kernel/drivers/staging/imgtec/tc/drm_pdp_plane.c

/* -*- mode: c; indent-tabs-mode: t; c-basic-offset: 8; tab-width: 8 -*- */
/* vi: set ts=8 sw=8 sts=8: */
/*************************************************************************/ /*!
@File
@Codingstyle    LinuxKernel
@Copyright      Copyright (c) Imagination Technologies Ltd. All Rights Reserved
@License        MIT

The contents of this file are subject to the MIT license as set out below.

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 shall be included in
all copies or substantial portions of the Software.

This License is also included in this distribution in the file called
"MIT-COPYING".

EXCEPT AS OTHERWISE STATED IN A NEGOTIATED AGREEMENT: (A) 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; AND (B) IN NO EVENT SHALL THE AUTHORS OR
COPYRIGHT HOLDERS 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 "drm_pdp_drv.h"

#include <drm/drmP.h>
#include <drm/drm_plane_helper.h>

#if defined(PDP_USE_ATOMIC)
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_gem_framebuffer_helper.h>
#endif

#include "drm_pdp_gem.h"
#include "pdp_apollo.h"
#include "pdp_odin.h"
#include "pdp_plato.h"

#include "kernel_compatibility.h"


#if defined(PDP_USE_ATOMIC)
static int pdp_plane_helper_atomic_check(struct drm_plane *plane,
					 struct drm_plane_state *state)
{
	struct drm_crtc_state *crtc_new_state;

	if (!state->crtc)
		return 0;

	crtc_new_state = drm_atomic_get_new_crtc_state(state->state,
						       state->crtc);

	return drm_atomic_helper_check_plane_state(state, crtc_new_state,
						   DRM_PLANE_HELPER_NO_SCALING,
						   DRM_PLANE_HELPER_NO_SCALING,
						   false, true);
}

static void pdp_plane_helper_atomic_update(struct drm_plane *plane,
					   struct drm_plane_state *old_state)
{
	struct drm_plane_state *plane_state = plane->state;
	struct drm_framebuffer *fb = plane_state->fb;

	if (fb) {
		pdp_plane_set_surface(plane_state->crtc, plane, fb,
				      plane_state->src_x, plane_state->src_y);
	}
}

static const struct drm_plane_helper_funcs pdp_plane_helper_funcs = {
       .prepare_fb =  drm_gem_fb_prepare_fb,
       .atomic_check = pdp_plane_helper_atomic_check,
       .atomic_update = pdp_plane_helper_atomic_update,
};

static const struct drm_plane_funcs pdp_plane_funcs = {
       .update_plane = drm_atomic_helper_update_plane,
       .disable_plane = drm_atomic_helper_disable_plane,
       .destroy = drm_primary_helper_destroy,
       .reset = drm_atomic_helper_plane_reset,
       .atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
       .atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
};
#else
#define pdp_plane_funcs drm_primary_helper_funcs
#endif

struct drm_plane *pdp_plane_create(struct drm_device *dev,
				   enum drm_plane_type type)
{
	struct drm_plane *plane;
	const uint32_t supported_formats[] = {
		DRM_FORMAT_XRGB8888,
		DRM_FORMAT_ARGB8888,
	};
	int err;

	plane = kzalloc(sizeof(*plane), GFP_KERNEL);
	if (!plane) {
		err = -ENOMEM;
		goto err_exit;
	}

	err = drm_universal_plane_init(dev, plane, 0, &pdp_plane_funcs,
				       supported_formats,
				       ARRAY_SIZE(supported_formats),
				       NULL, type, NULL);
	if (err)
		goto err_plane_free;

#if defined(PDP_USE_ATOMIC)
	drm_plane_helper_add(plane, &pdp_plane_helper_funcs);
#endif

	DRM_DEBUG_DRIVER("[PLANE:%d]\n", plane->base.id);

	return plane;

err_plane_free:
	kfree(plane);
err_exit:
	return ERR_PTR(err);
}

void pdp_plane_set_surface(struct drm_crtc *crtc, struct drm_plane *plane,
			   struct drm_framebuffer *fb,
			   const uint32_t src_x, const uint32_t src_y)
{
	struct pdp_drm_private *dev_priv = plane->dev->dev_private;
	struct pdp_crtc *pdp_crtc = to_pdp_crtc(crtc);
	struct pdp_framebuffer *pdp_fb = to_pdp_framebuffer(fb);
	unsigned int pitch = fb->pitches[0];
	uint64_t address = pdp_gem_get_dev_addr(pdp_fb->obj[0]);

	/*
	 * User space specifies 'x' and 'y' and this is used to tell the display
	 * to scan out from part way through a buffer.
	 */
	address += ((src_y * pitch) + (src_x * (pdp_drm_fb_cpp(fb))));

	/*
	 * NOTE: If the buffer dimensions are less than the current mode then
	 * the output will appear in the top left of the screen. This can be
	 * centered by adjusting horizontal active start, right border start,
	 * vertical active start and bottom border start. At this point it's
	 * not entirely clear where this should be done. On the one hand it's
	 * related to pdp_crtc_helper_mode_set but on the other hand there
	 * might not always be a call to pdp_crtc_helper_mode_set. This needs
	 * to be investigated.
	 */
	switch (dev_priv->version) {
	case PDP_VERSION_APOLLO:
		switch (pdp_drm_fb_format(fb)) {
		case DRM_FORMAT_ARGB8888:
		case DRM_FORMAT_XRGB8888:
			break;
		default:
			DRM_ERROR("unsupported pixel format (format = %d)\n",
				  pdp_drm_fb_format(fb));
			return;
		}

		pdp_apollo_set_surface(plane->dev->dev,
				       pdp_crtc->pdp_reg,
				       0,
				       address,
				       0, 0,
				       fb->width, fb->height, pitch,
				       0xE,
				       255,
				       false);
		break;
	case PDP_VERSION_ODIN:
		switch (pdp_drm_fb_format(fb)) {
		case DRM_FORMAT_ARGB8888:
		case DRM_FORMAT_XRGB8888:
			break;
		default:
			DRM_ERROR("unsupported pixel format (format = %d)\n",
				  pdp_drm_fb_format(fb));
			return;
		}

		pdp_odin_set_surface(plane->dev->dev,
				     pdp_crtc->pdp_reg,
				     0,
				     address,
				     0, 0,
				     fb->width, fb->height, pitch,
				     ODN_PDP_SURF_PIXFMT_ARGB8888,
				     255,
				     false);
		break;
	case PDP_VERSION_PLATO:
		switch (pdp_drm_fb_format(fb)) {
		case DRM_FORMAT_ARGB8888:
		case DRM_FORMAT_XRGB8888:
			break;
		default:
			DRM_ERROR("unsupported pixel format (format = %d)\n",
				  pdp_drm_fb_format(fb));
			return;
		}

		pdp_plato_set_surface(crtc->dev->dev,
				      pdp_crtc->pdp_reg,
				      pdp_crtc->pdp_bif_reg,
				      0,
				      address,
				      0, 0,
				      fb->width, fb->height, pitch,
				      PLATO_PDP_PIXEL_FORMAT_ARGB8,
				      255,
				      false);
		break;
		default:
			BUG();
	}
}