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linux/drivers/gpu/drm/drm_format_helper.c
Javier Martinez Canillas bcf8b616de
drm/format-helper: Add drm_fb_xrgb8888_to_mono_reversed() 
Add support to convert from XR24 to reversed monochrome for drivers that
control monochromatic display panels, that only have 1 bit per pixel.

The function does a line-by-line conversion doing an intermediate step
first from XR24 to 8-bit grayscale and then to reversed monochrome.

The drm_fb_gray8_to_mono_reversed_line() helper was based on code from
drivers/gpu/drm/tiny/repaper.c driver.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220214133710.3278506-3-javierm@redhat.com
2022-02-16 13:29:04 +01:00

704 lines
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// SPDX-License-Identifier: GPL-2.0 or MIT
/*
* Copyright (C) 2016 Noralf Trønnes
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/io.h>
#include <drm/drm_device.h>
#include <drm/drm_format_helper.h>
#include <drm/drm_framebuffer.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_print.h>
#include <drm/drm_rect.h>
static unsigned int clip_offset(const struct drm_rect *clip, unsigned int pitch, unsigned int cpp)
{
return clip->y1 * pitch + clip->x1 * cpp;
}
/**
* drm_fb_clip_offset - Returns the clipping rectangles byte-offset in a framebuffer
* @pitch: Framebuffer line pitch in byte
* @format: Framebuffer format
* @clip: Clip rectangle
*
* Returns:
* The byte offset of the clip rectangle's top-left corner within the framebuffer.
*/
unsigned int drm_fb_clip_offset(unsigned int pitch, const struct drm_format_info *format,
const struct drm_rect *clip)
{
return clip_offset(clip, pitch, format->cpp[0]);
}
EXPORT_SYMBOL(drm_fb_clip_offset);
/**
* drm_fb_memcpy - Copy clip buffer
* @dst: Destination buffer
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @vaddr: Source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function does not apply clipping on dst, i.e. the destination
* is at the top-left corner.
*/
void drm_fb_memcpy(void *dst, unsigned int dst_pitch, const void *vaddr,
const struct drm_framebuffer *fb, const struct drm_rect *clip)
{
unsigned int cpp = fb->format->cpp[0];
size_t len = (clip->x2 - clip->x1) * cpp;
unsigned int y, lines = clip->y2 - clip->y1;
if (!dst_pitch)
dst_pitch = len;
vaddr += clip_offset(clip, fb->pitches[0], cpp);
for (y = 0; y < lines; y++) {
memcpy(dst, vaddr, len);
vaddr += fb->pitches[0];
dst += dst_pitch;
}
}
EXPORT_SYMBOL(drm_fb_memcpy);
/**
* drm_fb_memcpy_toio - Copy clip buffer
* @dst: Destination buffer (iomem)
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @vaddr: Source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* This function does not apply clipping on dst, i.e. the destination
* is at the top-left corner.
*/
void drm_fb_memcpy_toio(void __iomem *dst, unsigned int dst_pitch, const void *vaddr,
const struct drm_framebuffer *fb, const struct drm_rect *clip)
{
unsigned int cpp = fb->format->cpp[0];
size_t len = (clip->x2 - clip->x1) * cpp;
unsigned int y, lines = clip->y2 - clip->y1;
if (!dst_pitch)
dst_pitch = len;
vaddr += clip_offset(clip, fb->pitches[0], cpp);
for (y = 0; y < lines; y++) {
memcpy_toio(dst, vaddr, len);
vaddr += fb->pitches[0];
dst += dst_pitch;
}
}
EXPORT_SYMBOL(drm_fb_memcpy_toio);
/**
* drm_fb_swab - Swap bytes into clip buffer
* @dst: Destination buffer
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @src: Source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
* @cached: Source buffer is mapped cached (eg. not write-combined)
*
* If @cached is false a temporary buffer is used to cache one pixel line at a
* time to speed up slow uncached reads.
*
* This function does not apply clipping on dst, i.e. the destination
* is at the top-left corner.
