exynos_drm_crtc.c

/* exynos_drm_crtc.c
 *
 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
 * Authors:
 *	Inki Dae <inki.dae@samsung.com>
 *	Joonyoung Shim <jy0922.shim@samsung.com>
 *	Seung-Woo Kim <sw0312.kim@samsung.com>
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
 * OTHER DEALINGS IN THE SOFTWARE.
 */

#include "drmP.h"
#include "drm_crtc_helper.h"

#include "exynos_drm_drv.h"
#include "exynos_drm_encoder.h"
#include "exynos_drm_plane.h"

#define to_exynos_crtc(x)	container_of(x, struct exynos_drm_crtc,\
				drm_crtc)

/*
 * Exynos specific crtc structure.
 *
 * @drm_crtc: crtc object.
 * @drm_plane: pointer of private plane object for this crtc
 * @pipe: a crtc index created at load() with a new crtc object creation
 *	and the crtc object would be set to private->crtc array
 *	to get a crtc object corresponding to this pipe from private->crtc
 *	array when irq interrupt occured. the reason of using this pipe is that
 *	drm framework doesn't support multiple irq yet.
 *	we can refer to the crtc to current hardware interrupt occured through
 *	this pipe value.
 * @dpms: store the crtc dpms value
 */
struct exynos_drm_crtc {
	struct drm_crtc			drm_crtc;
	struct drm_plane		*plane;
	unsigned int			pipe;
	unsigned int			dpms;
};

static void exynos_drm_crtc_dpms(struct drm_crtc *crtc, int mode)
{
	struct drm_device *dev = crtc->dev;
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	DRM_DEBUG_KMS("crtc[%d] mode[%d]\n", crtc->base.id, mode);

	if (exynos_crtc->dpms == mode) {
		DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
		return;
	}

	mutex_lock(&dev->struct_mutex);

	switch (mode) {
	case DRM_MODE_DPMS_ON:
		exynos_drm_fn_encoder(crtc, &mode,
				exynos_drm_encoder_crtc_dpms);
		exynos_crtc->dpms = mode;
		break;
	case DRM_MODE_DPMS_STANDBY:
	case DRM_MODE_DPMS_SUSPEND:
	case DRM_MODE_DPMS_OFF:
		exynos_drm_fn_encoder(crtc, &mode,
				exynos_drm_encoder_crtc_dpms);
		exynos_crtc->dpms = mode;
		break;
	default:
		DRM_ERROR("unspecified mode %d\n", mode);
		break;
	}

	mutex_unlock(&dev->struct_mutex);
}

static void exynos_drm_crtc_prepare(struct drm_crtc *crtc)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	/* drm framework doesn't check NULL. */
}

static void exynos_drm_crtc_commit(struct drm_crtc *crtc)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	/*
	 * when set_crtc is requested from user or at booting time,
	 * crtc->commit would be called without dpms call so if dpms is
	 * no power on then crtc->dpms should be called
	 * with DRM_MODE_DPMS_ON for the hardware power to be on.
	 */
	if (exynos_crtc->dpms != DRM_MODE_DPMS_ON) {
		int mode = DRM_MODE_DPMS_ON;

		/*
		 * enable hardware(power on) to all encoders hdmi connected
		 * to current crtc.
		 */
		exynos_drm_crtc_dpms(crtc, mode);
		/*
		 * enable dma to all encoders connected to current crtc and
		 * lcd panel.
		 */
		exynos_drm_fn_encoder(crtc, &mode,
					exynos_drm_encoder_dpms_from_crtc);
	}

	exynos_plane_commit(exynos_crtc->plane);
}

static bool
exynos_drm_crtc_mode_fixup(struct drm_crtc *crtc,
			    const struct drm_display_mode *mode,
			    struct drm_display_mode *adjusted_mode)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);

	/* drm framework doesn't check NULL */
	return true;
}

static int
exynos_drm_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode,
			  struct drm_display_mode *adjusted_mode, int x, int y,
			  struct drm_framebuffer *old_fb)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
	struct drm_plane *plane = exynos_crtc->plane;
	unsigned int crtc_w;
	unsigned int crtc_h;
	int pipe = exynos_crtc->pipe;
	int ret;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	/*
	 * copy the mode data adjusted by mode_fixup() into crtc->mode
	 * so that hardware can be seet to proper mode.
	 */
	memcpy(&crtc->mode, adjusted_mode, sizeof(*adjusted_mode));

	crtc_w = crtc->fb->width - x;
	crtc_h = crtc->fb->height - y;

	ret = exynos_plane_mode_set(plane, crtc, crtc->fb, 0, 0, crtc_w, crtc_h,
				    x, y, crtc_w, crtc_h);
	if (ret)
		return ret;

	plane->crtc = crtc;
	plane->fb = crtc->fb;

	exynos_drm_fn_encoder(crtc, &pipe, exynos_drm_encoder_crtc_pipe);

	return 0;
}

static int exynos_drm_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y,
					  struct drm_framebuffer *old_fb)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
	struct drm_plane *plane = exynos_crtc->plane;
	unsigned int crtc_w;
	unsigned int crtc_h;
	int ret;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	crtc_w = crtc->fb->width - x;
	crtc_h = crtc->fb->height - y;

