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Message-ID: <0972c604-36f8-ed60-bea8-2ed82f79645a@tronnes.org>
Date: Wed, 9 Aug 2017 17:56:53 +0200
From: Noralf Trønnes <noralf@...nnes.org>
To: David Lechner <david@...hnology.com>,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc: Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Sekhar Nori <nsekhar@...com>,
Kevin Hilman <khilman@...nel.org>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/5] drm/tinydrm: Generalize
tinydrm_xrgb8888_to_gray8()
Den 07.08.2017 19.39, skrev David Lechner:
> 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@...hnology.com>
> ---
Thanks for doing this, applied to drm-misc.
Noralf.
> 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);
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