linux-kernel - Re: [PATCH v3 5/8] mtd: spi-nor: cadence-quadspi: Handle probe deferral while requesting DMA channel

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Date:   Mon, 1 Jun 2020 06:31:13 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <vigneshr@...com>
CC:     <broonie@...nel.org>, <bbrezillon@...nel.org>,
        <vadivel.muruganx.ramuthevar@...ux.intel.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>, <simon.k.r.goldschmidt@...il.com>,
        <dinguyen@...nel.org>, <marex@...x.de>
Subject: Re: [PATCH v3 5/8] mtd: spi-nor: cadence-quadspi: Handle probe
 deferral while requesting DMA channel

On Monday, June 1, 2020 8:47:22 AM EEST Vignesh Raghavendra wrote:
> dma_request_chan_by_mask() can throw EPROBE_DEFER if DMA provider
> is not yet probed. Currently driver just falls back to using PIO mode
> (which is less efficient) in this case. Instead return probe deferral
> error as is so that driver will be re probed once DMA provider is
> available.
> 
> Signed-off-by: Vignesh Raghavendra <vigneshr@...com>
> ---
>  .../mtd/spi-nor/controllers/cadence-quadspi.c  | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)

Reviewed-by: Tudor Ambarus <tudor.ambarus@...rochip.com>