drm: add Atmel HLCDC Display Controller support (1a396789) · Commits · 戴 / test

drivers/gpu/drm/Kconfig

+2 −0

Original line number	Diff line number	Diff line
		@@ -183,6 +183,8 @@ source "drivers/gpu/drm/cirrus/Kconfig"

		source "drivers/gpu/drm/armada/Kconfig"

		source "drivers/gpu/drm/atmel-hlcdc/Kconfig"

		source "drivers/gpu/drm/rcar-du/Kconfig"

		source "drivers/gpu/drm/shmobile/Kconfig"

drivers/gpu/drm/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -54,6 +54,7 @@ obj-$(CONFIG_DRM_GMA500) += gma500/
		obj-$(CONFIG_DRM_UDL) += udl/
		obj-$(CONFIG_DRM_AST) += ast/
		obj-$(CONFIG_DRM_ARMADA) += armada/
		obj-$(CONFIG_DRM_ATMEL_HLCDC) += atmel-hlcdc/
		obj-$(CONFIG_DRM_RCAR_DU) += rcar-du/
		obj-$(CONFIG_DRM_SHMOBILE) +=shmobile/
		obj-$(CONFIG_DRM_OMAP) += omapdrm/

drivers/gpu/drm/atmel-hlcdc/Kconfig

0 → 100644

+11 −0

Original line number	Diff line number	Diff line
		config DRM_ATMEL_HLCDC
		tristate "DRM Support for ATMEL HLCDC Display Controller"
		depends on DRM && OF && COMMON_CLK && MFD_ATMEL_HLCDC
		select DRM_GEM_CMA_HELPER
		select DRM_KMS_HELPER
		select DRM_KMS_FB_HELPER
		select DRM_KMS_CMA_HELPER
		select DRM_PANEL
		help
		Choose this option if you have an ATMEL SoC with an HLCDC display
		controller (i.e. at91sam9n12, at91sam9x5 family or sama5d3 family).

drivers/gpu/drm/atmel-hlcdc/Makefile

0 → 100644

+7 −0

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		atmel-hlcdc-dc-y := atmel_hlcdc_crtc.o \
		atmel_hlcdc_dc.o \
		atmel_hlcdc_layer.o \
		atmel_hlcdc_output.o \
		atmel_hlcdc_plane.o

		obj-$(CONFIG_DRM_ATMEL_HLCDC) += atmel-hlcdc-dc.o

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c

0 → 100644

+406 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2014 Traphandler
		* Copyright (C) 2014 Free Electrons
		*
		* Author: Jean-Jacques Hiblot <jjhiblot@traphandler.com>
		* Author: Boris BREZILLON <boris.brezillon@free-electrons.com>
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms of the GNU General Public License version 2 as published by
		* the Free Software Foundation.
		*
		* This program is distributed in the hope that it will be useful, but WITHOUT
		* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
		* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
		* more details.
		*
		* You should have received a copy of the GNU General Public License along with
		* this program. If not, see <http://www.gnu.org/licenses/>.
		*/

		#include <linux/clk.h>
		#include <linux/pm.h>
		#include <linux/pm_runtime.h>

		#include <drm/drm_crtc.h>
		#include <drm/drm_crtc_helper.h>
		#include <drm/drmP.h>

		#include <video/videomode.h>

		#include "atmel_hlcdc_dc.h"

		/**
		* Atmel HLCDC CRTC structure
		*
		* @base: base DRM CRTC structure
		* @hlcdc: pointer to the atmel_hlcdc structure provided by the MFD device
		* @event: pointer to the current page flip event
		* @id: CRTC id (returned by drm_crtc_index)
		* @dpms: DPMS mode
		*/
		struct atmel_hlcdc_crtc {
		struct drm_crtc base;
		struct atmel_hlcdc_dc *dc;
		struct drm_pending_vblank_event *event;
		int id;
		int dpms;
		};

		static inline struct atmel_hlcdc_crtc *
		drm_crtc_to_atmel_hlcdc_crtc(struct drm_crtc *crtc)
		{
		return container_of(crtc, struct atmel_hlcdc_crtc, base);
		}

