diff options
Diffstat (limited to 'drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c')
| -rw-r--r-- | drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 166 |
1 files changed, 3 insertions, 163 deletions
diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c index 2737b6fdadc8..dfeafac4c656 100644 --- a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c +++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c @@ -1,10 +1,6 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * 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/backlight.h> @@ -26,164 +22,6 @@ static unsigned int spi_max; module_param(spi_max, uint, 0400); MODULE_PARM_DESC(spi_max, "Set a lower SPI max transfer size"); -/** - * tinydrm_memcpy - Copy clip buffer - * @dst: Destination buffer - * @vaddr: Source buffer - * @fb: DRM framebuffer - * @clip: Clip rectangle area to copy - */ -void tinydrm_memcpy(void *dst, void *vaddr, struct drm_framebuffer *fb, - struct drm_rect *clip) -{ - unsigned int cpp = drm_format_plane_cpp(fb->format->format, 0); - unsigned int pitch = fb->pitches[0]; - void *src = vaddr + (clip->y1 * pitch) + (clip->x1 * cpp); - size_t len = (clip->x2 - clip->x1) * cpp; - unsigned int y; - - for (y = clip->y1; y < clip->y2; y++) { - memcpy(dst, src, len); - src += pitch; - dst += len; - } -} -EXPORT_SYMBOL(tinydrm_memcpy); - -/** - * tinydrm_swab16 - Swap bytes into clip buffer - * @dst: RGB565 destination buffer - * @vaddr: RGB565 source buffer - * @fb: DRM framebuffer - * @clip: Clip rectangle area to copy - */ -void tinydrm_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb, - struct drm_rect *clip) -{ - size_t len = (clip->x2 - clip->x1) * sizeof(u16); - unsigned int x, y; - u16 *src, *buf; - - /* - * 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; - - for (y = clip->y1; y < clip->y2; y++) { - src = vaddr + (y * fb->pitches[0]); - src += clip->x1; - memcpy(buf, src, len); - src = buf; - for (x = clip->x1; x < clip->x2; x++) - *dst++ = swab16(*src++); - } - - kfree(buf); -} -EXPORT_SYMBOL(tinydrm_swab16); - -/** - * tinydrm_xrgb8888_to_rgb565 - Convert XRGB8888 to RGB565 clip buffer - * @dst: RGB565 destination buffer - * @vaddr: XRGB8888 source buffer - * @fb: DRM framebuffer - * @clip: Clip rectangle area to copy - * @swap: Swap bytes - * - * Drivers can use this function for RGB565 devices that don't natively - * support XRGB8888. - */ -void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr, - struct drm_framebuffer *fb, - struct drm_rect *clip, bool swap) -{ - size_t len = (clip->x2 - clip->x1) * sizeof(u32); - unsigned int x, y; - u32 *src, *buf; - u16 val16; - - buf = kmalloc(len, GFP_KERNEL); - if (!buf) - return; - - for (y = clip->y1; y < clip->y2; y++) { - src = vaddr + (y * fb->pitches[0]); - src += clip->x1; - memcpy(buf, src, len); - src = buf; - for (x = clip->x1; x < clip->x2; x++) { - val16 = ((*src & 0x00F80000) >> 8) | - ((*src & 0x0000FC00) >> 5) | - ((*src & 0x000000F8) >> 3); - src++; - if (swap) - *dst++ = swab16(val16); - else - *dst++ = val16; - } - } - - kfree(buf); -} -EXPORT_SYMBOL(tinydrm_xrgb8888_to_rgb565); - -/** - * tinydrm_xrgb8888_to_gray8 - Convert XRGB8888 to grayscale - * @dst: 8-bit grayscale destination buffer - * @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 tinydrm_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb, - struct drm_rect *clip) -{ - unsigned int len = (clip->x2 - clip->x1) * sizeof(u32); - unsigned int x, y; - void *buf; - u32 *src; - - if (WARN_ON(fb->format->format != DRM_FORMAT_XRGB8888)) - return; - /* - * 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; - - for (y = clip->y1; y < clip->y2; y++) { - src = vaddr + (y * fb->pitches[0]); - src += clip->x1; - memcpy(buf, src, len); - src = buf; - for (x = clip->x1; x < clip->x2; 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++; - } - } - - kfree(buf); -} -EXPORT_SYMBOL(tinydrm_xrgb8888_to_gray8); - #if IS_ENABLED(CONFIG_SPI) /** @@ -365,3 +203,5 @@ int tinydrm_spi_transfer(struct spi_device *spi, u32 speed_hz, EXPORT_SYMBOL(tinydrm_spi_transfer); #endif /* CONFIG_SPI */ + +MODULE_LICENSE("GPL"); |