linux-kernel - Re: [PATCH] staging: rts5208: Replace delay function.

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Date:   Wed, 18 Oct 2023 09:03:39 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     kenechukwu maduechesi <maduechesik@...il.com>
cc:     outreachy@...ts.linux.dev, shreeya.patel23498@...il.com,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: rts5208: Replace delay function.



On Tue, 17 Oct 2023, kenechukwu maduechesi wrote:

> Replace udelay() with usleep_range() for more precise delay handling.
>
> Reported by checkpatch:
>
> CHECK: usleep_range is preferred over udelay

This message is typically not a good candidate for outreachy patches,
because you need access to the device to be sure that any change is
correct.

julia

>
> Signed-off-by: kenechukwu maduechesi <maduechesik@...il.com>
> ---
>  drivers/staging/rts5208/sd.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/staging/rts5208/sd.c b/drivers/staging/rts5208/sd.c
> index 74c4f476b3a4..059f99b0a727 100644
> --- a/drivers/staging/rts5208/sd.c
> +++ b/drivers/staging/rts5208/sd.c
> @@ -865,7 +865,7 @@ static int sd_change_phase(struct rtsx_chip *chip, u8 sample_point, u8 tune_dir)
>  						     PHASE_CHANGE);
>  			if (retval)
>  				return retval;
> -			udelay(50);
> +			usleep_range(50);
>  			retval = rtsx_write_register(chip, SD_VP_CTL, 0xFF,
>  						     PHASE_CHANGE |
>  						     PHASE_NOT_RESET |
> @@ -877,14 +877,14 @@ static int sd_change_phase(struct rtsx_chip *chip, u8 sample_point, u8 tune_dir)
>  						     CHANGE_CLK, CHANGE_CLK);
>  			if (retval)
>  				return retval;
> -			udelay(50);
> +			usleep_range(50);
>  			retval = rtsx_write_register(chip, SD_VP_CTL, 0xFF,
>  						     PHASE_NOT_RESET |
>  						     sample_point);
>  			if (retval)
>  				return retval;
>  		}
> -		udelay(100);
> +		usleep_range(100);
>
>  		rtsx_init_cmd(chip);
>  		rtsx_add_cmd(chip, WRITE_REG_CMD, SD_DCMPS_CTL, DCMPS_CHANGE,
> @@ -918,7 +918,7 @@ static int sd_change_phase(struct rtsx_chip *chip, u8 sample_point, u8 tune_dir)
>  				return retval;
>  		}
>
> -		udelay(50);
> +		usleep_range(50);
>  	}
>
>  	retval = rtsx_write_register(chip, SD_CFG1, SD_ASYNC_FIFO_NOT_RST, 0);
> @@ -1416,7 +1416,7 @@ static int sd_wait_data_idle(struct rtsx_chip *chip)
>  			retval = STATUS_SUCCESS;
>  			break;
>  		}
> -		udelay(100);
> +		usleep_range(100);
>  	}
>  	dev_dbg(rtsx_dev(chip), "SD_DATA_STATE: 0x%02x\n", val);
>
> --
> 2.25.1
>
>
>