From: "Jernej Škrabec" <jernej.skrabec@gmail.com>
To: Ulf Hansson <ulf.hansson@linaro.org>,
linux-mmc@vger.kernel.org, Samuel Holland <samuel@sholland.org>
Cc: Samuel Holland <samuel@sholland.org>,
Andre Przywara <andre.przywara@arm.com>,
Chen-Yu Tsai <wens@csie.org>, Maxime Ripard <maxime@cerno.tech>,
Yangtao Li <frank@allwinnertech.com>,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-sunxi@lists.linux.dev
Subject: Re: [PATCH] mmc: sunxi-mmc: Fix DMA descriptors allocated above 32 bits
Date: Mon, 25 Apr 2022 17:38:37 +0200 [thread overview]
Message-ID: <7372337.EvYhyI6sBW@kista> (raw)
In-Reply-To: <20220424231751.32053-1-samuel@sholland.org>
Dne ponedeljek, 25. april 2022 ob 01:17:50 CEST je Samuel Holland napisal(a):
> Newer variants of the MMC controller support a 34-bit physical address
> space by using word addresses instead of byte addresses. However, the
> code truncates the DMA descriptor address to 32 bits before applying the
> shift. This breaks DMA for descriptors allocated above the 32-bit limit.
>
> Fixes: 3536b82e5853 ("mmc: sunxi: add support for A100 mmc controller")
> Signed-off-by: Samuel Holland <samuel@sholland.org>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Best regards,
Jernej
> ---
>
> drivers/mmc/host/sunxi-mmc.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
> index c62afd212692..46f9e2923d86 100644
> --- a/drivers/mmc/host/sunxi-mmc.c
> +++ b/drivers/mmc/host/sunxi-mmc.c
> @@ -377,8 +377,9 @@ static void sunxi_mmc_init_idma_des(struct
sunxi_mmc_host *host,
> pdes[i].buf_addr_ptr1 =
> cpu_to_le32(sg_dma_address(&data->sg[i]) >>
> host->cfg->idma_des_shift);
> - pdes[i].buf_addr_ptr2 = cpu_to_le32((u32)next_desc >>
> - host-
>cfg->idma_des_shift);
> + pdes[i].buf_addr_ptr2 =
> + cpu_to_le32(next_desc >>
> + host->cfg->idma_des_shift);
> }
>
> pdes[0].config |= cpu_to_le32(SDXC_IDMAC_DES0_FD);
> --
> 2.35.1
>
>
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next prev parent reply other threads:[~2022-04-25 15:39 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-24 23:17 [PATCH] mmc: sunxi-mmc: Fix DMA descriptors allocated above 32 bits Samuel Holland
2022-04-25 11:03 ` Andre Przywara
2022-04-25 15:38 ` Jernej Škrabec [this message]
2022-05-04 10:37 ` Ulf Hansson
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