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Tue, 19 May 2026 17:16:18 +0200 (CEST) Message-ID: Subject: Re: [PATCH 05/16] media: v4l2-common: Fix NV15_4L4 format info block height From: Nicolas Dufresne To: Paul Kocialkowski , linux-media@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev Cc: Mauro Carvalho Chehab , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Greg Kroah-Hartman , Arash Golgol , Laurent Pinchart Date: Tue, 19 May 2026 11:16:17 -0400 In-Reply-To: <20260518102451.417971-6-paulk@sys-base.io> References: <20260518102451.417971-1-paulk@sys-base.io> <20260518102451.417971-6-paulk@sys-base.io> Autocrypt: addr=nicolas.dufresne@collabora.com; prefer-encrypt=mutual; keydata=mDMEaCN2ixYJKwYBBAHaRw8BAQdAM0EHepTful3JOIzcPv6ekHOenE1u0vDG1gdHFrChD /e0J05pY29sYXMgRHVmcmVzbmUgPG5pY29sYXNAbmR1ZnJlc25lLmNhPoicBBMWCgBEAhsDBQsJCA cCAiICBhUKCQgLAgQWAgMBAh4HAheABQkJZfd1FiEE7w1SgRXEw8IaBG8S2UGUUSlgcvQFAmibrjo CGQEACgkQ2UGUUSlgcvQlQwD/RjpU1SZYcKG6pnfnQ8ivgtTkGDRUJ8gP3fK7+XUjRNIA/iXfhXMN abIWxO2oCXKf3TdD7aQ4070KO6zSxIcxgNQFtDFOaWNvbGFzIER1ZnJlc25lIDxuaWNvbGFzLmR1Z nJlc25lQGNvbGxhYm9yYS5jb20+iJkEExYKAEECGwMFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4 AWIQTvDVKBFcTDwhoEbxLZQZRRKWBy9AUCaCyyxgUJCWX3dQAKCRDZQZRRKWBy9ARJAP96pFmLffZ smBUpkyVBfFAf+zq6BJt769R0al3kHvUKdgD9G7KAHuioxD2v6SX7idpIazjzx8b8rfzwTWyOQWHC AAS0LU5pY29sYXMgRHVmcmVzbmUgPG5pY29sYXMuZHVmcmVzbmVAZ21haWwuY29tPoiZBBMWCgBBF iEE7w1SgRXEw8IaBG8S2UGUUSlgcvQFAmibrGYCGwMFCQll93UFCwkIBwICIgIGFQoJCAsCBBYCAw ECHgcCF4AACgkQ2UGUUSlgcvRObgD/YnQjfi4+L8f4fI7p1pPMTwRTcaRdy6aqkKEmKsCArzQBAK8 bRLv9QjuqsE6oQZra/RB4widZPvphs78H0P6NmpIJ Organization: Collabora Canada Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-GJ5iBdhdx0UoTc8uYpG1" User-Agent: Evolution 3.60.1 (3.60.1-1.fc44) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260519_081623_294432_DCA3AE05 X-CRM114-Status: GOOD ( 17.99 ) 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 --=-GJ5iBdhdx0UoTc8uYpG1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Le lundi 18 mai 2026 =C3=A0 12:24 +0200, Paul Kocialkowski a =C3=A9crit=C2= =A0: > The NV15_4L4 format is specified as a 4x4 format, not 4x1. > In addition the block size should not take subsampling in account, > so specify it as 4x4 for both luma and chroma. >=20 > Signed-off-by: Paul Kocialkowski > --- > =C2=A0drivers/media/v4l2-core/v4l2-common.c | 2 +- > =C2=A01 file changed, 1 insertion(+), 1 deletion(-) >=20 > diff --git a/drivers/media/v4l2-core/v4l2-common.c b/drivers/media/v4l2-c= ore/v4l2-common.c > index 554c591e1113..77a0daa92c2b 100644 > --- a/drivers/media/v4l2-core/v4l2-common.c > +++ b/drivers/media/v4l2-core/v4l2-common.c > @@ -309,7 +309,7 @@ const struct v4l2_format_info *v4l2_format_info(u32 f= ormat) > =C2=A0 /* Tiled YUV formats */ > =C2=A0 { .format =3D V4L2_PIX_FMT_NV12_4L4, .pixel_enc =3D V4L2_PIXEL_EN= C_YUV, .mem_planes =3D 1, .comp_planes =3D 2, .bpp =3D { 1, 2, 0, 0 }, .bpp= _div =3D { 1, 1, 1, 1 }, .hdiv =3D 2, .vdiv =3D 2 }, > =C2=A0 { .format =3D V4L2_PIX_FMT_NV15_4L4, .pixel_enc =3D V4L2_PIXEL_EN= C_YUV, .mem_planes =3D 1, .comp_planes =3D 2, .bpp =3D { 5, 10, 0, 0 }, .bp= p_div =3D { 4, 4, 1, 1 }, .hdiv =3D 2, .vdiv =3D 2, > - =C2=A0 .block_w =3D { 4, 2, 0, 0 }, .block_h =3D { 1, 1, 0, 0 }}, > + =C2=A0 .block_w =3D { 4, 4, 0, 0 }, .block_h =3D { 4, 4, 0, 0 }}, Only the block_h is broken. The block_w is in "pixels" which for the UV pla= ne is component pairs. So both set of tiles have 5bytes stride. But since the sec= ond set, the UV tiles, are interleaved, they only have 2 pairs of UV per row. S= o to me the correct fix is: + .block_w =3D { 4, 2, 0, 0 }, .block_h =3D { 4, 4, 0, 0 }}, If its not the case for the camera pipeline, then a new format is needed, s= ince this format should perfectly match NV15 + VIVANTE_TILED in the DRM world. regards, Nicolas > =C2=A0 { .format =3D V4L2_PIX_FMT_P010_4L4, .pixel_enc =3D V4L2_PIXEL_EN= C_YUV, .mem_planes =3D 1, .comp_planes =3D 2, .bpp =3D { 2, 4, 0, 0 }, .bpp= _div =3D { 1, 1, 1, 1 }, .hdiv =3D 2, .vdiv =3D 2 }, > =C2=A0 > =C2=A0 /* YUV planar formats, non contiguous variant */ --=-GJ5iBdhdx0UoTc8uYpG1 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTvDVKBFcTDwhoEbxLZQZRRKWBy9AUCagx+wQAKCRDZQZRRKWBy 9H3cAQCZckjwaH4Ua7bFNH0TlIe7qNnm4JBXewMsZ3UzDAKbHAD+MzI3Pek25YiV cuO2+w5f3DUEwgpRmjCUKnqmGO9WqQ4= =HPXQ -----END PGP SIGNATURE----- --=-GJ5iBdhdx0UoTc8uYpG1--