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69 lines
2.5 KiB
Diff
69 lines
2.5 KiB
Diff
From 4e7680cadd832d49c8ce52c67c459df1b3e7232c Mon Sep 17 00:00:00 2001
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From: Naushir Patuck <naush@raspberrypi.com>
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Date: Mon, 8 Aug 2022 10:01:41 +0100
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Subject: [PATCH 440/726] media: bcm2835-unicam: Correctly handle FS + FE ISR
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condtion
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If we get a simultaneous FS + FE interrupt for the same frame, it cannot be
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marked as completed and returned to userland as the framebuffer will be refilled
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by Unicam on the next sensor frame. Additionally, the timestamp will be set to 0
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as the FS interrupt handling code will not have run yet.
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To avoid these problems, the frame is considered dropped in the FE handler,
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and will be returned to userland on the subsequent sensor frame.
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Signed-off-by: Naushir Patuck <naush@raspberrypi.com>
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---
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.../media/platform/bcm2835/bcm2835-unicam.c | 28 +++++++++++++------
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1 file changed, 20 insertions(+), 8 deletions(-)
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diff --git a/drivers/media/platform/bcm2835/bcm2835-unicam.c b/drivers/media/platform/bcm2835/bcm2835-unicam.c
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index 7b7de978a214..2fd96081cda6 100644
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--- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
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+++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
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@@ -919,7 +919,9 @@ static irqreturn_t unicam_isr(int irq, void *dev)
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* to use.
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*/
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for (i = 0; i < ARRAY_SIZE(unicam->node); i++) {
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- if (!unicam->node[i].streaming)
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+ struct unicam_node *node = &unicam->node[i];
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+
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+ if (!node->streaming)
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continue;
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/*
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@@ -929,14 +931,24 @@ static irqreturn_t unicam_isr(int irq, void *dev)
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* + FS + LS). In this case, we cannot signal the buffer
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* as complete, as the HW will reuse that buffer.
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*/
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- if (unicam->node[i].cur_frm &&
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- unicam->node[i].cur_frm != unicam->node[i].next_frm) {
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- unicam_process_buffer_complete(&unicam->node[i],
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- sequence);
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- unicam->node[i].cur_frm = unicam->node[i].next_frm;
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- unicam->node[i].next_frm = NULL;
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+ if (node->cur_frm && node->cur_frm != node->next_frm) {
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+ /*
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+ * This condition checks if FE + FS for the same
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+ * frame has occurred. In such cases, we cannot
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+ * return out the frame, as no buffer handling
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+ * or timestamping has yet been done as part of
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+ * the FS handler.
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+ */
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+ if (!node->cur_frm->vb.vb2_buf.timestamp) {
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+ unicam_dbg(2, unicam, "ISR: FE without FS, dropping frame\n");
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+ continue;
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+ }
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+
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+ unicam_process_buffer_complete(node, sequence);
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+ node->cur_frm = node->next_frm;
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+ node->next_frm = NULL;
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} else {
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- unicam->node[i].cur_frm = unicam->node[i].next_frm;
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+ node->cur_frm = node->next_frm;
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}
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}
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unicam->sequence++;
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--
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2.33.1
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