<commit_before>/*
 * drivers/gpu/drm/omapdrm/omap_crtc.c
 *
 * Copyright (C) 2011 Texas Instruments
 * Author: <NAME> <<EMAIL>>
 *
 * 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 "omap_drv.h"

#include <drm/drm_mode.h>
#include <drm/drm_plane_helper.h>
#include "drm_crtc.h"
#include "drm_crtc_helper.h"

#define to_omap_crtc(x) container_of(x, struct omap_crtc, base)

struct omap_crtc {
	struct drm_crtc base;

	const char *name;
	int pipe;
	enum omap_channel channel;
	struct omap_overlay_manager_info info;
	struct drm_encoder *current_encoder;

	/*
	 * Temporary: eventually this will go away, but it is needed
	 * for now to keep the output's happy.  (They only need
	 * mgr->id.)  Eventually this will be replaced w/ something
	 * more common-panel-framework-y
	 */
	struct omap_overlay_manager *mgr;

	struct omap_video_timings timings;
	bool enabled;

	struct omap_drm_apply apply;

	struct omap_drm_irq apply_irq;
	struct omap_drm_irq error_irq;

	/* list of in-progress apply's: */
	struct list_head pending_applies;

	/* list of queued apply's: */
	struct list_head queued_applies;

	/* for handling queued and in-progress applies: */
	struct work_struct apply_work;

	/* if there is a pending flip, these will be non-null: */
	struct drm_pending_vblank_event *event;
	struct drm_framebuffer *old_fb;

	/* for handling page flips without caring about what
	 * the callback is called from.  Possibly we should just
	 * make omap_gem always call the cb from the worker so
	 * we don't have to care about this..
	 *
	 * XXX maybe fold into apply_work??
	 */
	struct work_struct page_flip_work;

	bool ignore_digit_sync_lost;
};

/* -----------------------------------------------------------------------------
 * Helper Functions
 */

uint32_t pipe2vbl(struct drm_crtc *crtc)
{
	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);

	return dispc_mgr_get_vsync_irq(omap_crtc->channel);
}

const struct omap_video_timings *omap_crtc_timings(struct drm_crtc *crtc)
{
	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
	return &omap_crtc->timings;
}

enum omap_channel omap_crtc_channel(struct drm_crtc *crtc)
{
	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
	return omap_crtc->channel;
}

/* -----------------------------------------------------------------------------
 * DSS Manager Functions
 */

/*
 * Manager-ops, callbacks from output when they need to configure
 * the upstream part of the video pipe.
 *
 * Most of these we can ignore until we add support for command-mode
 * panels.. for video-mode the crtc-helpers already do an adequate
 * job of sequencing the setup of the video pipe in the proper order
 */

/* ovl-mgr-id -> crtc */
static struct omap_crtc *omap_crtcs[8];

/* we can probably ignore these until we support command-mode panels: */
static int omap_crtc_connect(struct omap_overlay_manager *mgr,
		struct omap_dss_device *dst)
{
	if (mgr->output)
		return -EINVAL;

	if ((mgr->supported_outputs & dst->id) == 0)
		return -EINVAL;

	dst->manager = mgr;
	mgr->output = dst;

	return 0;
}

static void omap_crtc_disconnect(struct omap_overlay_manager *mgr,
		struct omap_dss_device *dst)
{
	mgr->output->manager = NULL;
	mgr->output = NULL;
}

static void omap_crtc_start_update(struct omap_overlay_manager *mgr)
{
}

/* Called only from CRTC pre_apply and suspend/resume handlers. */
static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
{
	struct drm_device *dev = crtc->dev;
	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
	enum omap_channel channel = omap_crtc->channel;
	struct omap_irq_wait *wait;
	u32 framedone_irq, vsync_irq;
	int ret;

	if (dispc_mgr_is_enabled(channel) == enable)
		return;

