From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id E3FCDC4453A for ; Wed, 22 Jul 2026 10:00:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Type: Content-Transfer-Encoding:MIME-Version:References:In-Reply-To:Message-ID:Date :Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=sWDWsM9TBRItqToA/efliUD8bssiJSLzstCW4+0QWoE=; b=NGYhVQa7rRWBgdzNoooHDzhkm2 SibzXAWjQgKWFhbTJhI3F8wt6wVvsLUb2gl+kKQnjrMK1sNGkuTNWu1KBXS8QO8XJSf9QeSlA3YUb hEd9MlCqS4dD9/uL2cwsbztYCK1CJ5QUh1GuZ11LSNVPUJ5ZPViG+VzT4rBwAJMBy60c3SLo+LUPW sG9lWUOiOexKOxh/xRynjjRRNDK3CdHBUJf5VHqTDFYiGdCsie7fW5Ew854VpZ6TlH3AoGrf3u5o2 L/RGzA3p4kiu8FEX4fExbhmNPs2worvbNCmhFjagPKaLbXT4u7lEvfjIjc907hKHczgOUWcFIvyCE j44vf2aQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wmTkc-0000000BTxJ-31nz; Wed, 22 Jul 2026 10:00:30 +0000 Received: from gloria.sntech.de ([185.11.138.130]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wmTkY-0000000BTwG-2017; Wed, 22 Jul 2026 10:00:28 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sntech.de; s=gloria202408; h=Content-Type:Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From:Reply-To; bh=sWDWsM9TBRItqToA/efliUD8bssiJSLzstCW4+0QWoE=; b=AwgZpszx5epBC4Iy5r0MfWV7nm NqsefgU0PQJF7xw8wCPw9mDwW1avyoqiCPDSl6Byd4DUNYl7/auQYEpedEmoTNniJ4vIcqfbzfW29 Lzc0U9RmTHeJMvLoxb8mwDTiPo/rB0aTGIJNYUn6rENStzqvpNln1B2NHIkaWZ2ahkiZWlxIKv8FQ cuoa2tlp+gFkdkBakUUi83prtZEI5g6vFAKypdM4XkE4/urMmDKIGrZ9RcG+cU+Ri78pFlzb7znC7 Mu5ZiDTPI9jepe3KCqBwVSIPvuZhee94BeM2P9byVXTXOd5HJPMmJcqDAFL/5qMMo+zq24XI+OAsE ah9a+nPQ==; From: Heiko =?UTF-8?B?U3TDvGJuZXI=?= To: mchehab@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, nicolas.dufresne@collabora.com, Jiaxing Hu Cc: ezequiel@vanguardiasur.com.ar, linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Jiaxing Hu Subject: Re: [RFC PATCH 2/3] media: rockchip: add VEPU510 H.264 encoder driver for RK3576 Date: Wed, 22 Jul 2026 12:00:16 +0200 Message-ID: <3096814.BaHzMo0RvP@diego> In-Reply-To: <20260722073417.2064667-3-gahing@gahingwoo.com> References: <20260722073417.2064667-1-gahing@gahingwoo.com> <20260722073417.2064667-3-gahing@gahingwoo.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260722_030026_571984_B1005006 X-CRM114-Status: GOOD ( 20.57 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Am Mittwoch, 22. Juli 2026, 09:34:16 Mitteleurop=C3=A4ische Sommerzeit schr= ieb Jiaxing Hu: > Add a from-scratch stateful V4L2 mem2mem driver for the Rockchip RK3576 > VEPU510 H.264 hardware video encoder (raw NV12 in, H.264 Annex-B out), > modelled on the verisilicon/hantro device_run()/codec_ops split rather > than the downstream MPP-service/task-queue model. >=20 > The two encoder cores (rkvenc0/rkvenc1) are exposed as two independent > V4L2 M2M device nodes, each driving one physical core standalone; the > downstream vendor CCU cross-core load-balancing is not implemented. >=20 > Register field semantics were worked out by trial-and-error against > Rockchip's own open-source userspace codec library (rockchip-linux/mpp) > and cross-checked against a real register-write trace of the downstream > vendor stack running the same encode. >=20 > Intra (I-frame) encoding is confirmed working on real hardware (Radxa > ROCK 4D): it produces valid H.264 that the reference decoders accept. > Inter (P-frame) encoding still hits a hardware-watchdog stall in the > reference-read datapath -- this is the main open question for this RFC; > see the cover letter for the full symptom analysis. >=20 > Signed-off-by: Jiaxing Hu [...] > diff --git a/drivers/media/platform/rockchip/rkvenc/rkvenc.c b/drivers/me= dia/platform/rockchip/rkvenc/rkvenc.c > new file mode 100644 > index 000000000..d70bcc5fb > --- /dev/null > +++ b/drivers/media/platform/rockchip/rkvenc/rkvenc.c > @@ -0,0 +1,892 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Rockchip VEPU510 (RK3576) hardware video encoder driver. > + * > + * Copyright (C) 2026 Jiaxing Hu > + * > + * Architecture notes (see also rkvenc-regs.h): > + * > + * - This is a *stateful* V4L2 mem2mem encoder (raw NV12 in on OUTPUT, > + * H.264 Annex-B out on CAPTURE) modelled on > + * drivers/media/platform/verisilicon's hantro_drv.c device_run()/ > + * codec_ops{run,done} split, NOT on rkvdec's stateless request-API > + * decoder pattern =E2=80=94 an encoder has no per-frame bitstream to= parse, > + * so there is nothing analogous to rkvdec_run_preamble/postamble her= e. > + * > + * - The vendor downstream driver (rockchip-linux/kernel, > + * drivers/video/rockchip/mpp/mpp_rkvenc2.c) groups rkvenc0/rkvenc1 > + * under a "CCU" (rockchip,rkv-encoder-rk3576-ccu) that does pure > + * software task-queue load balancing across both cores, plus an > + * optional DCHS (dual-core-handshake) register protocol used only > + * when *deliberately* splitting one frame's rows across both cores. > + * There is no hardware descriptor/link-list engine behind it (unlike > + * the decoder's CCU). v1 of this driver does not implement either: > + * rkvenc0 and rkvenc1 are exposed as two independent V4L2 M2M device > + * nodes, each driving one physical core standalone =E2=80=94 the same > + * simplification rkvdec itself makes for multi-core VDPU hardware > + * (see rkvdec_disable_multicore()). At least the comment and from a casual look also the code get this backwards. The idea is to explicitly _not_ expose multiple video devices. See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/dri= vers/media/platform/rockchip/rkvdec/rkvdec.c#n1613 Any (future) scheduling should happen inside the driver, and not get offloaded onto _every_ userspace application individually. Heiko From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A25EAC44539 for ; Wed, 22 Jul 2026 10:00:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=NobKfLXzc/q6lz04/dPgrufYRslQgjgGs6+Vg156DB0=; b=1PCjtyvzeo8CTc 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b=AwgZpszx5epBC4Iy5r0MfWV7nm NqsefgU0PQJF7xw8wCPw9mDwW1avyoqiCPDSl6Byd4DUNYl7/auQYEpedEmoTNniJ4vIcqfbzfW29 Lzc0U9RmTHeJMvLoxb8mwDTiPo/rB0aTGIJNYUn6rENStzqvpNln1B2NHIkaWZ2ahkiZWlxIKv8FQ cuoa2tlp+gFkdkBakUUi83prtZEI5g6vFAKypdM4XkE4/urMmDKIGrZ9RcG+cU+Ri78pFlzb7znC7 Mu5ZiDTPI9jepe3KCqBwVSIPvuZhee94BeM2P9byVXTXOd5HJPMmJcqDAFL/5qMMo+zq24XI+OAsE ah9a+nPQ==; From: Heiko =?UTF-8?B?U3TDvGJuZXI=?= To: mchehab@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, nicolas.dufresne@collabora.com, Jiaxing Hu Cc: ezequiel@vanguardiasur.com.ar, linux-media@vger.kernel.org, devicetree@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Jiaxing Hu Subject: Re: [RFC PATCH 2/3] media: rockchip: add VEPU510 H.264 encoder driver for RK3576 Date: Wed, 22 Jul 2026 12:00:16 +0200 Message-ID: <3096814.BaHzMo0RvP@diego> In-Reply-To: <20260722073417.2064667-3-gahing@gahingwoo.com> References: <20260722073417.2064667-1-gahing@gahingwoo.com> <20260722073417.2064667-3-gahing@gahingwoo.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260722_030026_571984_B1005006 X-CRM114-Status: GOOD ( 20.57 ) X-BeenThere: linux-rockchip@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Upstream kernel work for Rockchip platforms List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org QW0gTWl0dHdvY2gsIDIyLiBKdWxpIDIwMjYsIDA5OjM0OjE2IE1pdHRlbGV1cm9ww6Rpc2NoZSBT b21tZXJ6ZWl0IHNjaHJpZWIgSmlheGluZyBIdToKPiBBZGQgYSBmcm9tLXNjcmF0Y2ggc3RhdGVm dWwgVjRMMiBtZW0ybWVtIGRyaXZlciBmb3IgdGhlIFJvY2tjaGlwIFJLMzU3Ngo+IFZFUFU1MTAg SC4yNjQgaGFyZHdhcmUgdmlkZW8gZW5jb2RlciAocmF3IE5WMTIgaW4sIEguMjY0IEFubmV4LUIg 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