linux-kernel - RE: [PATCH v3] spi: img-spfi: Same Edge bit set to double supported transfer speed

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Date:	Thu, 18 Jun 2015 12:52:11 +0000
From:	Sifan Naeem <Sifan.Naeem@...tec.com>
To:	"broonie@...nel.org" <broonie@...nel.org>
CC:	"linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"abrestic@...omium.org" <abrestic@...omium.org>
Subject: RE: [PATCH v3] spi: img-spfi: Same Edge bit set to double supported
 transfer speed

Please ignore this patch. I have posted a new patch as a fix after the discussion with Jonas Gorski.

https://patchwork.kernel.org/patch/6636761/ spi: img-spfi: fix support for speeds up to 1/4th input clock

Thanks,
Sifan

> -----Original Message-----
> From: Sifan Naeem
> Sent: 17 June 2015 11:48
> To: broonie@...nel.org
> Cc: linux-spi@...r.kernel.org; linux-kernel@...r.kernel.org;
> abrestic@...omium.org; Sifan Naeem
> Subject: [PATCH v3] spi: img-spfi: Same Edge bit set to double supported
> transfer speed
> 
> Same edge bit set in SPFI Control register to double the supported spfi clock
> speed. Setting this bit increases the supported spfi frequency from 1/8 to 1/4
> of the core clock frequency.
> 
> Without this bit set the maximum speed supported was 25MHz on Pistachio.
> 
> Signed-off-by: Sifan Naeem <sifan.naeem@...tec.com>
> ---
>  changes from v2: Gerrit Change-Id removed from commit message
>  drivers/spi/spi-img-spfi.c |    2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c index
> 788e2b1..acce90a 100644
> --- a/drivers/spi/spi-img-spfi.c
> +++ b/drivers/spi/spi-img-spfi.c
> @@ -40,6 +40,7 @@
>  #define SPFI_CONTROL_SOFT_RESET			BIT(11)
>  #define SPFI_CONTROL_SEND_DMA			BIT(10)
>  #define SPFI_CONTROL_GET_DMA			BIT(9)
> +#define SPFI_CONTROL_SE			BIT(8)
>  #define SPFI_CONTROL_TMODE_SHIFT		5
>  #define SPFI_CONTROL_TMODE_MASK			0x7
>  #define SPFI_CONTROL_TMODE_SINGLE		0
> @@ -491,6 +492,7 @@ static void img_spfi_config(struct spi_master
> *master, struct spi_device *spi,
>  	else if (xfer->tx_nbits == SPI_NBITS_QUAD &&
>  		 xfer->rx_nbits == SPI_NBITS_QUAD)
>  		val |= SPFI_CONTROL_TMODE_QUAD <<
> SPFI_CONTROL_TMODE_SHIFT;
> +	val |= SPFI_CONTROL_SE;
>  	spfi_writel(spfi, val, SPFI_CONTROL);
>  }
> 
> --
> 1.7.9.5

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