From mboxrd@z Thu Jan 1 00:00:00 1970 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 6F11A3358DE; Thu, 20 Nov 2025 12:32:48 +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=1763641973; cv=none; b=FeXgGnG1T0+ftEglKH9evqAKptY1TWC+85PvCYVTFeyeLEOURseviOZg7PRw8t/GxSWjouWrhkHk4Ajq8jsr0xwDPqWOs4NlYwkhrEu+UUw3OlTrWLZiVhrsv7jDn1x0OAVKcjulmubbJYm5qyXDu0JCBPSmyKY7zVSdY7a5rk0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1763641973; c=relaxed/simple; bh=2v+oVXA5XQwW3yaP6RdhHsbJCehfOR8b/dPGpGw+7W8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=lb1wnrHOEIm6qUEveeeu4+NwB4+HstgCmSsQSAV7yteR/51omwhCOHOcQyQ0xHHsbt9lhpveN9wFYnfB+H7B+87OI0Ha3Ajy7FmRlK6SRU3dOF3k8gDAyG+V2vrlOed0ojgyFBsZLgBDdJ41HmtME00aS1qB/wd1gSUtjAwQXCU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=iQvExGL9; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (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="iQvExGL9" Received: from [192.168.88.20] (91-158-153-178.elisa-laajakaista.fi [91.158.153.178]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 30346B5; Thu, 20 Nov 2025 13:30:38 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1763641839; bh=2v+oVXA5XQwW3yaP6RdhHsbJCehfOR8b/dPGpGw+7W8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=iQvExGL9odqgZlLHny2/T87i5wcR1GavlcQaEhBcuhsovMyq81+sfccISi+tg4H6w YNhaQlg9rXgEZNVjZhh+g69+lF7fmOim15+qmuEnA5Jp2x/pGMdtX8S+3TF4Pt5LSt WHBcls/zcCjap+cwDEXYpmsRwfh87/no7RX4smWk= Message-ID: <442f321e-be2e-4a42-ba3e-d8a58eaac11b@ideasonboard.com> Date: Thu, 20 Nov 2025 14:32:40 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 11/18] media: ti: j721e-csi2rx: add support for processing virtual channels To: Rishikesh Donadkar , jai.luthra@linux.dev, laurent.pinchart@ideasonboard.com, mripard@kernel.org Cc: y-abhilashchandra@ti.com, devarsht@ti.com, s-jain1@ti.com, vigneshr@ti.com, mchehab@kernel.org, robh@kernel.org, krzk+dt@kernel.org, p.zabel@pengutronix.de, conor+dt@kernel.org, sakari.ailus@linux.intel.com, hverkuil-cisco@xs4all.nl, jai.luthra@ideasonboard.com, changhuang.liang@starfivetech.com, jack.zhu@starfivetech.com, sjoerd@collabora.com, dan.carpenter@linaro.org, hverkuil+cisco@kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org References: <20251112115459.2479225-1-r-donadkar@ti.com> <20251112115459.2479225-12-r-donadkar@ti.com> From: Tomi Valkeinen Content-Language: en-US Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hi, On 12/11/2025 13:54, Rishikesh Donadkar wrote: > From: Jai Luthra > > Use get_frame_desc() to get the frame desc from the connected source, > and use the provided virtual channel instead of hardcoded one. So this baffled me a bit: the code seems to get the VC from the frame desc, but not the DT. But it looks like the DT values are hardcoded in the driver's formats table, and those are used for DT filtering. We need to do something like that for legacy cases where the source does not support get_frame_desc, but if there is a frame desc, we should use the DT and VC from the frame desc. > get_frame_desc() returns the same information when called on each stream > start, so instead get the VCs for all the routed stream at first > stream start and cache this information in the