linux-kernel - Re: [PATCH 08/21] spi: s3c64xx: move error check up to avoid rechecking

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Date: Wed, 24 Jan 2024 09:21:43 +0000
From: André Draszik <andre.draszik@...aro.org>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, broonie@...nel.org, 
	andi.shyti@...nel.org, arnd@...db.de
Cc: robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
 conor+dt@...nel.org,  alim.akhtar@...sung.com, linux-spi@...r.kernel.org, 
 linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-arch@...r.kernel.org, peter.griffin@...aro.org,
 semen.protsenko@...aro.org,  kernel-team@...roid.com,
 willmcvicker@...gle.com
Subject: Re: [PATCH 08/21] spi: s3c64xx: move error check up to avoid
 rechecking

Hi Tudor,

On Tue, 2024-01-23 at 15:34 +0000, Tudor Ambarus wrote:
> @@ -538,13 +538,8 @@ static int s3c64xx_wait_for_dma(struct s3c64xx_spi_driver_data *sdd,
>  			cpu_relax();
>  			status = readl(regs + S3C64XX_SPI_STATUS);
>  		}
> -
>  	}
>  
> -	/* If timed out while checking rx/tx status return error */
> -	if (!val)
> -		return -EIO;
> -

This change behaviour of this function. The loop just above adjusts val and it is used to
determine if there was a timeout or not:

	if (val && !xfer->rx_buf) {
		val = msecs_to_loops(10);
		status = readl(regs + S3C64XX_SPI_STATUS);
		while ((TX_FIFO_LVL(status, sdd)
			|| !S3C64XX_SPI_ST_TX_DONE(status, sdd))
		       && --val) {
			cpu_relax();
			status = readl(regs + S3C64XX_SPI_STATUS);
		}


That doesn't work anymore now.

Cheers,
Andre'