	ret = exynos_plane_mode_set(plane, crtc, crtc->fb, 0, 0, crtc_w, crtc_h,
				    x, y, crtc_w, crtc_h);
	if (ret)
		return ret;

	exynos_plane_commit(exynos_crtc->plane);

	return 0;
}

static void exynos_drm_crtc_load_lut(struct drm_crtc *crtc)
{
	DRM_DEBUG_KMS("%s\n", __FILE__);
	/* drm framework doesn't check NULL */
}

static struct drm_crtc_helper_funcs exynos_crtc_helper_funcs = {
	.dpms		= exynos_drm_crtc_dpms,
	.prepare	= exynos_drm_crtc_prepare,
	.commit		= exynos_drm_crtc_commit,
	.mode_fixup	= exynos_drm_crtc_mode_fixup,
	.mode_set	= exynos_drm_crtc_mode_set,
	.mode_set_base	= exynos_drm_crtc_mode_set_base,
	.load_lut	= exynos_drm_crtc_load_lut,
};

static int exynos_drm_crtc_page_flip(struct drm_crtc *crtc,
				      struct drm_framebuffer *fb,
				      struct drm_pending_vblank_event *event)
{
	struct drm_device *dev = crtc->dev;
	struct exynos_drm_private *dev_priv = dev->dev_private;
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
	struct drm_framebuffer *old_fb = crtc->fb;
	int ret = -EINVAL;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	mutex_lock(&dev->struct_mutex);

	if (event) {
		/*
		 * the pipe from user always is 0 so we can set pipe number
		 * of current owner to event.
		 */
		event->pipe = exynos_crtc->pipe;

		ret = drm_vblank_get(dev, exynos_crtc->pipe);
		if (ret) {
			DRM_DEBUG("failed to acquire vblank counter\n");
			list_del(&event->base.link);

			goto out;
		}

		list_add_tail(&event->base.link,
				&dev_priv->pageflip_event_list);

		crtc->fb = fb;
		ret = exynos_drm_crtc_mode_set_base(crtc, crtc->x, crtc->y,
						    NULL);
		if (ret) {
			crtc->fb = old_fb;
			drm_vblank_put(dev, exynos_crtc->pipe);
			list_del(&event->base.link);

			goto out;
		}
	}
out:
	mutex_unlock(&dev->struct_mutex);
	return ret;
}

static void exynos_drm_crtc_destroy(struct drm_crtc *crtc)
{
	struct exynos_drm_crtc *exynos_crtc = to_exynos_crtc(crtc);
	struct exynos_drm_private *private = crtc->dev->dev_private;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	private->crtc[exynos_crtc->pipe] = NULL;

	drm_crtc_cleanup(crtc);
	kfree(exynos_crtc);
}

static struct drm_crtc_funcs exynos_crtc_funcs = {
	.set_config	= drm_crtc_helper_set_config,
	.page_flip	= exynos_drm_crtc_page_flip,
	.destroy	= exynos_drm_crtc_destroy,
};

int exynos_drm_crtc_create(struct drm_device *dev, unsigned int nr)
{
	struct exynos_drm_crtc *exynos_crtc;
	struct exynos_drm_private *private = dev->dev_private;
	struct drm_crtc *crtc;

	DRM_DEBUG_KMS("%s\n", __FILE__);

	exynos_crtc = kzalloc(sizeof(*exynos_crtc), GFP_KERNEL);
	if (!exynos_crtc) {
		DRM_ERROR("failed to allocate exynos crtc\n");
		return -ENOMEM;
	}

	exynos_crtc->pipe = nr;
	exynos_crtc->dpms = DRM_MODE_DPMS_OFF;
	exynos_crtc->plane = exynos_plane_init(dev, 1 << nr, true);
	if (!exynos_crtc->plane) {
		kfree(exynos_crtc);
		return -ENOMEM;
	}

	crtc = &exynos_crtc->drm_crtc;

	private->crtc[nr] = crtc;

	drm_crtc_init(dev, crtc, &exynos_crtc_funcs);
	drm_crtc_helper_add(crtc, &exynos_crtc_helper_funcs);

	return 0;
}

int exynos_drm_crtc_enable_vblank(struct drm_device *dev, int crtc)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct exynos_drm_crtc *exynos_crtc =
		to_exynos_crtc(private->crtc[crtc]);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
		return -EPERM;

	exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
			exynos_drm_enable_vblank);

	return 0;
}

void exynos_drm_crtc_disable_vblank(struct drm_device *dev, int crtc)
{
	struct exynos_drm_private *private = dev->dev_private;
	struct exynos_drm_crtc *exynos_crtc =
		to_exynos_crtc(private->crtc[crtc]);

	DRM_DEBUG_KMS("%s\n", __FILE__);

	if (exynos_crtc->dpms != DRM_MODE_DPMS_ON)
		return;

	exynos_drm_fn_encoder(private->crtc[crtc], &crtc,
			exynos_drm_disable_vblank);
}