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Date:   Thu, 30 Nov 2023 16:35:08 +0000
From:   Conor Dooley <conor@kernel.org>
To:     Randy Dunlap <rdunlap@infradead.org>
Cc:     Stephen Rothwell <sfr@canb.auug.org.au>,
        Linux Next Mailing List <linux-next@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-riscv <linux-riscv@lists.infradead.org>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        "Lad, Prabhakar" <prabhakar.csengg@gmail.com>
Subject: Re: linux-next: Tree for Nov 22 (riscv: DMA_GLOBAL_POOL)
Message-ID: <20231130-mothproof-tripod-fe35364591ee@spud>
References: <20231122145257.6f668afa@canb.auug.org.au>
 <24942b4d-d16a-463f-b39a-f9dfcb89d742@infradead.org>
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On Wed, Nov 22, 2023 at 02:37:43PM -0800, Randy Dunlap wrote:
>=20
>=20
> On 11/21/23 19:52, Stephen Rothwell wrote:
> > Hi all,
> >=20
> > Changes since 20231121:
> >=20
>=20
> on riscv 32-bit:
>=20
> WARNING: unmet direct dependencies detected for DMA_GLOBAL_POOL
>   Depends on [n]: !ARCH_HAS_DMA_SET_UNCACHED [=3Dn] && !DMA_DIRECT_REMAP =
[=3Dy]
>   Selected by [y]:
>   - ARCH_R9A07G043 [=3Dy] && SOC_RENESAS [=3Dy] && RISCV [=3Dy] && NONPOR=
TABLE [=3Dy] && RISCV_ALTERNATIVE [=3Dy] && !RISCV_ISA_ZICBOM [=3Dn] && RIS=
CV_SBI [=3Dy]
>=20
> WARNING: unmet direct dependencies detected for DMA_GLOBAL_POOL
>   Depends on [n]: !ARCH_HAS_DMA_SET_UNCACHED [=3Dn] && !DMA_DIRECT_REMAP =
[=3Dy]
>   Selected by [y]:
>   - ARCH_R9A07G043 [=3Dy] && SOC_RENESAS [=3Dy] && RISCV [=3Dy] && NONPOR=
TABLE [=3Dy] && RISCV_ALTERNATIVE [=3Dy] && !RISCV_ISA_ZICBOM [=3Dn] && RIS=
CV_SBI [=3Dy]

DMA_DIRECT_REMAP is selected by the T-HEAD CMO erratum.
DMA_GLOBAL_POOL by the Andes CMO erratum.

We could do

diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
index 0071864c2111..d8723fdf1e55 100644
--- a/drivers/soc/renesas/Kconfig
+++ b/drivers/soc/renesas/Kconfig
@@ -339,6 +339,7 @@ if RISCV
=20
 config ARCH_R9A07G043
 	bool "RISC-V Platform support for RZ/Five"
+	depends on !DMA_DIRECT_REMAP
 	depends on NONPORTABLE
 	depends on RISCV_ALTERNATIVE
 	depends on !RISCV_ISA_ZICBOM


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