Messages in this thread | | | Date | Thu, 11 Mar 2021 12:33:31 +0000 | From | Paul Cercueil <> | Subject | Re: [PATCH v2 4/5] drm: Add and export function drm_gem_cma_sync_data |
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Le jeu. 11 mars 2021 à 12:28, Christoph Hellwig <hch@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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