driver. I get the point but... There isn't anything like this in the patch? > get_frame_desc() works per stream, but as we don't support multiple "get_frame_desc() works per stream", what does it mean? It returns all the streams for a pad. > streams yet, we will just always use stream 0. If the source doesn't > support get_frame_desc(), fall back to the previous method of always > capturing virtual channel 0. Right, if there's no frame desc (and we need to support legacy drivers), the driver should default to VC=0, DT from the formats table. But as mentioned above, VC and DT should normally come from the frame desc. It would be good to have a separate "legacy" function/branch/something, so that we clearly distinguish the legacy and frame-desc cases. Tomi > Reviewed-by: Yemike Abhilash Chandra > Co-developed-by: Pratyush Yadav > Signed-off-by: Pratyush Yadav > Signed-off-by: Jai Luthra > Signed-off-by: Rishikesh Donadkar > --- > .../platform/ti/j721e-csi2rx/j721e-csi2rx.c | 38 +++++++++++++++++++ > 1 file changed, 38 insertions(+) > > diff --git a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c > index 5c4524bf42e6e..126a62fa2c4c4 100644 > --- a/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c > +++ b/drivers/media/platform/ti/j721e-csi2rx/j721e-csi2rx.c > @@ -32,6 +32,7 @@ > #define SHIM_DMACNTX_YUV422 GENMASK(27, 26) > #define SHIM_DMACNTX_DUAL_PCK_CFG BIT(24) > #define SHIM_DMACNTX_SIZE GENMASK(21, 20) > +#define SHIM_DMACNTX_VC GENMASK(9, 6) > #define SHIM_DMACNTX_FMT GENMASK(5, 0) > #define SHIM_DMACNTX_YUV422_MODE_11 3 > #define SHIM_DMACNTX_SIZE_8 0 > @@ -110,6 +111,8 @@ struct ti_csi2rx_ctx { > struct media_pad pad; > u32 sequence; > u32 idx; > + u32 vc; > + u32 stream; > }; > > struct ti_csi2rx_dev { > @@ -610,6 +613,7 @@ static void ti_csi2rx_setup_shim(struct ti_csi2rx_ctx *ctx) > } > > reg |= FIELD_PREP(SHIM_DMACNTX_SIZE, fmt->size); > + reg |= FIELD_PREP(SHIM_DMACNTX_VC, ctx->vc); > > writel(reg, csi->shim + SHIM_DMACNTX(ctx->idx)); > > @@ -884,6 +888,32 @@ static void ti_csi2rx_buffer_queue(struct vb2_buffer *vb) > } > } > > +static int ti_csi2rx_get_vc(struct ti_csi2rx_ctx *ctx) > +{ > + struct ti_csi2rx_dev *csi = ctx->csi; > + struct v4l2_mbus_frame_desc fd; > + struct media_pad *pad; > + int ret, i; > + > + pad = media_entity_remote_pad_unique(&csi->subdev.entity, MEDIA_PAD_FL_SOURCE); > + if (!pad) > + return -ENODEV; > + > + ret = v4l2_subdev_call(csi->source, pad, get_frame_desc, pad->index, &fd); > + if (ret) > + return ret; > + > + if (fd.type != V4L2_MBUS_FRAME_DESC_TYPE_CSI2) > + return -EINVAL; > + > + for (i = 0; i < fd.num_entries; i++) { > + if (ctx->stream == fd.entry[i].stream) > + return fd.entry[i].bus.csi2.vc; > + } > + > + return -ENODEV; > +} > + > static int ti_csi2rx_start_streaming(struct vb2_queue *vq, unsigned int count) > { > struct ti_csi2rx_ctx *ctx = vb2_get_drv_priv(vq); > @@ -904,6 +934,14 @@ static int ti_csi2rx_start_streaming(struct vb2_queue *vq, unsigned int count) > if (ret) > goto err; > > + ret = ti_csi2rx_get_vc(ctx); > + if (ret == -ENOIOCTLCMD) > + ctx->vc = 0; > + else if (ret < 0) > + goto err; > + else > + ctx->vc = ret; > + > ti_csi2rx_setup_shim(ctx); > > ctx->sequence = 0;