	/*
	 * Digit output produces some sync lost interrupts during the first
	 * frame when enabling, so we need to ignore those.
	 */
	omap_crtc->ignore_digit_sync_lost = true;

	framedone_irq = dispc_mgr_get_framedone_irq(channel);
	vsync_irq = dispc_mgr_get_vsync_irq(channel);

	if (enable) {
		wait = omap_irq_wait_init(dev, vsync_irq, 1);
	} else {
		/*
		 * When we disable the digit output, we need to wait for
		 * FRAMEDONE to know that DISPC has finished with the output.
		 *
		 * OMAP2/3 does not have FRAMEDONE irq for digit output, and in
		 * that case we need to use vsync interrupt, and wait for both
		 * even and odd frames.
		 */

		if (framedone_irq)
			wait = omap_irq_wait_init(dev, framedone_irq, 1);
		else
			wait = omap_irq_wait_init(dev, vsync_irq, 2);
	}

	dispc_mgr_enable(channel, enable);

	ret = omap_irq_wait(dev, wait, msecs_to_jiffies(100));
	if (ret) {
		dev_err(dev->dev, "%s: timeout waiting for %s\n",
				omap_crtc->name, enable ? "enable" : "disable");
	}

	omap_crtc->ignore_digit_sync_lost = false;
	/* make sure the irq handler sees the value above */
	mb();
}


static int omap_crtc_enable(struct omap_overlay_manager *mgr)
{
	struct omap_crtc *omap_crtc = omap_crtcs[mgr->id];

	dispc_mgr_setup(omap_crtc->channel, &omap_crtc->info);
	dispc_mgr_set_timings(omap_crtc->channel,
			&omap_crtc->timings);
	omap_crtc_set_enabled(&omap_crtc->base, true);

	return 0;
}

static void omap_crtc_disable(struct omap_overlay_manager *mgr)
{
	struct omap_crtc *omap_crtc = omap_crtcs[mgr->id];

	omap_crtc_set_enabled(&omap_crtc->base, false);
}<commit_msg>drm/omap: only ignore DIGIT SYNC LOST for TV output<commit_after>/*
 * drivers/gpu/drm/omapdrm/omap_crtc.c
 *
 * Copyright (C) 2011 Texas Instruments
 * Author: <NAME> <<EMAIL>>
 *
 * 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 "omap_drv.h"

#include <drm/drm_mode.h>
#include <drm/drm_plane_helper.h>
#include "drm_crtc.h"
#include "drm_crtc_helper.h"

#define to_omap_crtc(x) container_of(x, struct omap_crtc, base)

struct omap_crtc {
	struct drm_crtc base;

	const char *name;
	int pipe;
	enum omap_channel channel;
	struct omap_overlay_manager_info info;
	struct drm_encoder *current_encoder;

	/*
	 * Temporary: eventually this will go away, but it is needed
	 * for now to keep the output's happy.  (They only need
	 * mgr->id.)  Eventually this will be replaced w/ something
	 * more common-panel-framework-y
	 */
	struct omap_overlay_manager *mgr;

	struct omap_video_timings timings;
	bool enabled;

	struct omap_drm_apply apply;

	struct omap_drm_irq apply_irq;
	struct omap_drm_irq error_irq;

	/* list of in-progress apply's: */
	struct list_head pending_applies;

	/* list of queued apply's: */
	struct list_head queued_applies;

	/* for handling queued and in-progress applies: */
	struct work_struct apply_work;

	/* if there is a pending flip, these will be non-null: */
	struct drm_pending_vblank_event *event;
	struct drm_framebuffer *old_fb;

	/* for handling page flips without caring about what
	 * the callback is called from.  Possibly we should just
	 * make omap_gem always call the cb from the worker so
	 * we don't have to care about this..
	 *
	 * XXX maybe fold into apply_work??
	 */
	struct work_struct page_flip_work;

	bool ignore_digit_sync_lost;
};

/* -----------------------------------------------------------------------------
 * Helper Functions
 */

uint32_t pipe2vbl(struct drm_crtc *crtc)
{
	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);

	return dispc_mgr_get_vsync_irq(omap_crtc->channel);
}

const struct omap_video_timings *omap_crtc_timings(struct drm_crtc *crtc)
{
	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
	return &omap_crtc->timings;
}

enum omap_channel omap_crtc_channel(struct drm_crtc *crtc)
{
	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
	return omap_crtc->channel;
}

