From patchwork Thu Nov 28 14:51:43 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Isaac Scott X-Patchwork-Id: 13888097 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 65ED725761 for ; Thu, 28 Nov 2024 14:51:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732805519; cv=none; b=Jm9N1c31XbXCAcnwVIXO6gpd1+nm5jW58cLzjiWNflNVySABYkKePRgUfoXA3Pt2NxrPkypJZH7CPCFhclikzbYrNZvpUZ6IYx2nwaIwGt9n5HUEyRVpEvbcNAHROksaEs/WOYnpklk2UQdGq0d/h8fdJ+9pfAlIwgAZgejN/IM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732805519; c=relaxed/simple; bh=ds8I9t+lul7skH+kL3SwaEMh0S5SE+8WSPxu5E8/3dw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=LpIWi8oh4TCGRewRcFzcsC2mXzKUXCtCV0qLb8BYfrnnJwtItms1uvPeaYj/ELbcbg8dtIIZMpfniS/uUiMGL/9TVBS72ka9uoDV7zhWf8Et+KOFdIDZAONK9+EcDuGek6/pEV9cbRI9XRjedP5FNzz6UUp8m2llQlrWHonXvQE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=ZaVeZwET; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="ZaVeZwET" Received: from isaac-ThinkPad-T16-Gen-2.lan (cpc89244-aztw30-2-0-cust6594.18-1.cable.virginm.net [86.31.185.195]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 61D04842; Thu, 28 Nov 2024 15:51:26 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1732805486; bh=ds8I9t+lul7skH+kL3SwaEMh0S5SE+8WSPxu5E8/3dw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZaVeZwET3IFDxXBmc+rFrCf1NN0hO64Dm0zNao/Cx4SICXgpsO3wlPj6Ao4Jhhs1a CfQYxb0LSPfJH4xGWaJ1zFs32S5awzqT/pAXSHWfeCC6enS6CgGHA0BuQt2PqTUWJT 1Fxljg3u1ObSdfxrjz/PJ39gP9OPuOogYHXEoPoE= From: Isaac Scott To: laurent.pinchart@ideasonboard.com Cc: mchehab@kernel.org, linux-media@vger.kernel.org, Isaac Scott Subject: [PATCH v8 1/2] media: uvcvideo: Implement dual stream quirk to fix loss of usb packets Date: Thu, 28 Nov 2024 14:51:43 +0000 Message-ID: <20241128145144.61475-2-isaac.scott@ideasonboard.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20241128145144.61475-1-isaac.scott@ideasonboard.com> References: <20241128145144.61475-1-isaac.scott@ideasonboard.com> Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Some cameras, such as the Sonix Technology Co. 292A, exhibit issues when running two parallel streams, causing USB packets to be dropped when an H.264 stream posts a keyframe while an MJPEG stream is running simultaneously. This occasionally causes the driver to erroneously output two consecutive JPEG images as a single frame. To fix this, we inspect the buffer, and trigger a new frame when we find an SOI. Signed-off-by: Isaac Scott --- drivers/media/usb/uvc/uvc_video.c | 27 ++++++++++++++++++++++++++- drivers/media/usb/uvc/uvcvideo.h | 1 + 2 files changed, 27 insertions(+), 1 deletion(-) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index e00f38dd07d9..6d800a099749 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -20,6 +20,7 @@ #include #include +#include #include #include "uvcvideo.h" @@ -1116,6 +1117,7 @@ static void uvc_video_stats_stop(struct uvc_streaming *stream) static int uvc_video_decode_start(struct uvc_streaming *stream, struct uvc_buffer *buf, const u8 *data, int len) { + u8 header_len; u8 fid; /* @@ -1129,6 +1131,7 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, return -EINVAL; } + header_len = data[0]; fid = data[1] & UVC_STREAM_FID; /* @@ -1210,9 +1213,31 @@ static int uvc_video_decode_start(struct uvc_streaming *stream, return -EAGAIN; } + /* + * Some cameras, when running two parallel streams (one MJPEG alongside + * another non-MJPEG stream), are known to lose the EOF packet for a frame. + * We can detect the end of a frame by checking for a new SOI marker, as + * the SOI always lies on the packet boundary between two frames for + * these devices. + */ + if (stream->dev->quirks & UVC_QUIRK_MJPEG_NO_EOF && + (stream->cur_format->fcc == V4L2_PIX_FMT_MJPEG || + stream->cur_format->fcc == V4L2_PIX_FMT_JPEG)) { + const u8 *packet = data + header_len; + + if (len >= header_len + 2 && + packet[0] == 0xff && packet[1] == JPEG_MARKER_SOI && + buf->bytesused != 0) { + buf->state = UVC_BUF_STATE_READY; + buf->error = 1; + stream->last_fid ^= UVC_STREAM_FID; + return -EAGAIN; + } + } + stream->last_fid = fid; - return data[0]; + return header_len; } static inline enum dma_data_direction uvc_stream_dir( diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index b7d24a853ce4..040073326a24 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -76,6 +76,7 @@ #define UVC_QUIRK_NO_RESET_RESUME 0x00004000 #define UVC_QUIRK_DISABLE_AUTOSUSPEND 0x00008000 #define UVC_QUIRK_INVALID_DEVICE_SOF 0x00010000 +#define UVC_QUIRK_MJPEG_NO_EOF 0x00020000 /* Format flags */ #define UVC_FMT_FLAG_COMPRESSED 0x00000001