From: Stefan Agner <stefan-XLVq0VzYD2Y@public.gmane.org>
To: Sanchayan Maity <maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH 3/4] spi: spi-fsl-dspi: Fix continuous selection format
Date: Thu, 17 Nov 2016 17:07:24 -0800 [thread overview]
Message-ID: <c1c4a3f3eac6d4e7378971431bd5f595@agner.ch> (raw)
In-Reply-To: <c1e51fc92dbcc9c31dcdcdfab3eed40d7745308a.1479384571.git.maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
On 2016-11-17 04:16, Sanchayan Maity wrote:
> Current DMA implementation was not handling the continuous selection
> format viz. SPI chip select would be deasserted even between sequential
> serial transfers. Use the cs_change variable and correctly set or
> reset the CONT bit accordingly for case where peripherals require
> the chip select to be asserted between sequential transfers.
>
> Signed-off-by: Sanchayan Maity <maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
> ---
> drivers/spi/spi-fsl-dspi.c | 13 ++++++++++---
> 1 file changed, 10 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
> index aee8c88..164e2e1 100644
> --- a/drivers/spi/spi-fsl-dspi.c
> +++ b/drivers/spi/spi-fsl-dspi.c
> @@ -258,9 +258,16 @@ static int dspi_next_xfer_dma_submit(struct fsl_dspi *dspi)
> }
>
> val = tx_word ? *(u16 *) dspi->tx : *(u8 *) dspi->tx;
> - dspi->dma->tx_dma_buf[i] = SPI_PUSHR_TXDATA(val) |
> - SPI_PUSHR_PCS(dspi->cs) |
> - SPI_PUSHR_CTAS(0);
> + if (dspi->cs_change) {
> + dspi->dma->tx_dma_buf[i] = SPI_PUSHR_TXDATA(val) |
> + SPI_PUSHR_PCS(dspi->cs) |
> + SPI_PUSHR_CTAS(0);
> + } else {
> + dspi->dma->tx_dma_buf[i] = SPI_PUSHR_TXDATA(val) |
> + SPI_PUSHR_PCS(dspi->cs) |
> + SPI_PUSHR_CTAS(0) |
> + SPI_PUSHR_CONT;
> + }
How about:
dspi->dma->tx_dma_buf[i] = SPI_PUSHR_TXDATA(val) |
SPI_PUSHR_PCS(dspi->cs) |
SPI_PUSHR_CTAS(0);
+ if (dspi->cs_change)
+ dspi->dma->tx_dma_buf[i] |= SPI_PUSHR_CONT;
Avoids code duplication...
--
Stefan
> dspi->tx += tx_word + 1;
>
> dma->tx_desc = dmaengine_prep_slave_single(dma->chan_tx,
--
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next prev parent reply other threads:[~2016-11-18 1:07 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-10 12:19 [PATCH v3] spi: spi-fsl-dspi: Add DMA support for Vybrid Sanchayan Maity
[not found] ` <836dd6a84fa149cafdbb0b53e792d305febf6207.1478778329.git.maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-11-11 12:20 ` Mark Brown
2016-11-17 12:16 ` [PATCH 0/4] Fixes for Vybrid SPI DMA implementation Sanchayan Maity
2016-11-17 12:16 ` [PATCH 1/4] spi: spi-fsl-dspi: Fix SPI transfer issue when using multiple SPI_IOC_MESSAGE Sanchayan Maity
[not found] ` <bbdbc8df434dd2af74eb351b799a2812a1c1967e.1479384571.git.maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-11-18 0:52 ` Stefan Agner
2016-11-21 19:20 ` Applied "spi: spi-fsl-dspi: Fix SPI transfer issue when using multiple SPI_IOC_MESSAGE" to the spi tree Mark Brown
2016-11-17 12:16 ` [PATCH 2/4] spi: spi-fsl-dspi: Fix incorrect DMA setup Sanchayan Maity
[not found] ` <d83f4896d77f577ca92fd70534f6198bb3288d8a.1479384571.git.maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-11-18 1:03 ` Stefan Agner
[not found] ` <bc8d9b808b99d3b217361df6fa8853ea-XLVq0VzYD2Y@public.gmane.org>
2016-11-18 8:04 ` maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w
[not found] ` <20161118080403.GB1572-2b/appYahYDPUjlVagVGR1Kr0EmMEXJSn9A1Ff6Mc9Q@public.gmane.org>
2016-11-18 23:39 ` Stefan Agner
2016-11-17 12:16 ` [PATCH 3/4] spi: spi-fsl-dspi: Fix continuous selection format Sanchayan Maity
[not found] ` <c1e51fc92dbcc9c31dcdcdfab3eed40d7745308a.1479384571.git.maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-11-18 1:07 ` Stefan Agner [this message]
[not found] ` <c1c4a3f3eac6d4e7378971431bd5f595-XLVq0VzYD2Y@public.gmane.org>
2016-11-18 7:59 ` maitysanchayan-Re5JQEeQqe8AvxtiuMwx3w
2016-11-17 12:16 ` [PATCH 4/4] spi: spi-fsl-dspi: Minor code cleanup and error path fixes Sanchayan Maity
2016-11-11 13:05 ` Applied "spi: spi-fsl-dspi: Add DMA support for Vybrid" to the spi tree Mark Brown
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