		static void atmel_hlcdc_crtc_dpms(struct drm_crtc *c, int mode)
		{
		struct drm_device *dev = c->dev;
		struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
		struct regmap *regmap = crtc->dc->hlcdc->regmap;
		unsigned int status;

		if (mode != DRM_MODE_DPMS_ON)
		mode = DRM_MODE_DPMS_OFF;

		if (crtc->dpms == mode)
		return;

		pm_runtime_get_sync(dev->dev);

		if (mode != DRM_MODE_DPMS_ON) {
		regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP);
		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
		(status & ATMEL_HLCDC_DISP))
		cpu_relax();

		regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC);
		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
		(status & ATMEL_HLCDC_SYNC))
		cpu_relax();

		regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK);
		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
		(status & ATMEL_HLCDC_PIXEL_CLK))
		cpu_relax();

		clk_disable_unprepare(crtc->dc->hlcdc->sys_clk);

		pm_runtime_allow(dev->dev);
		} else {
		pm_runtime_forbid(dev->dev);

		clk_prepare_enable(crtc->dc->hlcdc->sys_clk);

		regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK);
		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
		!(status & ATMEL_HLCDC_PIXEL_CLK))
		cpu_relax();


		regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC);
		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
		!(status & ATMEL_HLCDC_SYNC))
		cpu_relax();

		regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP);
		while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) &&
		!(status & ATMEL_HLCDC_DISP))
		cpu_relax();
		}

		pm_runtime_put_sync(dev->dev);

		crtc->dpms = mode;
		}

		static int atmel_hlcdc_crtc_mode_set(struct drm_crtc *c,
		struct drm_display_mode *mode,
		struct drm_display_mode *adj,
		int x, int y,
		struct drm_framebuffer *old_fb)
		{
		struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
		struct regmap *regmap = crtc->dc->hlcdc->regmap;
		struct drm_plane *plane = c->primary;
		struct drm_framebuffer *fb;
		unsigned long mode_rate;
		struct videomode vm;
		unsigned long prate;
		unsigned int cfg;
		int div;

		if (atmel_hlcdc_dc_mode_valid(crtc->dc, adj) != MODE_OK)
		return -EINVAL;

		vm.vfront_porch = adj->crtc_vsync_start - adj->crtc_vdisplay;
		vm.vback_porch = adj->crtc_vtotal - adj->crtc_vsync_end;
		vm.vsync_len = adj->crtc_vsync_end - adj->crtc_vsync_start;
		vm.hfront_porch = adj->crtc_hsync_start - adj->crtc_hdisplay;
		vm.hback_porch = adj->crtc_htotal - adj->crtc_hsync_end;
		vm.hsync_len = adj->crtc_hsync_end - adj->crtc_hsync_start;

		regmap_write(regmap, ATMEL_HLCDC_CFG(1),
		(vm.hsync_len - 1) \| ((vm.vsync_len - 1) << 16));

		regmap_write(regmap, ATMEL_HLCDC_CFG(2),
		(vm.vfront_porch - 1) \| (vm.vback_porch << 16));

		regmap_write(regmap, ATMEL_HLCDC_CFG(3),
		(vm.hfront_porch - 1) \| ((vm.hback_porch - 1) << 16));

		regmap_write(regmap, ATMEL_HLCDC_CFG(4),
		(adj->crtc_hdisplay - 1) \|
		((adj->crtc_vdisplay - 1) << 16));

		cfg = ATMEL_HLCDC_CLKPOL;

		prate = clk_get_rate(crtc->dc->hlcdc->sys_clk);
		mode_rate = mode->crtc_clock * 1000;
		if ((prate / 2) < mode_rate) {
		prate *= 2;
		cfg \|= ATMEL_HLCDC_CLKSEL;
		}

		div = DIV_ROUND_UP(prate, mode_rate);
		if (div < 2)
		div = 2;

		cfg \|= ATMEL_HLCDC_CLKDIV(div);

		regmap_update_bits(regmap, ATMEL_HLCDC_CFG(0),
		ATMEL_HLCDC_CLKSEL \| ATMEL_HLCDC_CLKDIV_MASK \|
		ATMEL_HLCDC_CLKPOL, cfg);

