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

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Date: Wed, 24 Jan 2024 09:32:25 +0000
From: Tudor Ambarus <tudor.ambarus@...aro.org>
To: André Draszik <andre.draszik@...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



On 1/24/24 09:21, André Draszik wrote:
> Hi Tudor,
> 

Hi!

> 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);
> 		}
>
Oh, yes, the timeout in this block. You're right, I'll drop the patch.
Thanks!

ta