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Subject[PATCH v4 1/5] drm/tinydrm: Generalize tinydrm_xrgb8888_to_gray8()
Date
This adds parameters for vaddr and clip to tinydrm_xrgb8888_to_gray8() to
make it more generic.

dma_buf_{begin,end}_cpu_access() are moved out to the repaper driver.

Return type is change to void to simplify error handling by callers.

Signed-off-by: David Lechner <david@lechnology.com>
---

v4 changes:
* Change return type to void.


drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c | 42 +++++++++-----------------
drivers/gpu/drm/tinydrm/repaper.c | 28 +++++++++++++++--
include/drm/tinydrm/tinydrm-helpers.h | 3 +-
3 files changed, 41 insertions(+), 32 deletions(-)

diff --git a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
index 75808bb..bd6cce0 100644
--- a/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
+++ b/drivers/gpu/drm/tinydrm/core/tinydrm-helpers.c
@@ -185,7 +185,9 @@ 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
@@ -195,41 +197,31 @@ EXPORT_SYMBOL(tinydrm_xrgb8888_to_rgb565);
* where 1 means foreground color and 0 background color.
*
* ITU BT.601 is used for the RGB -> luma (brightness) conversion.
- *
- * Returns:
- * Zero on success, negative error code on failure.
*/
-int tinydrm_xrgb8888_to_gray8(u8 *dst, struct drm_framebuffer *fb)
+void tinydrm_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip)
{
- struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
- struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
- unsigned int x, y, pitch = fb->pitches[0];
- int ret = 0;
+ 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 -EINVAL;
+ return;
/*
* The cma memory is write-combined so reads are uncached.
* Speed up by fetching one line at a time.
*/
- buf = kmalloc(pitch, GFP_KERNEL);
+ buf = kmalloc(len, GFP_KERNEL);
if (!buf)
- return -ENOMEM;
-
- if (import_attach) {
- ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
- DMA_FROM_DEVICE);
- if (ret)
- goto err_free;
- }
+ return;

- for (y = 0; y < fb->height; y++) {
- src = cma_obj->vaddr + (y * pitch);
- memcpy(buf, src, pitch);
+ 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 = 0; x < fb->width; x++) {
+ for (x = clip->x1; x < clip->x2; x++) {
u8 r = (*src & 0x00ff0000) >> 16;
u8 g = (*src & 0x0000ff00) >> 8;
u8 b = *src & 0x000000ff;
@@ -240,13 +232,7 @@ int tinydrm_xrgb8888_to_gray8(u8 *dst, struct drm_framebuffer *fb)
}
}

- if (import_attach)
- ret = dma_buf_end_cpu_access(import_attach->dmabuf,
- DMA_FROM_DEVICE);
-err_free:
kfree(buf);
-
- return ret;
}
EXPORT_SYMBOL(tinydrm_xrgb8888_to_gray8);

diff --git a/drivers/gpu/drm/tinydrm/repaper.c b/drivers/gpu/drm/tinydrm/repaper.c
index 3343d3f..30dc97b 100644
--- a/drivers/gpu/drm/tinydrm/repaper.c
+++ b/drivers/gpu/drm/tinydrm/repaper.c
@@ -18,6 +18,7 @@
*/

#include <linux/delay.h>
+#include <linux/dma-buf.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of_device.h>
@@ -525,11 +526,20 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb,
struct drm_clip_rect *clips,
unsigned int num_clips)
{
+ struct drm_gem_cma_object *cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+ struct dma_buf_attachment *import_attach = cma_obj->base.import_attach;
struct tinydrm_device *tdev = fb->dev->dev_private;
struct repaper_epd *epd = epd_from_tinydrm(tdev);
+ struct drm_clip_rect clip;
u8 *buf = NULL;
int ret = 0;

+ /* repaper can't do partial updates */
+ clip.x1 = 0;
+ clip.x2 = fb->width;
+ clip.y1 = 0;
+ clip.y2 = fb->height;
+
mutex_lock(&tdev->dirty_lock);

if (!epd->enabled)
@@ -550,9 +560,21 @@ static int repaper_fb_dirty(struct drm_framebuffer *fb,
goto out_unlock;
}

- ret = tinydrm_xrgb8888_to_gray8(buf, fb);
- if (ret)
- goto out_unlock;
+ if (import_attach) {
+ ret = dma_buf_begin_cpu_access(import_attach->dmabuf,
+ DMA_FROM_DEVICE);
+ if (ret)
+ goto out_unlock;
+ }
+
+ tinydrm_xrgb8888_to_gray8(buf, cma_obj->vaddr, fb, &clip);
+
+ if (import_attach) {
+ ret = dma_buf_end_cpu_access(import_attach->dmabuf,
+ DMA_FROM_DEVICE);
+ if (ret)
+ goto out_unlock;
+ }

repaper_gray8_to_mono_reversed(buf, fb->width, fb->height);

diff --git a/include/drm/tinydrm/tinydrm-helpers.h b/include/drm/tinydrm/tinydrm-helpers.h
index a6c387f..d554ded 100644
--- a/include/drm/tinydrm/tinydrm-helpers.h
+++ b/include/drm/tinydrm/tinydrm-helpers.h
@@ -43,7 +43,8 @@ void tinydrm_swab16(u16 *dst, void *vaddr, struct drm_framebuffer *fb,
void tinydrm_xrgb8888_to_rgb565(u16 *dst, void *vaddr,
struct drm_framebuffer *fb,
struct drm_clip_rect *clip, bool swap);
-int tinydrm_xrgb8888_to_gray8(u8 *dst, struct drm_framebuffer *fb);
+void tinydrm_xrgb8888_to_gray8(u8 *dst, void *vaddr, struct drm_framebuffer *fb,
+ struct drm_clip_rect *clip);

struct backlight_device *tinydrm_of_find_backlight(struct device *dev);
int tinydrm_enable_backlight(struct backlight_device *backlight);
--
2.7.4
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