		cfg = 0;

		if (mode->flags & DRM_MODE_FLAG_NVSYNC)
		cfg \|= ATMEL_HLCDC_VSPOL;

		if (mode->flags & DRM_MODE_FLAG_NHSYNC)
		cfg \|= ATMEL_HLCDC_HSPOL;

		regmap_update_bits(regmap, ATMEL_HLCDC_CFG(5),
		ATMEL_HLCDC_HSPOL \| ATMEL_HLCDC_VSPOL \|
		ATMEL_HLCDC_VSPDLYS \| ATMEL_HLCDC_VSPDLYE \|
		ATMEL_HLCDC_DISPPOL \| ATMEL_HLCDC_DISPDLY \|
		ATMEL_HLCDC_VSPSU \| ATMEL_HLCDC_VSPHO \|
		ATMEL_HLCDC_GUARDTIME_MASK,
		cfg);

		fb = plane->fb;
		plane->fb = old_fb;

		return atmel_hlcdc_plane_update_with_mode(plane, c, fb, 0, 0,
		adj->hdisplay, adj->vdisplay,
		x << 16, y << 16,
		adj->hdisplay << 16,
		adj->vdisplay << 16,
		adj);
		}

		int atmel_hlcdc_crtc_mode_set_base(struct drm_crtc *c, int x, int y,
		struct drm_framebuffer *old_fb)
		{
		struct drm_plane *plane = c->primary;
		struct drm_framebuffer *fb = plane->fb;
		struct drm_display_mode *mode = &c->hwmode;

		plane->fb = old_fb;

		return plane->funcs->update_plane(plane, c, fb,
		0, 0,
		mode->hdisplay,
		mode->vdisplay,
		x << 16, y << 16,
		mode->hdisplay << 16,
		mode->vdisplay << 16);
		}

		static void atmel_hlcdc_crtc_prepare(struct drm_crtc *crtc)
		{
		atmel_hlcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
		}

		static void atmel_hlcdc_crtc_commit(struct drm_crtc *crtc)
		{
		atmel_hlcdc_crtc_dpms(crtc, DRM_MODE_DPMS_ON);
		}

		static bool atmel_hlcdc_crtc_mode_fixup(struct drm_crtc *crtc,
		const struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
		{
		return true;
		}

		static void atmel_hlcdc_crtc_disable(struct drm_crtc *crtc)
		{
		struct drm_plane *plane;

		atmel_hlcdc_crtc_dpms(crtc, DRM_MODE_DPMS_OFF);
		crtc->primary->funcs->disable_plane(crtc->primary);

		drm_for_each_legacy_plane(plane, &crtc->dev->mode_config.plane_list) {
		if (plane->crtc != crtc)
		continue;

		plane->funcs->disable_plane(crtc->primary);
		plane->crtc = NULL;
		}
		}

		static const struct drm_crtc_helper_funcs lcdc_crtc_helper_funcs = {
		.mode_fixup = atmel_hlcdc_crtc_mode_fixup,
		.dpms = atmel_hlcdc_crtc_dpms,
		.mode_set = atmel_hlcdc_crtc_mode_set,
		.mode_set_base = atmel_hlcdc_crtc_mode_set_base,
		.prepare = atmel_hlcdc_crtc_prepare,
		.commit = atmel_hlcdc_crtc_commit,
		.disable = atmel_hlcdc_crtc_disable,
		};

		static void atmel_hlcdc_crtc_destroy(struct drm_crtc *c)
		{
		struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);

		drm_crtc_cleanup(c);
		kfree(crtc);
		}

		void atmel_hlcdc_crtc_cancel_page_flip(struct drm_crtc *c,
		struct drm_file *file)
		{
		struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
		struct drm_pending_vblank_event *event;
		struct drm_device *dev = c->dev;
		unsigned long flags;

		spin_lock_irqsave(&dev->event_lock, flags);
		event = crtc->event;
		if (event && event->base.file_priv == file) {
		event->base.destroy(&event->base);
		drm_vblank_put(dev, crtc->id);
		crtc->event = NULL;
		}
		spin_unlock_irqrestore(&dev->event_lock, flags);
		}

