linux-kernel - Re: [PATCH] staging: media: atomisp: Use GENMASK instead of manual masking

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Message-ID: <YgERD7JdlqdaNHuA@smile.fi.intel.com>
Date:   Mon, 7 Feb 2022 14:31:11 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Moses Christopher Bollavarapu <mosescb.dev@...il.com>
Cc:     gregkh@...uxfoundation.org, joe@...ches.com, kitakar@...il.com,
        laurent.pinchart@...asonboard.com, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, linux-staging@...ts.linux.dev,
        mchehab@...nel.org, sakari.ailus@...ux.intel.com,
        tomi.valkeinen@...asonboard.com, dan.carpenter@...cle.com
Subject: Re: [PATCH] staging: media: atomisp: Use GENMASK instead of manual
 masking

On Sun, Feb 06, 2022 at 07:58:30PM +0100, Moses Christopher Bollavarapu wrote:
> There is a GENMASK macro available in linux/bits.h, for masking.
> 
> Example: GENMASK(3, 0) = 0b00001111 (same as (1 << 4) - 1)

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Signed-off-by: Moses Christopher Bollavarapu <mosescb.dev@...il.com>
> ---
>  drivers/staging/media/atomisp/pci/atomisp_compat_css20.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c b/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
> index 1173be0e72b0..a345fa1d7de9 100644
> --- a/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
> +++ b/drivers/staging/media/atomisp/pci/atomisp_compat_css20.c
> @@ -40,6 +40,7 @@
>  
>  #include <linux/io.h>
>  #include <linux/pm_runtime.h>

> +#include <linux/bits.h>

Probably this can be still ordered.

>  /* Assume max number of ACC stages */
>  #define MAX_ACC_STAGES	20
> @@ -1913,11 +1914,11 @@ void atomisp_css_input_set_mode(struct atomisp_sub_device *asd,
>  			    &asd->stream_env[ATOMISP_INPUT_STREAM_GENERAL].stream_config;
>  		s_config->mode = IA_CSS_INPUT_MODE_TPG;
>  		s_config->source.tpg.mode = IA_CSS_TPG_MODE_CHECKERBOARD;
> -		s_config->source.tpg.x_mask = (1 << 4) - 1;
> +		s_config->source.tpg.x_mask = GENMASK(3, 0);
>  		s_config->source.tpg.x_delta = -2;
> -		s_config->source.tpg.y_mask = (1 << 4) - 1;
> +		s_config->source.tpg.y_mask = GENMASK(3, 0);
>  		s_config->source.tpg.y_delta = 3;
> -		s_config->source.tpg.xy_mask = (1 << 8) - 1;
> +		s_config->source.tpg.xy_mask = GENMASK(7, 0);
>  		return;
>  	}
>  
> -- 
> 2.30.2
> 

-- 
With Best Regards,
Andy Shevchenko