/* -----------------------------------------------------------------------------
 * DSS Manager Functions
 */

/*
 * Manager-ops, callbacks from output when they need to configure
 * the upstream part of the video pipe.
 *
 * Most of these we can ignore until we add support for command-mode
 * panels.. for video-mode the crtc-helpers already do an adequate
 * job of sequencing the setup of the video pipe in the proper order
 */

/* ovl-mgr-id -> crtc */
static struct omap_crtc *omap_crtcs[8];

/* we can probably ignore these until we support command-mode panels: */
static int omap_crtc_connect(struct omap_overlay_manager *mgr,
		struct omap_dss_device *dst)
{
	if (mgr->output)
		return -EINVAL;

	if ((mgr->supported_outputs & dst->id) == 0)
		return -EINVAL;

	dst->manager = mgr;
	mgr->output = dst;

	return 0;
}

static void omap_crtc_disconnect(struct omap_overlay_manager *mgr,
		struct omap_dss_device *dst)
{
	mgr->output->manager = NULL;
	mgr->output = NULL;
}

static void omap_crtc_start_update(struct omap_overlay_manager *mgr)
{
}

/* Called only from CRTC pre_apply and suspend/resume handlers. */
static void omap_crtc_set_enabled(struct drm_crtc *crtc, bool enable)
{
	struct drm_device *dev = crtc->dev;
	struct omap_crtc *omap_crtc = to_omap_crtc(crtc);
	enum omap_channel channel = omap_crtc->channel;
	struct omap_irq_wait *wait;
	u32 framedone_irq, vsync_irq;
	int ret;

	if (dispc_mgr_is_enabled(channel) == enable)
		return;

	if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
		/*
		 * Digit output produces some sync lost interrupts during the
		 * first frame when enabling, so we need to ignore those.
		 */
		omap_crtc->ignore_digit_sync_lost = true;
	}

	framedone_irq = dispc_mgr_get_framedone_irq(channel);
	vsync_irq = dispc_mgr_get_vsync_irq(channel);

	if (enable) {
		wait = omap_irq_wait_init(dev, vsync_irq, 1);
	} else {
		/*
		 * When we disable the digit output, we need to wait for
		 * FRAMEDONE to know that DISPC has finished with the output.
		 *
		 * OMAP2/3 does not have FRAMEDONE irq for digit output, and in
		 * that case we need to use vsync interrupt, and wait for both
		 * even and odd frames.
		 */

		if (framedone_irq)
			wait = omap_irq_wait_init(dev, framedone_irq, 1);
		else
			wait = omap_irq_wait_init(dev, vsync_irq, 2);
	}

	dispc_mgr_enable(channel, enable);

	ret = omap_irq_wait(dev, wait, msecs_to_jiffies(100));
	if (ret) {
		dev_err(dev->dev, "%s: timeout waiting for %s\n",
				omap_crtc->name, enable ? "enable" : "disable");
	}

	if (omap_crtc->channel == OMAP_DSS_CHANNEL_DIGIT) {
		omap_crtc->ignore_digit_sync_lost = false;
		/* make sure the irq handler sees the value above */
		mb();
	}
}


static int omap_crtc_enable(struct omap_overlay_manager *mgr)
{
	struct omap_crtc *omap_crtc = omap_crtcs[mgr->id];

	dispc_mgr_setup(omap_crtc->channel, &omap_crtc->info);
	dispc_mgr_set_timings(omap_crtc->channel,
			&omap_crtc->timings);
	omap_crtc_set_enabled(&omap_crtc->base, true);

	return 0;
}

static void omap_crtc_disable(struct omap_overlay_manager *mgr)
{
	struct omap_crtc *omap_crtc = omap_crtcs[mgr->id];

	omap_crtc_set_enabled(&omap_crtc->base, false);
}
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