		static void atmel_hlcdc_crtc_finish_page_flip(struct atmel_hlcdc_crtc *crtc)
		{
		struct drm_device *dev = crtc->base.dev;
		unsigned long flags;

		spin_lock_irqsave(&dev->event_lock, flags);
		if (crtc->event) {
		drm_send_vblank_event(dev, crtc->id, crtc->event);
		drm_vblank_put(dev, crtc->id);
		crtc->event = NULL;
		}
		spin_unlock_irqrestore(&dev->event_lock, flags);
		}

		void atmel_hlcdc_crtc_irq(struct drm_crtc *c)
		{
		drm_handle_vblank(c->dev, 0);
		atmel_hlcdc_crtc_finish_page_flip(drm_crtc_to_atmel_hlcdc_crtc(c));
		}

		static int atmel_hlcdc_crtc_page_flip(struct drm_crtc *c,
		struct drm_framebuffer *fb,
		struct drm_pending_vblank_event *event,
		uint32_t page_flip_flags)
		{
		struct atmel_hlcdc_crtc *crtc = drm_crtc_to_atmel_hlcdc_crtc(c);
		struct atmel_hlcdc_plane_update_req req;
		struct drm_plane *plane = c->primary;
		struct drm_device *dev = c->dev;
		unsigned long flags;
		int ret = 0;

		spin_lock_irqsave(&dev->event_lock, flags);
		if (crtc->event)
		ret = -EBUSY;
		spin_unlock_irqrestore(&dev->event_lock, flags);

		if (ret)
		return ret;

		memset(&req, 0, sizeof(req));
		req.crtc_x = 0;
		req.crtc_y = 0;
		req.crtc_h = c->mode.crtc_vdisplay;
		req.crtc_w = c->mode.crtc_hdisplay;
		req.src_x = c->x << 16;
		req.src_y = c->y << 16;
		req.src_w = req.crtc_w << 16;
		req.src_h = req.crtc_h << 16;
		req.fb = fb;

		ret = atmel_hlcdc_plane_prepare_update_req(plane, &req, &c->hwmode);
		if (ret)
		return ret;

		if (event) {
		drm_vblank_get(c->dev, crtc->id);
		spin_lock_irqsave(&dev->event_lock, flags);
		crtc->event = event;
		spin_unlock_irqrestore(&dev->event_lock, flags);
		}

		ret = atmel_hlcdc_plane_apply_update_req(plane, &req);
		if (ret)
		crtc->event = NULL;
		else
		plane->fb = fb;

		return ret;
		}

		static const struct drm_crtc_funcs atmel_hlcdc_crtc_funcs = {
		.page_flip = atmel_hlcdc_crtc_page_flip,
		.set_config = drm_crtc_helper_set_config,
		.destroy = atmel_hlcdc_crtc_destroy,
		};

		int atmel_hlcdc_crtc_create(struct drm_device *dev)
		{
		struct atmel_hlcdc_dc *dc = dev->dev_private;
		struct atmel_hlcdc_planes *planes = dc->planes;
		struct atmel_hlcdc_crtc *crtc;
		int ret;
		int i;

		crtc = kzalloc(sizeof(*crtc), GFP_KERNEL);
		if (!crtc)
		return -ENOMEM;

		crtc->dpms = DRM_MODE_DPMS_OFF;
		crtc->dc = dc;

		ret = drm_crtc_init_with_planes(dev, &crtc->base,
		&planes->primary->base,
		planes->cursor ? &planes->cursor->base : NULL,
		&atmel_hlcdc_crtc_funcs);
		if (ret < 0)
		goto fail;

		crtc->id = drm_crtc_index(&crtc->base);

		if (planes->cursor)
		planes->cursor->base.possible_crtcs = 1 << crtc->id;

		for (i = 0; i < planes->noverlays; i++)
		planes->overlays[i]->base.possible_crtcs = 1 << crtc->id;

		drm_crtc_helper_add(&crtc->base, &lcdc_crtc_helper_funcs);

		dc->crtc = &crtc->base;

		return 0;

		fail:
		atmel_hlcdc_crtc_destroy(&crtc->base);
		return ret;
		}

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