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From:   Jisheng Zhang <jszhang@kernel.org>
To:     Geert Uytterhoeven <geert+renesas@glider.be>,
        Magnus Damm <magnus.damm@gmail.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Cc:     linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-riscv@lists.infradead.org,
        Robin Murphy <robin.murphy@arm.com>,
        Christoph Hellwig <hch@lst.de>,
        Drew Fustini <dfustini@baylibre.com>
Subject: [PATCH] soc: renesas: make ARCH_R9A07G043 (riscv version) depend on NONPORTABLE
Date:   Wed,  4 Oct 2023 23:08:56 +0800
Message-Id: <20231004150856.2540-1-jszhang@kernel.org>
MIME-Version: 1.0
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Drew found "CONFIG_DMA_GLOBAL_POOL=y causes ADMA buffer alloc to fail"
the log looks like:
[    3.741083] mmc0: Unable to allocate ADMA buffers - falling back to standard DMA

The logic is: generic riscv defconfig selects ARCH_RENESAS then
ARCH_R9A07G043 which selects DMA_GLOBAL_POOL, which assumes all
non-dma-coherent riscv platforms have a dma global pool, this assumption
seems not correct. And I believe DMA_GLOBAL_POOL should not be
selected by ARCH_SOCFAMILIY, instead, only ARCH under some specific
conditions can select it globaly, for example NOMMU ARM and so on,
because it's designed for special cases such as "nommu cases where
non-cacheable memory lives in a fixed place in the physical address
map" as pointed out by Robin.

Fix the issue by making ARCH_R9A07G043 (riscv version) depend on
NONPORTABLE, thus generic defconfig won't select ARCH_R9A07G043 by
default. And even for random config case, there will be less debug
effort once we see NONPORTABLE is enabled.

Reported-by: Drew Fustini <dfustini@baylibre.com>
Closes: https://lore.kernel.org/linux-riscv/ZRuamJuShOnvP1pr@x1/
Fixes: 484861e09f3e ("soc: renesas: Kconfig: Select the required configs for RZ/Five SoC")
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
---
 drivers/soc/renesas/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/soc/renesas/Kconfig b/drivers/soc/renesas/Kconfig
index 5a75ab64d1ed..12040ce116a5 100644
--- a/drivers/soc/renesas/Kconfig
+++ b/drivers/soc/renesas/Kconfig
@@ -333,6 +333,7 @@ if RISCV
 
 config ARCH_R9A07G043
 	bool "RISC-V Platform support for RZ/Five"
+	depends on NONPORTABLE
 	select ARCH_RZG2L
 	select AX45MP_L2_CACHE if RISCV_DMA_NONCOHERENT
 	select DMA_GLOBAL_POOL
-- 
2.40.1