*/
void drm_fb_swab(void *dst, unsigned int dst_pitch, const void *src,
const struct drm_framebuffer *fb, const struct drm_rect *clip,
bool cached)
{
u8 cpp = fb->format->cpp[0];
size_t len = drm_rect_width(clip) * cpp;
const u16 *src16;
const u32 *src32;
u16 *dst16;
u32 *dst32;
unsigned int x, y;
void *buf = NULL;
if (WARN_ON_ONCE(cpp != 2 && cpp != 4))
return;
if (!dst_pitch)
dst_pitch = len;
if (!cached)
buf = kmalloc(len, GFP_KERNEL);
src += clip_offset(clip, fb->pitches[0], cpp);
for (y = clip->y1; y < clip->y2; y++) {
if (buf) {
memcpy(buf, src, len);
src16 = buf;
src32 = buf;
} else {
src16 = src;
src32 = src;
}
dst16 = dst;
dst32 = dst;
for (x = clip->x1; x < clip->x2; x++) {
if (cpp == 4)
*dst32++ = swab32(*src32++);
else
*dst16++ = swab16(*src16++);
}
src += fb->pitches[0];
dst += dst_pitch;
}
kfree(buf);
}
EXPORT_SYMBOL(drm_fb_swab);
static void drm_fb_xrgb8888_to_rgb332_line(u8 *dbuf, const __le32 *sbuf, unsigned int pixels)
{
unsigned int x;
u32 pix;
for (x = 0; x < pixels; x++) {
pix = le32_to_cpu(sbuf[x]);
dbuf[x] = ((pix & 0x00e00000) >> 16) |
((pix & 0x0000e000) >> 11) |
((pix & 0x000000c0) >> 6);
}
}
/**
* drm_fb_xrgb8888_to_rgb332 - Convert XRGB8888 to RGB332 clip buffer
* @dst: RGB332 destination buffer
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @src: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* Drivers can use this function for RGB332 devices that don't natively support XRGB8888.
*/
void drm_fb_xrgb8888_to_rgb332(void *dst, unsigned int dst_pitch, const void *src,
const struct drm_framebuffer *fb, const struct drm_rect *clip)
{
size_t width = drm_rect_width(clip);
size_t src_len = width * sizeof(u32);
unsigned int y;
void *sbuf;
if (!dst_pitch)
dst_pitch = width;
/* Use a buffer to speed up access on buffers with uncached read mapping (i.e. WC) */
sbuf = kmalloc(src_len, GFP_KERNEL);
if (!sbuf)
return;
src += clip_offset(clip, fb->pitches[0], sizeof(u32));
for (y = 0; y < drm_rect_height(clip); y++) {
memcpy(sbuf, src, src_len);
drm_fb_xrgb8888_to_rgb332_line(dst, sbuf, width);
src += fb->pitches[0];
dst += dst_pitch;
}
kfree(sbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb332);
static void drm_fb_xrgb8888_to_rgb565_line(u16 *dbuf, const u32 *sbuf,
unsigned int pixels,
bool swab)
{
unsigned int x;
u16 val16;
for (x = 0; x < pixels; x++) {
val16 = ((sbuf[x] & 0x00F80000) >> 8) |
((sbuf[x] & 0x0000FC00) >> 5) |
((sbuf[x] & 0x000000F8) >> 3);
if (swab)
dbuf[x] = swab16(val16);
else
dbuf[x] = val16;
}
}
/**
* drm_fb_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer
* @dst: RGB565 destination buffer
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @vaddr: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
* @swab: Swap bytes
*
* Drivers can use this function for RGB565 devices that don't natively
* support XRGB8888.
*/
void drm_fb_xrgb8888_to_rgb565(void *dst, unsigned int dst_pitch, const void *vaddr,
const struct drm_framebuffer *fb, const struct drm_rect *clip,
bool swab)
{
size_t linepixels = clip->x2 - clip->x1;
size_t src_len = linepixels * sizeof(u32);
size_t dst_len = linepixels * sizeof(u16);
unsigned y, lines = clip->y2 - clip->y1;
void *sbuf;
if (!dst_pitch)
dst_pitch = dst_len;
/*
* The cma memory is write-combined so reads are uncached.
* Speed up by fetching one line at a time.
*/
sbuf = kmalloc(src_len, GFP_KERNEL);
if (!sbuf)
return;
vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
for (y = 0; y < lines; y++) {
memcpy(sbuf, vaddr, src_len);
drm_fb_xrgb8888_to_rgb565_line(dst, sbuf, linepixels, swab);
vaddr += fb->pitches[0];
dst += dst_pitch;
}
kfree(sbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565);
/**
* drm_fb_xrgb8888_to_rgb565_toio - Convert XRGB8888 to RGB565 clip buffer
* @dst: RGB565 destination buffer (iomem)
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @vaddr: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
* @swab: Swap bytes
*
* Drivers can use this function for RGB565 devices that don't natively
* support XRGB8888.
