[PATCH v2 4/5] drm: Add and export function drm_gem_cma_sync_data
Paul Cercueil
paul at crapouillou.net
Thu Mar 11 12:33:31 UTC 2021
Le jeu. 11 mars 2021 à 12:28, Christoph Hellwig <hch at infradead.org> a
écrit :
> On Sun, Mar 07, 2021 at 08:28:34PM +0000, Paul Cercueil wrote:
>> + drm_atomic_for_each_plane_damage(&iter, &clip) {
>> + for (i = 0; i < finfo->num_planes; i++) {
>> + daddr = drm_fb_cma_get_gem_addr(state->fb, state, i);
>> +
>> + /* Ignore x1/x2 values, invalidate complete lines */
>> + offset = clip.y1 * state->fb->pitches[i];
>> +
>> + dma_sync_single_for_device(dev, daddr + offset,
>> + (clip.y2 - clip.y1) * state->fb->pitches[i],
>> + DMA_TO_DEVICE);
>
> Are these helpers only ever used to transfer data to the device and
> never from it? If so please clearly document that.
Yes. In the DRM world, are there cases where we transfer data from the
device? I assume these cases are handled by v4l2 instead.
-Paul
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