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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2012 Red Hat
*
* based in parts on udlfb.c:
* Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
* Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
* Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
*/
#include <linux/moduleparam.h>
#include <linux/dma-buf.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_gem_shmem_helper.h>
#include "udl_drv.h"
/** Read the red component (0..255) of a 32 bpp colour. */
#define DLO_RGB_GETRED(col) (uint8_t)((col) & 0xFF)
/** Read the green component (0..255) of a 32 bpp colour. */
#define DLO_RGB_GETGRN(col) (uint8_t)(((col) >> 8) & 0xFF)
/** Read the blue component (0..255) of a 32 bpp colour. */
#define DLO_RGB_GETBLU(col) (uint8_t)(((col) >> 16) & 0xFF)
/** Return red/green component of a 16 bpp colour number. */
#define DLO_RG16(red, grn) (uint8_t)((((red) & 0xF8) | ((grn) >> 5)) & 0xFF)
/** Return green/blue component of a 16 bpp colour number. */
#define DLO_GB16(grn, blu) (uint8_t)(((((grn) & 0x1C) << 3) | ((blu) >> 3)) & 0xFF)
/** Return 8 bpp colour number from red, green and blue components. */
#define DLO_RGB8(red, grn, blu) ((((red) << 5) | (((grn) & 3) << 3) | ((blu) & 7)) & 0xFF)
#if 0
static uint8_t rgb8(uint32_t col)
{
uint8_t red = DLO_RGB_GETRED(col);
uint8_t grn = DLO_RGB_GETGRN(col);
uint8_t blu = DLO_RGB_GETBLU(col);
return DLO_RGB8(red, grn, blu);
}
static uint16_t rgb16(uint32_t col)
{
uint8_t red = DLO_RGB_GETRED(col);
uint8_t grn = DLO_RGB_GETGRN(col);
uint8_t blu = DLO_RGB_GETBLU(col);
return (DLO_RG16(red, grn) << 8) + DLO_GB16(grn, blu);
}
#endif
static long udl_log_cpp(unsigned int cpp)
{
if (WARN_ON(!is_power_of_2(cpp)))
return -EINVAL;
return __ffs(cpp);
}
static int udl_aligned_damage_clip(struct drm_rect *clip, int x, int y,
int width, int height)
{
int x1, x2;
if (WARN_ON_ONCE(x < 0) ||
WARN_ON_ONCE(y < 0) ||
WARN_ON_ONCE(width < 0) ||
WARN_ON_ONCE(height < 0))
return -EINVAL;
x1 = ALIGN_DOWN(x, sizeof(unsigned long));
x2 = ALIGN(width + (x - x1), sizeof(unsigned long)) + x1;
clip->x1 = x1;
clip->y1 = y;
clip->x2 = x2;
clip->y2 = y + height;
return 0;
}
int udl_handle_damage(struct drm_framebuffer *fb, int x, int y,
int width, int height)
{
struct drm_device *dev = fb->dev;
struct dma_buf_attachment *import_attach = fb->obj[0]->import_attach;
int i, ret, tmp_ret;
char *cmd;
struct urb *urb;
struct drm_rect clip;
int log_bpp;
void *vaddr;
ret = udl_log_cpp(fb->format->cpp[0]);
if (ret < 0)
return ret;
log_bpp = ret;
ret = udl_aligned_damage_clip(&clip, x, y, width, height);
if (ret)
return ret;
else if ((clip.x2 > fb->width) || (clip.y2 > fb->height))
return -EINVAL;
if (import_attach) {
ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
DMA_FROM_DEVICE);
if (ret)
return ret;
}
vaddr = drm_gem_shmem_vmap(fb->obj[0]);
if (IS_ERR(vaddr)) {
DRM_ERROR("failed to vmap fb\n");
goto out_dma_buf_end_cpu_access;
}
urb = udl_get_urb(dev);
if (!urb)
goto out_drm_gem_shmem_vunmap;
cmd = urb->transfer_buffer;
for (i = clip.y1; i < clip.y2; i++) {
const int line_offset = fb->pitches[0] * i;
const int byte_offset = line_offset + (clip.x1 << log_bpp);
const int dev_byte_offset = (fb->width * i + clip.x1) << log_bpp;
const int byte_width = (clip.x2 - clip.x1) << log_bpp;
ret = udl_render_hline(dev, log_bpp, &urb, (char *)vaddr,
&cmd, byte_offset, dev_byte_offset,
byte_width);
if (ret)
goto out_drm_gem_shmem_vunmap;
}
if (cmd > (char *) urb->transfer_buffer) {
/* Send partial buffer remaining before exiting */
int len;
if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)
*cmd++ = 0xAF;
len = cmd - (char *) urb->transfer_buffer;
ret = udl_submit_urb(dev, urb, len);
} else
udl_urb_completion(urb);
ret = 0;
out_drm_gem_shmem_vunmap:
drm_gem_shmem_vunmap(fb->obj[0], vaddr);
out_dma_buf_end_cpu_access:
if (import_attach) {
tmp_ret = dma_buf_end_cpu_access(import_attach->dmabuf,
DMA_FROM_DEVICE);
if (tmp_ret && !ret)
ret = tmp_ret; /* only update ret if not set yet */
}
return ret;
}
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