+ .irq_postinstall = lcdc_dc_irq_postinstall,
+ .irq_uninstall = lcdc_dc_irq_uninstall,
+
+ .dumb_create = drm_gem_cma_dumb_create,
+
+ .gem_print_info = drm_gem_cma_print_info,
+ .gem_vm_ops = &drm_gem_cma_vm_ops,
+
+ .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
+ .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
+
+ .gem_prime_import = drm_gem_prime_import,
+ .gem_prime_export = drm_gem_prime_export,
+
+ .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
+ .gem_free_object_unlocked = drm_gem_cma_free_object,
+
+ .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+ .gem_prime_vmap = drm_gem_cma_prime_vmap,
+ .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
+ .gem_prime_mmap = drm_gem_cma_prime_mmap,
+};
+
+static int lcdc_dc_modeset_init(struct lcdc_dc *lcdc_dc, struct drm_device
*drm)
+{
+ struct drm_bridge *bridge;
+ struct drm_panel *panel;
+ struct device_node *np;
+ struct device *dev;
+ int ret;
+
+ dev = drm->dev;
+
+ drm_mode_config_init(drm);
+ drm->mode_config.min_width = lcdc_dc->desc->min_width;
+ drm->mode_config.min_height = lcdc_dc->desc->min_height;
+ drm->mode_config.max_width = lcdc_dc->desc->max_width;
+ drm->mode_config.max_height = lcdc_dc->desc->max_height;
+ drm->mode_config.funcs = &mode_config_funcs;
+
+ np = dev->of_node;
+ /* port@0 is the output port */
+ ret = drm_of_find_panel_or_bridge(np, 0, 0, &panel, &bridge);
+ if (ret && ret != -ENODEV) {
+ DRM_DEV_ERROR(dev, "Failed to find panel (%d)\n", ret);
+ goto err_out;
+ }
+
+ bridge = drm_panel_bridge_add(panel, DRM_MODE_CONNECTOR_Unknown);
+ if (IS_ERR(bridge)) {
+ ret = PTR_ERR(bridge);
+ DRM_DEV_ERROR(dev, "Failed to add bridge (%d)", ret);
+ goto err_panel_remove;
+ }
+
+ lcdc_dc->panel = panel;
+ lcdc_dc->bridge = bridge;
+
+ ret = drm_simple_display_pipe_init(drm,
+ &lcdc_dc->pipe,
+ &lcdc_dc_display_funcs,
+ lcdc_dc_formats,
+ ARRAY_SIZE(lcdc_dc_formats),
+ NULL,
+ &lcdc_dc->connector);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "Failed to init display pipe (%d)\n", ret);
+ goto err_panel_remove;
+ }
+
+ ret = drm_simple_display_pipe_attach_bridge(&lcdc_dc->pipe, bridge);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to attach bridge (%d)", ret);
+ goto err_panel_remove;
+ }
+
+ drm_mode_config_reset(drm);
+
+ return 0;
+
+err_panel_remove:
+ if (panel)
+ drm_panel_bridge_remove(bridge);
+
+err_out:
+ return ret;
+}
+
+static int lcdc_dc_load(struct drm_device *drm)
+{
+ const struct of_device_id *match;
+ struct platform_device *pdev;
+ struct lcdc_dc *lcdc_dc;
+ struct device *dev;
+ int ret;
+
+ dev = drm->dev;
+ pdev = to_platform_device(dev);
+
+ match = of_match_node(atmel_lcdc_of_match, dev->parent->of_node);
+ if (!match) {
+ DRM_DEV_ERROR(dev, "invalid compatible string (node=%s)",
+ dev->parent->of_node->name);
+ return -ENODEV;
+ }
+
+ if (!match->data) {
+ DRM_DEV_ERROR(dev, "invalid lcdc_dc description\n");
+ return -EINVAL;
+ }
+
+ lcdc_dc = devm_kzalloc(dev, sizeof(*lcdc_dc), GFP_KERNEL);
+ if (!lcdc_dc) {
+ DRM_DEV_ERROR(dev, "Failed to allocate lcdc_dc\n");
+ return -ENOMEM;
+ }
+
+ /* reset of lcdc might sleep and require a preemptible task context */
+ INIT_WORK(&lcdc_dc->reset_lcdc_work, reset_lcdc_work);
+
+ platform_set_drvdata(pdev, drm);
+ dev_set_drvdata(dev, lcdc_dc);
+
+ lcdc_dc->mfd_lcdc = dev_get_drvdata(dev->parent);
+ drm->dev_private = lcdc_dc;
+
+ lcdc_dc->regmap = lcdc_dc->mfd_lcdc->regmap;
+ lcdc_dc->desc = match->data;
+ lcdc_dc->dev = dev;
+
+ lcdc_dc->lcd_supply = devm_regulator_get(dev, "lcd");
+ if (IS_ERR(lcdc_dc->lcd_supply)) {
+ DRM_DEV_ERROR(dev, "Failed to get lcd-supply (%ld)\n",
+ PTR_ERR(lcdc_dc->lcd_supply));
+ lcdc_dc->lcd_supply = NULL;
+ }
+
+ lcdc_dc_start_clock(lcdc_dc);
+
+ pm_runtime_enable(dev);
+
+ ret = drm_vblank_init(drm, 1);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "failed to initialize vblank (%d)\n",
+ ret);
+ goto err_pm_runtime_disable;
+ }
+
+ ret = lcdc_dc_modeset_init(lcdc_dc, drm);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "modeset_init failed (%d)", ret);
+ goto err_pm_runtime_disable;
+ }
+
+ pm_runtime_get_sync(dev);
+ ret = drm_irq_install(drm, lcdc_dc->mfd_lcdc->irq);
+ pm_runtime_put_sync(dev);
+ if (ret < 0) {
+ DRM_DEV_ERROR(dev, "Failed to install IRQ (%d)\n", ret);
+
+ goto err_pm_runtime_disable;
+ }
+
+ /*
+ * Passing in 16 here will make the RGB656 mode the default
+ * Passing in 32 will use XRGB8888 mode
+ */
+ drm_fb_cma_fbdev_init(drm, 16, 0);
You are using both drm_fb_cma_fbdev_init() and drm_fbdev_cma_init() which
does the same. I'm to blame for the confusion, the generic fbdev emulation
idea came up during refactoring, so there's an old way and a new way, which
is now obsolete (both will be removed when drivers have been converted to
drm_fbdev_generic_setup()).
