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Fri, 22 Nov 2024 00:42:07 -0800 (PST) Received: from raspberrypi.com ([93.93.133.154]) by smtp-relay.gmail.com with ESMTPS id 2adb3069b0e04-53dd243bb76sm31151e87.11.2024.11.22.00.42.06 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 Nov 2024 00:42:07 -0800 (PST) X-Relaying-Domain: raspberrypi.com From: Naushir Patuck To: Raspberry Pi Kernel Maintenance , Mauro Carvalho Chehab , Florian Fainelli , Broadcom internal kernel review list , Ray Jui , Scott Branden Cc: linux-media@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, jacopo.mondi@ideasonboard.com, Dave Stevenson , Naushir Patuck Subject: [PATCH v1 5/5] drivers: media: bcm2835-unicam: Correctly handle FS + FE ISR condition Date: Fri, 22 Nov 2024 08:41:52 +0000 Message-Id: <20241122084152.1841419-6-naush@raspberrypi.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20241122084152.1841419-1-naush@raspberrypi.com> References: <20241122084152.1841419-1-naush@raspberrypi.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 This change aligns the FS/FE interrupt handling with the Raspberry Pi kernel downstream Unicam driver. If we get a simultaneous FS + FE interrupt for the same frame, it cannot be marked as completed and returned to userland as the framebuffer will be refilled by Unicam on the next sensor frame. Additionally, the timestamp will be set to 0 as the FS interrupt handling code will not have run yet. To avoid these problems, the frame is considered dropped in the FE handler, and will be returned to userland on the subsequent sensor frame. Signed-off-by: Naushir Patuck --- .../media/platform/broadcom/bcm2835-unicam.c | 39 +++++++++++++++++-- 1 file changed, 35 insertions(+), 4 deletions(-) diff --git a/drivers/media/platform/broadcom/bcm2835-unicam.c b/drivers/media/platform/broadcom/bcm2835-unicam.c index f10064107d54..0d2aa25d483f 100644 --- a/drivers/media/platform/broadcom/bcm2835-unicam.c +++ b/drivers/media/platform/broadcom/bcm2835-unicam.c @@ -773,10 +773,26 @@ static irqreturn_t unicam_isr(int irq, void *dev) * as complete, as the HW will reuse that buffer. */ if (node->cur_frm && node->cur_frm != node->next_frm) { + /* + * This condition checks if FE + FS for the same + * frame has occurred. In such cases, we cannot + * return out the frame, as no buffer handling + * or timestamping has yet been done as part of + * the FS handler. + */ + if (!node->cur_frm->vb.vb2_buf.timestamp) { + dev_dbg(unicam->v4l2_dev.dev, + "ISR: FE without FS, dropping frame\n"); + continue; + } + unicam_process_buffer_complete(node, sequence); + node->cur_frm = node->next_frm; + node->next_frm = NULL; inc_seq = true; + } else { + node->cur_frm = node->next_frm; } - node->cur_frm = node->next_frm; } /* @@ -812,10 +828,25 @@ static irqreturn_t unicam_isr(int irq, void *dev) i); /* * Set the next frame output to go to a dummy frame - * if we have not managed to obtain another frame - * from the queue. + * if no buffer currently queued. */ - unicam_schedule_dummy_buffer(node); + if (!node->next_frm || + node->next_frm == node->cur_frm) { + unicam_schedule_dummy_buffer(node); + } else if (unicam->node[i].cur_frm) { + /* + * Repeated FS without FE. Hardware will have + * swapped buffers, but the cur_frm doesn't + * contain valid data. Return cur_frm to the + * queue. + */ + spin_lock(&node->dma_queue_lock); + list_add_tail(&node->cur_frm->list, + &node->dma_queue); + spin_unlock(&node->dma_queue_lock); + node->cur_frm = node->next_frm; + node->next_frm = NULL; + } } unicam_queue_event_sof(unicam);