linux-kernel - Re: [PATCH v9 4/5] spi: dw: Add DMA address widths capability check

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Date:   Tue, 9 May 2023 13:55:41 +0530
From:   Joy Chakraborty <joychakr@...gle.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        manugautam@...gle.com, rohitner@...gle.com
Subject: Re: [PATCH v9 4/5] spi: dw: Add DMA address widths capability check

On Mon, May 8, 2023 at 6:46 PM Mark Brown <broonie@...nel.org> wrote:
>
> On Thu, Apr 27, 2023 at 12:33:13PM +0000, Joy Chakraborty wrote:
> > Store address width capabilities of DMA controller during init and check
> > the same per transfer to make sure the bits/word requirement can be met.
> >
> > Current DW DMA driver requires both tx and rx channel to be configured
> > and functional hence a subset of both tx and rx channel address width
> > capability is checked with the width requirement(n_bytes) for a
> > transfer.
>
> This breaks an x86 allmodconfig build:
>
> /build/stage/linux/drivers/spi/spi-dw-dma.c: In function ‘dw_spi_dma_caps_init’:
> /build/stage/linux/drivers/spi/spi-dw-dma.c:100:1: error: control reaches end of non-void function [-Werror=return-type]
>   100 | }
>       | ^
> cc1: some warnings being treated as errors

Moving "return 0" at the end of dw_spi_dma_caps_init() from patch
[4/5] to patch [3/5] to solve this and sending a V10 Patch.

Thanks
Joy