99 lines
2.6 KiB
C
99 lines
2.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* drm kms/fb cma (contiguous memory allocator) helper functions
|
|
*
|
|
* Copyright (C) 2012 Analog Device Inc.
|
|
* Author: Lars-Peter Clausen <lars@metafoo.de>
|
|
*
|
|
* Based on udl_fbdev.c
|
|
* Copyright (C) 2012 Red Hat
|
|
*/
|
|
|
|
#include <drm/drm_fourcc.h>
|
|
#include <drm/drm_framebuffer.h>
|
|
#include <drm/drm_gem_cma_helper.h>
|
|
#include <drm/drm_gem_framebuffer_helper.h>
|
|
#include <drm/drm_plane.h>
|
|
#include <linux/module.h>
|
|
|
|
/**
|
|
* DOC: framebuffer cma helper functions
|
|
*
|
|
* Provides helper functions for creating a cma (contiguous memory allocator)
|
|
* backed framebuffer.
|
|
*
|
|
* drm_gem_fb_create() is used in the &drm_mode_config_funcs.fb_create
|
|
* callback function to create a cma backed framebuffer.
|
|
*/
|
|
|
|
/**
|
|
* drm_fb_cma_get_gem_obj() - Get CMA GEM object for framebuffer
|
|
* @fb: The framebuffer
|
|
* @plane: Which plane
|
|
*
|
|
* Return the CMA GEM object for given framebuffer.
|
|
*
|
|
* This function will usually be called from the CRTC callback functions.
|
|
*/
|
|
struct drm_gem_cma_object *drm_fb_cma_get_gem_obj(struct drm_framebuffer *fb,
|
|
unsigned int plane)
|
|
{
|
|
struct drm_gem_object *gem;
|
|
|
|
gem = drm_gem_fb_get_obj(fb, plane);
|
|
if (!gem)
|
|
return NULL;
|
|
|
|
return to_drm_gem_cma_obj(gem);
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_obj);
|
|
|
|
/**
|
|
* drm_fb_cma_get_gem_addr() - Get physical address for framebuffer, for pixel
|
|
* formats where values are grouped in blocks this will get you the beginning of
|
|
* the block
|
|
* @fb: The framebuffer
|
|
* @state: Which state of drm plane
|
|
* @plane: Which plane
|
|
* Return the CMA GEM address for given framebuffer.
|
|
*
|
|
* This function will usually be called from the PLANE callback functions.
|
|
*/
|
|
dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb,
|
|
struct drm_plane_state *state,
|
|
unsigned int plane)
|
|
{
|
|
struct drm_gem_cma_object *obj;
|
|
dma_addr_t paddr;
|
|
u8 h_div = 1, v_div = 1;
|
|
u32 block_w = drm_format_info_block_width(fb->format, plane);
|
|
u32 block_h = drm_format_info_block_height(fb->format, plane);
|
|
u32 block_size = fb->format->char_per_block[plane];
|
|
u32 sample_x;
|
|
u32 sample_y;
|
|
u32 block_start_y;
|
|
u32 num_hblocks;
|
|
|
|
obj = drm_fb_cma_get_gem_obj(fb, plane);
|
|
if (!obj)
|
|
return 0;
|
|
|
|
paddr = obj->paddr + fb->offsets[plane];
|
|
|
|
if (plane > 0) {
|
|
h_div = fb->format->hsub;
|
|
v_div = fb->format->vsub;
|
|
}
|
|
|
|
sample_x = (state->src_x >> 16) / h_div;
|
|
sample_y = (state->src_y >> 16) / v_div;
|
|
block_start_y = (sample_y / block_h) * block_h;
|
|
num_hblocks = sample_x / block_w;
|
|
|
|
paddr += fb->pitches[plane] * block_start_y;
|
|
paddr += block_size * num_hblocks;
|
|
|
|
return paddr;
|
|
}
|
|
EXPORT_SYMBOL_GPL(drm_fb_cma_get_gem_addr);
|