*/
void drm_fb_xrgb8888_to_rgb565_toio(void __iomem *dst, unsigned int dst_pitch,
const void *vaddr, const struct drm_framebuffer *fb,
const struct drm_rect *clip, bool swab)
{
size_t linepixels = clip->x2 - clip->x1;
size_t dst_len = linepixels * sizeof(u16);
unsigned y, lines = clip->y2 - clip->y1;
void *dbuf;
if (!dst_pitch)
dst_pitch = dst_len;
dbuf = kmalloc(dst_len, GFP_KERNEL);
if (!dbuf)
return;
vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
for (y = 0; y < lines; y++) {
drm_fb_xrgb8888_to_rgb565_line(dbuf, vaddr, linepixels, swab);
memcpy_toio(dst, dbuf, dst_len);
vaddr += fb->pitches[0];
dst += dst_pitch;
}
kfree(dbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb565_toio);
static void drm_fb_xrgb8888_to_rgb888_line(u8 *dbuf, const u32 *sbuf,
unsigned int pixels)
{
unsigned int x;
for (x = 0; x < pixels; x++) {
*dbuf++ = (sbuf[x] & 0x000000FF) >> 0;
*dbuf++ = (sbuf[x] & 0x0000FF00) >> 8;
*dbuf++ = (sbuf[x] & 0x00FF0000) >> 16;
}
}
/**
* drm_fb_xrgb8888_to_rgb888 - Convert XRGB8888 to RGB888 clip buffer
* @dst: RGB888 destination buffer
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @src: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* Drivers can use this function for RGB888 devices that don't natively
* support XRGB8888.
*/
void drm_fb_xrgb8888_to_rgb888(void *dst, unsigned int dst_pitch, const void *src,
const struct drm_framebuffer *fb, const struct drm_rect *clip)
{
size_t width = drm_rect_width(clip);
size_t src_len = width * sizeof(u32);
unsigned int y;
void *sbuf;
if (!dst_pitch)
dst_pitch = width * 3;
/* Use a buffer to speed up access on buffers with uncached read mapping (i.e. WC) */
sbuf = kmalloc(src_len, GFP_KERNEL);
if (!sbuf)
return;
src += clip_offset(clip, fb->pitches[0], sizeof(u32));
for (y = 0; y < drm_rect_height(clip); y++) {
memcpy(sbuf, src, src_len);
drm_fb_xrgb8888_to_rgb888_line(dst, sbuf, width);
src += fb->pitches[0];
dst += dst_pitch;
}
kfree(sbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888);
/**
* drm_fb_xrgb8888_to_rgb888_toio - Convert XRGB8888 to RGB888 clip buffer
* @dst: RGB565 destination buffer (iomem)
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @vaddr: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* Drivers can use this function for RGB888 devices that don't natively
* support XRGB8888.
*/
void drm_fb_xrgb8888_to_rgb888_toio(void __iomem *dst, unsigned int dst_pitch,
const void *vaddr, const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
size_t linepixels = clip->x2 - clip->x1;
size_t dst_len = linepixels * 3;
unsigned y, lines = clip->y2 - clip->y1;
void *dbuf;
if (!dst_pitch)
dst_pitch = dst_len;
dbuf = kmalloc(dst_len, GFP_KERNEL);
if (!dbuf)
return;
vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
for (y = 0; y < lines; y++) {
drm_fb_xrgb8888_to_rgb888_line(dbuf, vaddr, linepixels);
memcpy_toio(dst, dbuf, dst_len);
vaddr += fb->pitches[0];
dst += dst_pitch;
}
kfree(dbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_rgb888_toio);
static void drm_fb_xrgb8888_to_xrgb2101010_line(u32 *dbuf, const u32 *sbuf,
unsigned int pixels)
{
unsigned int x;
u32 val32;
for (x = 0; x < pixels; x++) {
val32 = ((sbuf[x] & 0x000000FF) << 2) |
((sbuf[x] & 0x0000FF00) << 4) |
((sbuf[x] & 0x00FF0000) << 6);
*dbuf++ = val32 | ((val32 >> 8) & 0x00300C03);
}
}
/**
* drm_fb_xrgb8888_to_xrgb2101010_toio - Convert XRGB8888 to XRGB2101010 clip
* buffer
* @dst: XRGB2101010 destination buffer (iomem)
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @vaddr: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* Drivers can use this function for XRGB2101010 devices that don't natively
* support XRGB8888.
