linux-kernel - Re: [PATCH v3 12/12] spi: s3c64xx: switch exynos850 to new port config data

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Message-ID: <10f692ae-ac7a-4243-aadc-80712f781d39@linaro.org>
Date: Wed, 21 Feb 2024 17:56:16 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: broonie@...nel.org, robh@...nel.org, andi.shyti@...nel.org,
 krzysztof.kozlowski@...aro.org, semen.protsenko@...aro.org,
 conor+dt@...nel.org
Cc: alim.akhtar@...sung.com, linux-spi@...r.kernel.org,
 linux-samsung-soc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, andre.draszik@...aro.org,
 peter.griffin@...aro.org, kernel-team@...roid.com, willmcvicker@...gle.com,
 devicetree@...r.kernel.org
Subject: Re: [PATCH v3 12/12] spi: s3c64xx: switch exynos850 to new port
 config data


Hey, Sam,


On 2/16/24 07:05, Tudor Ambarus wrote:
> Exynos850 has the same version of USI SPI (v2.1) as GS101.

I tested GS101 and it worked, I guess exynos850 SPI shall work too as it
uses the same SPI version, v2.1. Can you run a test on your side too see
if works? If not, Mark can drop this patch I guess. Please let us know
your preference.

Cheers,
ta

> Drop the fifo_lvl_mask and rx_lvl_offset and switch to the new port
> config data.
> 
> Backward compatibility with DT is not broken because when alises are
> set:
> - the SPI core will set the bus number according to the alias ID
> - the FIFO depth is always the same size for exynos850 (64 bytes) no
>   matter the alias ID number.
> 
> Advantages of the change:
> - drop dependency on the OF alias ID.
> - FIFO depth is inferred from the compatible. Exynos850 integrates 3 SPI
>   IPs, all with 64 bytes FIFO depths.
> - use full mask for SPI_STATUS.{RX, TX}_FIFO_LVL fields. Using partial
>   masks is misleading and can hide problems of the driver logic.
> 
> Just compiled tested.
> 
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...aro.org>
> ---
>  drivers/spi/spi-s3c64xx.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
> index 784786407d2e..9fcbe040cb2f 100644
> --- a/drivers/spi/spi-s3c64xx.c
> +++ b/drivers/spi/spi-s3c64xx.c
> @@ -1576,10 +1576,9 @@ static const struct s3c64xx_spi_port_config exynos5433_spi_port_config = {
>  };
>  
>  static const struct s3c64xx_spi_port_config exynos850_spi_port_config = {
> -	/* fifo_lvl_mask is deprecated. Use {rx, tx}_fifomask instead. */
> -	.fifo_lvl_mask	= { 0x7f, 0x7f, 0x7f },
> -	/* rx_lvl_offset is deprecated. Use {rx, tx}_fifomask instead. */
> -	.rx_lvl_offset	= 15,
> +	.fifo_depth	= 64,
> +	.rx_fifomask	= S3C64XX_SPI_ST_RX_FIFO_RDY_V2,
> +	.tx_fifomask	= S3C64XX_SPI_ST_TX_FIFO_RDY_V2,
>  	.tx_st_done	= 25,
>  	.clk_div	= 4,
>  	.high_speed	= true,