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boundary="------------dy8v7H7PjoXYzuxess9049r0"; protected-headers="v1" From: Matt Coster To: =?UTF-8?Q?Niklas_S=C3=B6derlund?= Cc: Marek Vasut , Geert Uytterhoeven , Conor Dooley , David Airlie , Frank Binns , Alessio Belle , Alexandru Dadu , Krzysztof Kozlowski , Maarten Lankhorst , Magnus Damm , Maxime Ripard , Rob Herring , Simona Vetter , Thomas Zimmermann , devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-renesas-soc@vger.kernel.org Message-ID: Subject: Re: [PATCH 2/2] arm64: dts: renesas: r8a779a0: Add GE7800 GPU node References: <20251105232737.1933437-1-niklas.soderlund+renesas@ragnatech.se> <20251105232737.1933437-3-niklas.soderlund+renesas@ragnatech.se> <20251106103904.GD3684509@ragnatech.se> In-Reply-To: <20251106103904.GD3684509@ragnatech.se> --------------dy8v7H7PjoXYzuxess9049r0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Hi Niklas, On 06/11/2025 10:39, Niklas S=C3=B6derlund wrote: > Hi Matt, >=20 > Thanks for your feedback. >=20 > On 2025-11-06 10:19:13 +0000, Matt Coster wrote: >> Hi Niklas, >> >> On 05/11/2025 23:27, Niklas S=C3=B6derlund wrote: >>> Describe Imagination Technologies PowerVR Rogue GE7800 BNVC 15.5.1.64= >>> present in Renesas R-Car R8A779A0 V3U SoC. >>> >>> Signed-off-by: Niklas S=C3=B6derlund >>> --- >>> arch/arm64/boot/dts/renesas/r8a779a0.dtsi | 17 +++++++++++++++++ >>> 1 file changed, 17 insertions(+) >>> >>> diff --git a/arch/arm64/boot/dts/renesas/r8a779a0.dtsi b/arch/arm64/b= oot/dts/renesas/r8a779a0.dtsi >>> index b08865841476..aa347b699340 100644 >>> --- a/arch/arm64/boot/dts/renesas/r8a779a0.dtsi >>> +++ b/arch/arm64/boot/dts/renesas/r8a779a0.dtsi >>> @@ -338,6 +338,23 @@ cmt3: timer@e6148000 { >>> status =3D "disabled"; >>> }; >>> =20 >>> + gsx: gsx@fd000000 { >> >> Why gsx? Marek's equivalent patch for r8a77965-gpu[1] used gpu (as we = do >> for every dt so far). >=20 > Wops, will fix. >=20 >> >>> + compatible =3D "renesas,r8a779a0-gpu", >>> + "img,img-ge7800", >>> + "img,img-rogue"; >>> + reg =3D <0 0xfd000000 0 0x40000>; >>> + interrupts =3D ; >>> + clocks =3D <&cpg CPG_CORE R8A779A0_CLK_ZG>, >>> + <&cpg CPG_CORE R8A779A0_CLK_S3D1>, >>> + <&cpg CPG_MOD 0>; >> >> I don't have access to a TRM for V3U (it's too new apparently, despite= >> already being obsolete), but I believe the GPU integration should be >> similar to the M3N in [1]. In that case, the TRM (v2.40, fig 23.3) sho= ws >> S2D1 and 112 in place of S3D1 and 0 =E2=80=93 are these definitely cor= rect? The >> 0 especially feels wrong (see also 8A.2.1.2 MSTPSR1). >=20 > Yea the V3U doc I have is not the latest. The diagram in the GPU chapte= r=20 > list the same as you say here (S2D1 and 112), however the diagram seems= =20 > to just be a copy-past of the Gen3 document. Looking elsewhere in the=20 > document I see: >=20 > - In the clock chapter the GPU is list as MSTP0 and not MSTP112. =20 > Comparing with the Gen3 doc this looks correct so MSTP0 is good IMHO.= Sounds reasonable. Just to cross-reference that, does 3DGE appear in the 0-bit row of the table under the register definition of MSTPSR0? I see from renesas-cpg-mssr.c that these registers have moved for gen4 though, so this could be a blind alley. A similar thought =E2=80=93 is a new entry in r8a779a0_mod_clks (defined = in r8a779a0-cpg-mssr.c) required? The equivalent table for r8a77965 has a "3dge" entry at 112. >=20 > - The V3U don't have a S2D1 clock... but the GPU chapter lists it in th= e=20 > (assumed) copy-pasted diagram... What I did was track which clocks=20 > where S2D1 on Gen3 and compared that to what those IP where using on = > V3U. The overlap was the DU and that uses S3D1 on V3U so I just=20 > followed that. There's a top-level clock diagram near the top of the CPG chapter in the TRM I have (fig 8.1d for M3N) that annotates S2D1 as being an AXI-bus clock. Is there a similar annotation on S3D1 for V3U in your TRM? If not, I'm happy to just follow your logic and ack this patch :) Cheers, Matt >=20 >> >>> + clock-names =3D "core", "mem", "sys"; >>> + power-domains =3D <&sysc R8A779A0_PD_3DG_A>, >>> + <&sysc R8A779A0_PD_3DG_B>; >>> + power-domain-names =3D "a", "b"; >>> + resets =3D <&cpg 0>; >> >> Same 0 concern as above. >> >> Cheers, >> Matt >> >> [1]: https://lore.kernel.org/r/20251104135716.12497-3-marek.vasut+rene= sas@mailbox.org/=20 >> >>> + status =3D "disabled"; >>> + }; >>> + >>> cpg: clock-controller@e6150000 { >>> compatible =3D "renesas,r8a779a0-cpg-mssr"; >>> reg =3D <0 0xe6150000 0 0x4000>; >> >> --=20 >> Matt Coster >> E: matt.coster@imgtec.com --=20 Matt Coster E: matt.coster@imgtec.com --------------dy8v7H7PjoXYzuxess9049r0-- --------------JLIexLG2iivWgxdD9farTWB2 Content-Type: application/pgp-signature; name="OpenPGP_signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="OpenPGP_signature.asc" -----BEGIN PGP SIGNATURE----- wnsEABYIACMWIQS4qDmoJvwmKhjY+nN5vBnz2d5qsAUCaQyc0wUDAAAAAAAKCRB5vBnz2d5qsC7O APwLt4KapLM6g+14n4Kz4JL3utbcZm6d4DyB6P0WYFbPYAEA1fNBEirp8ot0ZREj7EUo+EG90x6s MiexdiI5XqtPNw8= =5A0b -----END PGP SIGNATURE----- --------------JLIexLG2iivWgxdD9farTWB2--