*/
void drm_fb_xrgb8888_to_xrgb2101010_toio(void __iomem *dst,
unsigned int dst_pitch, const void *vaddr,
const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
size_t linepixels = clip->x2 - clip->x1;
size_t dst_len = linepixels * sizeof(u32);
unsigned int y, lines = clip->y2 - clip->y1;
void *dbuf;
if (!dst_pitch)
dst_pitch = dst_len;
dbuf = kmalloc(dst_len, GFP_KERNEL);
if (!dbuf)
return;
vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
for (y = 0; y < lines; y++) {
drm_fb_xrgb8888_to_xrgb2101010_line(dbuf, vaddr, linepixels);
memcpy_toio(dst, dbuf, dst_len);
vaddr += fb->pitches[0];
dst += dst_pitch;
}
kfree(dbuf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_xrgb2101010_toio);
static void drm_fb_xrgb8888_to_gray8_line(u8 *dst, const u32 *src, unsigned int pixels)
{
unsigned int x;
for (x = 0; x < pixels; x++) {
u8 r = (*src & 0x00ff0000) >> 16;
u8 g = (*src & 0x0000ff00) >> 8;
u8 b = *src & 0x000000ff;
/* ITU BT.601: Y = 0.299 R + 0.587 G + 0.114 B */
*dst++ = (3 * r + 6 * g + b) / 10;
src++;
}
}
/**
* drm_fb_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale
* @dst: 8-bit grayscale destination buffer
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @vaddr: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* Drm doesn't have native monochrome or grayscale support.
* Such drivers can announce the commonly supported XR24 format to userspace
* and use this function to convert to the native format.
*
* Monochrome drivers will use the most significant bit,
* where 1 means foreground color and 0 background color.
*
* ITU BT.601 is used for the RGB -> luma (brightness) conversion.
*/
void drm_fb_xrgb8888_to_gray8(void *dst, unsigned int dst_pitch, const void *vaddr,
const struct drm_framebuffer *fb, const struct drm_rect *clip)
{
unsigned int linepixels = clip->x2 - clip->x1;
unsigned int len = linepixels * sizeof(u32);
unsigned int y;
void *buf;
u8 *dst8;
u32 *src32;
if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888))
return;
if (!dst_pitch)
dst_pitch = drm_rect_width(clip);
/*
* The cma memory is write-combined so reads are uncached.
* Speed up by fetching one line at a time.
*/
buf = kmalloc(len, GFP_KERNEL);
if (!buf)
return;
vaddr += clip_offset(clip, fb->pitches[0], sizeof(u32));
for (y = clip->y1; y < clip->y2; y++) {
dst8 = dst;
src32 = memcpy(buf, vaddr, len);
drm_fb_xrgb8888_to_gray8_line(dst8, src32, linepixels);
vaddr += fb->pitches[0];
dst += dst_pitch;
}
kfree(buf);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_gray8);
/**
* drm_fb_blit_toio - Copy parts of a framebuffer to display memory
* @dst: The display memory to copy to
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @dst_format: FOURCC code of the display's color format
* @vmap: The framebuffer memory to copy from
* @fb: The framebuffer to copy from
* @clip: Clip rectangle area to copy
*
* This function copies parts of a framebuffer to display memory. If the
* formats of the display and the framebuffer mismatch, the blit function
* will attempt to convert between them.
*
* Returns:
* 0 on success, or
* -EINVAL if the color-format conversion failed, or
* a negative error code otherwise.
