linux-kernel - Re: [PATCH v3] staging: sm750fb: Improved code readability

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Date:   Tue, 14 Mar 2017 17:15:29 +0800
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Arushi Singhal <arushisinghal19971997@...il.com>
Cc:     w.d.hubbs@...il.com, devel@...verdev.osuosl.org, kirk@...sers.ca,
        speakup@...ux-speakup.org, linux-kernel@...r.kernel.org,
        outreachy-kernel@...glegroups.com, samuel.thibault@...-lyon.org,
        chris@...-brannons.com
Subject: Re: [PATCH v3] staging: sm750fb: Improved code readability

On Tue, Mar 14, 2017 at 02:36:26PM +0530, Arushi Singhal wrote:
> New variables are added to make the code more readable.
> 
> Signed-off-by: Arushi Singhal <arushisinghal19971997@...il.com>
> ---
>  changes in v3
>  - improve the patch to make code much more readable.
> 
>  drivers/staging/sm750fb/ddk750_mode.c | 115 ++++++++++++++++++----------------
>  1 file changed, 61 insertions(+), 54 deletions(-)
> 
> diff --git a/drivers/staging/sm750fb/ddk750_mode.c b/drivers/staging/sm750fb/ddk750_mode.c
> index 25da678179f7..150e5ed0d8ea 100644
> --- a/drivers/staging/sm750fb/ddk750_mode.c
> +++ b/drivers/staging/sm750fb/ddk750_mode.c
> @@ -81,33 +81,34 @@ static int programModeRegisters(struct _mode_parameter_t *pModeParam, struct pll
>  	if (pll->clockType == SECONDARY_PLL) {
>  		/* programe secondary pixel clock */
>  		poke32(CRT_PLL_CTRL, sm750_format_pll_reg(pll));
> -		poke32(CRT_HORIZONTAL_TOTAL,
> -		       (((pModeParam->horizontal_total - 1) <<
> -			 CRT_HORIZONTAL_TOTAL_TOTAL_SHIFT) &
> -			CRT_HORIZONTAL_TOTAL_TOTAL_MASK) |
> -		       ((pModeParam->horizontal_display_end - 1) &
> -			CRT_HORIZONTAL_TOTAL_DISPLAY_END_MASK));
> -
> -		poke32(CRT_HORIZONTAL_SYNC,
> -		       ((pModeParam->horizontal_sync_width <<
> -			 CRT_HORIZONTAL_SYNC_WIDTH_SHIFT) &
> -			CRT_HORIZONTAL_SYNC_WIDTH_MASK) |
> -		       ((pModeParam->horizontal_sync_start - 1) &
> -			CRT_HORIZONTAL_SYNC_START_MASK));
> -
> -		poke32(CRT_VERTICAL_TOTAL,
> -		       (((pModeParam->vertical_total - 1) <<
> -			 CRT_VERTICAL_TOTAL_TOTAL_SHIFT) &
> -			CRT_VERTICAL_TOTAL_TOTAL_MASK) |
> -		       ((pModeParam->vertical_display_end - 1) &
> -			CRT_VERTICAL_TOTAL_DISPLAY_END_MASK));
> -
> -		poke32(CRT_VERTICAL_SYNC,
> -		       ((pModeParam->vertical_sync_height <<
> -			 CRT_VERTICAL_SYNC_HEIGHT_SHIFT) &
> -			CRT_VERTICAL_SYNC_HEIGHT_MASK) |
> -		       ((pModeParam->vertical_sync_start - 1) &
> -			CRT_VERTICAL_SYNC_START_MASK));
> +
> +		unsigned int cht = CRT_HORIZONTAL_TOTAL;
> +		unsigned int chttm = CRT_HORIZONTAL_TOTAL_TOTAL_MASK;
> +		unsigned int phde = pModeParam->horizontal_display_end - 1;
> +		unsigned int chtdem = CRT_HORIZONTAL_TOTAL_DISPLAY_END_MASK;
> +
> +		poke32(cht, (((pModeParam->horizontal_total - 1) << CRT_HORIZONTAL_TOTAL_TOTAL_SHIFT) & chttm) | (phde & chtdem));
> +
> +		unsigned int chs = CRT_HORIZONTAL_SYNC;
> +		unsigned int chswm = CRT_HORIZONTAL_SYNC_WIDTH_MASK;
> +		unsigned int phss = pModeParam->horizontal_sync_start - 1;
> +		unsigned int chssm = CRT_HORIZONTAL_SYNC_START_MASK;
> +
> +		poke32(chs, ((pModeParam->horizontal_sync_width << CRT_HORIZONTAL_SYNC_WIDTH_SHIFT) & chswm) | (phss & chssm));

{sigh}

Ok, please, ALWAYS do the following for your patches:
	- run checkpatch.pl and do not introduce new issues
	- test build your code and do not add new build warnings.

Don't get sloppy here, you know better than this :)

thanks,

greg k-h