From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: Sascha Hauer <s.hauer@pengutronix.de>,
Barebox List <barebox@lists.infradead.org>
Subject: Re: [PATCH] mci: dw_mmc: set dma mask to work correctly on 64bit platforms
Date: Fri, 11 Jun 2021 10:23:25 +0200 [thread overview]
Message-ID: <a08e527d-7557-a2fa-1bef-c3875a4c9072@pengutronix.de> (raw)
In-Reply-To: <20210610131032.6645-1-s.hauer@pengutronix.de>
Hello Sascha,
On 10.06.21 15:10, Sascha Hauer wrote:
> The variant we support currently can only do 32bit DMA. Adjust dma mask
> accordingly. Also use dma_map_single() rather than dma_sync_single() to
> actually get errors when the mapping fails.
>
> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Tested-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
On a StarFive JH7100 (64-bit CPU, 32-bit MMC controller, non-1:1 mapping for
coherent DMA).
> host->idmac = dma_alloc_coherent(sizeof(*host->idmac) * DW_MMC_NUM_IDMACS,
> - DMA_ADDRESS_BROKEN);
> + &host->idmac_dma);
> + if (!host->idmac)
That works for Linux, but not for barebox: barebox dma_alloc_coherent doesn't have
a dev parameter, so it can't check for dma_mapping_error() internally.
dma_alloc_coherent also never returns NULL in barebox, all implementations, except
for kvx, abort if no memory could be allocated.
> + return PTR_ERR(-ENOMEM);
-ENOMEM is no pointer.
>
> host->mci.send_cmd = dwmci_cmd;
> host->mci.set_ios = dwmci_set_ios;
>
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next prev parent reply other threads:[~2021-06-11 8:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-10 13:10 Sascha Hauer
2021-06-11 8:23 ` Ahmad Fatoum [this message]
2021-06-11 10:02 ` Sascha Hauer
2021-06-11 10:40 ` Ahmad Fatoum
2021-06-11 8:26 ` Ahmad Fatoum
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