*/
int drm_fb_blit_toio(void __iomem *dst, unsigned int dst_pitch, uint32_t dst_format,
const void *vmap, const struct drm_framebuffer *fb,
const struct drm_rect *clip)
{
uint32_t fb_format = fb->format->format;
/* treat alpha channel like filler bits */
if (fb_format == DRM_FORMAT_ARGB8888)
fb_format = DRM_FORMAT_XRGB8888;
if (dst_format == DRM_FORMAT_ARGB8888)
dst_format = DRM_FORMAT_XRGB8888;
if (fb_format == DRM_FORMAT_ARGB2101010)
fb_format = DRM_FORMAT_XRGB2101010;
if (dst_format == DRM_FORMAT_ARGB2101010)
dst_format = DRM_FORMAT_XRGB2101010;
if (dst_format == fb_format) {
drm_fb_memcpy_toio(dst, dst_pitch, vmap, fb, clip);
return 0;
} else if (dst_format == DRM_FORMAT_RGB565) {
if (fb_format == DRM_FORMAT_XRGB8888) {
drm_fb_xrgb8888_to_rgb565_toio(dst, dst_pitch, vmap, fb, clip, false);
return 0;
}
} else if (dst_format == DRM_FORMAT_RGB888) {
if (fb_format == DRM_FORMAT_XRGB8888) {
drm_fb_xrgb8888_to_rgb888_toio(dst, dst_pitch, vmap, fb, clip);
return 0;
}
} else if (dst_format == DRM_FORMAT_XRGB2101010) {
if (fb_format == DRM_FORMAT_XRGB8888) {
drm_fb_xrgb8888_to_xrgb2101010_toio(dst, dst_pitch, vmap, fb, clip);
return 0;
}
}
return -EINVAL;
}
EXPORT_SYMBOL(drm_fb_blit_toio);
static void drm_fb_gray8_to_mono_reversed_line(u8 *dst, const u8 *src, unsigned int pixels,
unsigned int start_offset, unsigned int end_len)
{
unsigned int xb, i;
for (xb = 0; xb < pixels; xb++) {
unsigned int start = 0, end = 8;
u8 byte = 0x00;
if (xb == 0 && start_offset)
start = start_offset;
if (xb == pixels - 1 && end_len)
end = end_len;
for (i = start; i < end; i++) {
unsigned int x = xb * 8 + i;
byte >>= 1;
if (src[x] >> 7)
byte |= BIT(7);
}
*dst++ = byte;
}
}
/**
* drm_fb_xrgb8888_to_mono_reversed - Convert XRGB8888 to reversed monochrome
* @dst: reversed monochrome destination buffer
* @dst_pitch: Number of bytes between two consecutive scanlines within dst
* @src: XRGB8888 source buffer
* @fb: DRM framebuffer
* @clip: Clip rectangle area to copy
*
* DRM doesn't have native monochrome support.
* Such drivers can announce the commonly supported XR24 format to userspace
* and use this function to convert to the native format.
*
* This function uses drm_fb_xrgb8888_to_gray8() to convert to grayscale and
* then the result is converted from grayscale to reversed monohrome.
*/
void drm_fb_xrgb8888_to_mono_reversed(void *dst, unsigned int dst_pitch, const void *vaddr,
const struct drm_framebuffer *fb, const struct drm_rect *clip)
{
unsigned int linepixels = drm_rect_width(clip);
unsigned int lines = clip->y2 - clip->y1;
unsigned int cpp = fb->format->cpp[0];
unsigned int len_src32 = linepixels * cpp;
struct drm_device *dev = fb->dev;
unsigned int start_offset, end_len;
unsigned int y;
u8 *mono = dst, *gray8;
u32 *src32;
if (drm_WARN_ON(dev, fb->format->format != DRM_FORMAT_XRGB8888))
return;
/*
* The reversed mono destination buffer contains 1 bit per pixel
* and destination scanlines have to be in multiple of 8 pixels.
*/
if (!dst_pitch)
dst_pitch = DIV_ROUND_UP(linepixels, 8);
drm_WARN_ONCE(dev, dst_pitch % 8 != 0, "dst_pitch is not a multiple of 8\n");
/*
* The cma memory is write-combined so reads are uncached.
* Speed up by fetching one line at a time.
*
* Also, format conversion from XR24 to reversed monochrome
* are done line-by-line but are converted to 8-bit grayscale
* as an intermediate step.
*
* Allocate a buffer to be used for both copying from the cma
* memory and to store the intermediate grayscale line pixels.
*/
src32 = kmalloc(len_src32 + linepixels, GFP_KERNEL);
if (!src32)
return;
gray8 = (u8 *)src32 + len_src32;
/*
* For damage handling, it is possible that only parts of the source
* buffer is copied and this could lead to start and end pixels that
* are not aligned to multiple of 8.
*
* Calculate if the start and end pixels are not aligned and set the
* offsets for the reversed mono line conversion function to adjust.
*/
start_offset = clip->x1 % 8;
end_len = clip->x2 % 8;
vaddr += clip_offset(clip, fb->pitches[0], cpp);
for (y = 0; y < lines; y++) {
src32 = memcpy(src32, vaddr, len_src32);
drm_fb_xrgb8888_to_gray8_line(gray8, src32, linepixels);
drm_fb_gray8_to_mono_reversed_line(mono, gray8, dst_pitch,
start_offset, end_len);
vaddr += fb->pitches[0];
mono += dst_pitch;
}
kfree(src32);
}
EXPORT_SYMBOL(drm_fb_xrgb8888_to_mono_reversed);
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