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dmarc=none (p=none dis=none) header.from=bootlin.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender:Content-Type:Cc: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: In-Reply-To:MIME-Version:References:Message-ID:Subject:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=MUTOXYaH1Xlxwg5/rAijjcVk+gEGOEn7r2HULJkoEKs=; b=LEa9iKovYsKY2GBcoT4mij46c VwxJmA9OjH9nsjreWh5gSTVGVy2+ak1SkFbJHh44l2uXjxjCW9Eg8LMlJ5fKlhSTCaKoMYkKhFlkF AnmkVB/OcCN0nOt0uOkv4BabaNxkPJlmDmmeWKPPQGNzDq2S4xr33pdSZeHfB9a4zGe2jWRe49FJG h64yiqwABXvCozJPh77Ydt076XOe+8FgD4vTUmnzQA8slEGZ9elCeyCrQ5B3Z5yDDC89lKWBY1gGy VWv6vjRqcY6ePOXxkeezYlgOMeUfLZ/VmD9QaPSJCU5j3+b9dl6eubS46ZtkVHdWvt4AWKvbO9YAB BvwULBxCw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iMtSd-0008Ka-2v; Tue, 22 Oct 2019 12:40:27 +0000 Received: from relay4-d.mail.gandi.net ([217.70.183.196]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iMtSZ-0008JS-JK for linux-arm-kernel@lists.infradead.org; Tue, 22 Oct 2019 12:40:25 +0000 X-Originating-IP: 86.250.200.211 Received: from aptenodytes (lfbn-1-17395-211.w86-250.abo.wanadoo.fr [86.250.200.211]) (Authenticated sender: paul.kocialkowski@bootlin.com) by relay4-d.mail.gandi.net (Postfix) with ESMTPSA id 1D666E0005; Tue, 22 Oct 2019 12:40:13 +0000 (UTC) Date: Tue, 22 Oct 2019 14:40:12 +0200 From: Paul Kocialkowski To: Mauro Carvalho Chehab Subject: Re: [PATCH v8 3/3] media: cedrus: Add HEVC/H.265 decoding support Message-ID: <20191022124012.GD2651@aptenodytes> References: <20190927143411.141526-1-paul.kocialkowski@bootlin.com> <20190927143411.141526-4-paul.kocialkowski@bootlin.com> <20191017095751.5a229051@coco.lan> MIME-Version: 1.0 In-Reply-To: <20191017095751.5a229051@coco.lan> User-Agent: Mutt/1.12.2 (2019-09-21) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191022_054023_912670_44AD2148 X-CRM114-Status: GOOD ( 17.89 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Nicolas Dufresne , Jernej Skrabec , Jonas Karlman , Chen-Yu Tsai , Maxime Ripard , linux-kernel@vger.kernel.org, Hans Verkuil , linux-sunxi@googlegroups.com, Thomas Petazzoni , Tomasz Figa , Ezequiel Garcia , linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org Content-Type: multipart/mixed; boundary="===============5885614530206408582==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============5885614530206408582== Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="B4IIlcmfBL/1gGOG" Content-Disposition: inline --B4IIlcmfBL/1gGOG Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi Mauro and thanks for the review, On Thu 17 Oct 19, 09:57, Mauro Carvalho Chehab wrote: > Em Fri, 27 Sep 2019 16:34:11 +0200 > Paul Kocialkowski escreveu: >=20 > > This introduces support for HEVC/H.265 to the Cedrus VPU driver, with > > both uni-directional and bi-directional prediction modes supported. > >=20 > > Field-coded (interlaced) pictures, custom quantization matrices and > > 10-bit output are not supported at this point. > >=20 > > Signed-off-by: Paul Kocialkowski > > --- >=20 > ... >=20 > > + unsigned int ctb_size_luma =3D > > + 1 << log2_max_luma_coding_block_size; >=20 > Shifts like this is a little scary. "1" constant is signed. So, if > log2_max_luma_coding_block_size is 31, the above logic has undefined > behavior. Different archs and C compilers may handle it on different > ways. I wasn't aware that it was the case, thanks for bringing this to light! I'll make it 1UL then. > > +#define VE_DEC_H265_LOW_ADDR_PRIMARY_CHROMA(a) \ > > + (((a) << 24) & GENMASK(31, 24)) >=20 > Same applies here and on other similar macros. You need to enforce > (a) to be unsigned, as otherwise the behavior is undefined. >=20 > Btw, this is a recurrent pattern on this file. I would define a > macro, e. g. something like: >=20 > #define MASK_BITS_AND_SHIFT(v, high, low) \ > ((UL(v) << low) & GENMASK(high, low)) >=20 > And use it for all similar patterns here. Sounds good! I find that the reverse wording (SHIFT_AND_MASK_BITS) would be a bit more explicit since the shift happens prior to the mask. Also we probably need to have parenthesis around "low", right? > The best would be to include such macro at linux/bits.h, although some > upstream discussion is required. >=20 > So, for now, let's add it at this header file, but work upstream > to have it merged there. Understood, I'll include it in that header for now and send a separate patch for inclusion in linux/bits.h (apparently the preprocessor doesn't care abo= ut redefinitions so we can just remove the cedrus fashion once the common one = is in). What do you think? Cheers, Paul --B4IIlcmfBL/1gGOG Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQEzBAEBCAAdFiEEJZpWjZeIetVBefti3cLmz3+fv9EFAl2u+KwACgkQ3cLmz3+f v9Gz+wf/Zm7r1AZpv5lPzfcsaQXWOZk4HXntSACtkvGv3E/mgOtN8S/SrT59MQ6V MPfJ2aBH5JhDiv6NIW1vFwhvx8gJ8P8Dshl2I8I/qzAzoqLGjBQe3Hod/tpq0ZFe tqiIhujaADacV9qCeOl4aBWfcVDdIznZZ8RilXQT/Bl98912LWpEmy8rMmNEVxGe JM+mnw7gDZfuRHDmAR/IXAMYcN1mF9m8t49liAvEWSesEUKTPuTkejZAffiUAY4o FAvYoNMOrX9+l1j+tRgdDSO9Kg8XuF6rh0ATqaiOnu2sg+AcDPBXozHa8KuJX9dl 8tN1aQb0gn+lwL9XRnCNEvjHzYFveA== =ev27 -----END PGP SIGNATURE----- --B4IIlcmfBL/1gGOG-- --===============5885614530206408582== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel --===============5885614530206408582==--