You can use drm_fbdev_generic_setup(drm, 16) instead, and that's all you
need to get fbdev emulation.
I see that many drivers register fbdev before they register the DRM device.
Personally I find this strange to make the emulated device available
before the real one. I suggest you call drm_fbdev_generic_setup() after
drm_dev_register() and if it fails, just put a note in the log and let the
driver succeed in probing.
+
+ drm_kms_helper_poll_init(drm);
+
+ lcdc_dc->fbdev = drm_fbdev_cma_init(drm, 8, 1);
+ if (IS_ERR(lcdc_dc->fbdev)) {
+ ret = PTR_ERR(lcdc_dc->fbdev);
+ DRM_DEV_ERROR(dev, "Failed to init FB CMA area (%d)", ret);
+ goto err_irq_uninstall;
+ }
+
+ drm_helper_hpd_irq_event(drm);
+
+ return 0;
+
+err_irq_uninstall:
+ pm_runtime_get_sync(dev);
+ drm_irq_uninstall(drm);
+ pm_runtime_put_sync(dev);
+
+err_pm_runtime_disable:
+ pm_runtime_disable(dev);
+ lcdc_dc_stop_clock(lcdc_dc);
+
+ cancel_work_sync(&lcdc_dc->reset_lcdc_work);
+
+ return ret;
+}
+
+static void lcdc_dc_unload(struct drm_device *dev)
+{
+ struct lcdc_dc *lcdc_dc = dev->dev_private;
+
+ drm_fb_cma_fbdev_fini(dev);
You can remove this. fbdev is automatically unregistered by
drm_dev_unregister().
Noralf.
+ flush_work(&lcdc_dc->reset_lcdc_work);
+ drm_kms_helper_poll_fini(dev);
+ if (lcdc_dc->panel)
+ drm_panel_bridge_remove(lcdc_dc->bridge);
+ drm_mode_config_cleanup(dev);
+
+ pm_runtime_get_sync(dev->dev);
+ drm_irq_uninstall(dev);
+ pm_runtime_put_sync(dev->dev);
+
+ dev->dev_private = NULL;
+
+ pm_runtime_disable(dev->dev);
+ lcdc_dc_stop_clock(lcdc_dc);
+ cancel_work_sync(&lcdc_dc->reset_lcdc_work);
+}
+
+
+static int lcdc_dc_probe(struct platform_device *pdev)
+{
+ struct drm_device *drm;
+ struct device *dev;
+ int ret;
+
+ dev = &pdev->dev;
+
+ drm = drm_dev_alloc(&lcdc_dc_drm_driver, dev);
+ if (IS_ERR(drm)) {
+ DRM_DEV_ERROR(dev, "Failed to allocate drm device\n");
+ return PTR_ERR(drm);
+ }
+
+ ret = lcdc_dc_load(drm);
+ if (ret)
+ goto err_put_ref;
+
+ ret = drm_dev_register(drm, 0);
+ if (ret) {
+ DRM_DEV_ERROR(dev, "Failed to register drm (%d)\n", ret);
+ goto err_unload;
+ }
+
+ return 0;
+
+err_unload:
+ lcdc_dc_unload(drm);
+
+err_put_ref:
+ drm_dev_put(drm);
+ return ret;
+}
+
+static int lcdc_dc_remove(struct platform_device *pdev)
+{
+ struct drm_device *drm;
+
+ drm = platform_get_drvdata(pdev);
+
+ drm_dev_unregister(drm);
+ lcdc_dc_unload(drm);
+ drm_dev_unref(drm);
+
+ return 0;
+}
+
+static const struct of_device_id lcdc_dc_dt_ids[] = {
+ { .compatible = "atmel,lcdc-display-controller", },
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, lcdc_dc_dt_ids);
+
+static struct platform_driver lcdc_dc_driver = {
+ .probe = lcdc_dc_probe,
+ .remove = lcdc_dc_remove,
+ .driver = {
+ .of_match_table = lcdc_dc_dt_ids,
+ .name = "atmel-lcdc-dc",
+ },
+};
+
+module_platform_driver(lcdc_dc_driver);
+
+MODULE_AUTHOR("Sam Ravnborg <s...@ravnborg.org>");
+MODULE_DESCRIPTION("Atmel LCDC Display Controller DRM Driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:atmel-lcdc-dc");
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