pxa_camera_check_link_miss(9)

✨ pxa_camera_check_link_miss(9) ✨

okay bestie, grab your iced coffee 🧊 because we're diving into the Kernel API Manual and this one is a lil' niche but lowkey iconic 💅

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🌸 NAME 🌸

pxa_camera_check_link_miss — check missed DMA linking 🎀

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🦋 SYNOPSIS 🦋

void pxa_camera_check_link_miss (struct pxa_camera_dev *pcdev ,
       dma_cookie_t last_submitted , dma_cookie_t last_issued );

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💖 ARGUMENTS 💖

• pcdev — the camera device ✨ like, the main character of this whole situation
• last_submitted — an opaque DMA cookie for last submitted 🍓 (yes bestie, "opaque" — we do not peek inside, we just pass it along)
• last_issued — an opaque DMA cookie for last issued 🫶

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🔥 DESCRIPTION 🔥

k so here's the tea ☕ — the DMA chaining is done with DMA running. Which means there's this tiny temporal window that remains, where a buffer is queued on the chain, while the chain is already stopped 😭

And what does that mean? The tailed buffer would never be transferred by DMA. literally never. 💀

So this function restarts the capture for this corner case, where:

• DADR == DADDR_STOP 👑
• a video buffer is queued on the pcdev->capture list 🎀

ngl, if you wanna go deeper, please check the "DMA hot chaining timeslice issue" in Documentation/driver-api/media/drivers/pxa_camera.rst — iykyk 📖✨

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🌈 CONTEXT 🌈

should only be called within the dma irq handler ⚠️ like, do not just call this from anywhere bestie, respect the vibe check 🙈

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⭐ SEE ALSO ⭐

Kernel file ./drivers/media/platform/intel/pxa_camera.c, enum pxa_mbus_packing(9), enum pxa_mbus_order(9), enum pxa_mbus_layout(9), struct pxa_mbus_pixelfmt(9), struct pxa_mbus_lookup(9), struct pxa_camera_format_xlate(9), pxa_init_dma_channel(9), pxa_dma_start_channels(9), pxa_camera_start_capture(9) 🦋💜

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and that's the whole page, bestie — no cap, we kept every single detail 🧚💫

sooo this lil' gem lives in ./drivers/media/platform/intel, dated October 2026, and it's literally the pxa_camera_check_link_miss(9) manual page from the Kernel API Manual 🎀 slay, go forth and check those link misses 💅👑