linux-kernel - Re: [PATCH 04/13] drm/kms/mode/fsl-dcu: using helper func drm_display_mode_to_videomode for calculating timing parameters

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Date:   Mon, 07 May 2018 22:46:49 +0200
From:   Stefan Agner <stefan@...er.ch>
To:     Satendra Singh Thakur <satendra.t@...sung.com>
Cc:     Alison Wang <alison.wang@...escale.com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Madhur Verma <madhur.verma@...sung.com>,
        Hemanshu Srivastava <hemanshu.s@...sung.com>
Subject: Re: [PATCH 04/13] drm/kms/mode/fsl-dcu: using helper func
 drm_display_mode_to_videomode for calculating timing parameters

On 03.05.2018 10:44, Satendra Singh Thakur wrote:
> To avoid duplicate logic for the same

How about:

Use drm_display_mode_to_videomode to avoid duplicate logic.


> 
> Signed-off-by: Satendra Singh Thakur <satendra.t@...sung.com>
> Cc: Madhur Verma <madhur.verma@...sung.com>
> Cc: Hemanshu Srivastava <hemanshu.s@...sung.com>
> ---
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c | 29 ++++++++++++-----------------
>  1 file changed, 12 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
> b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
> index 0e37524..3c651f8 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
> @@ -17,6 +17,7 @@
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_crtc_helper.h>
> +#include <video/videomode.h>

I don't think this is needed here.

But probably drm/drm_modes.h is, since that is where
drm_display_mode_to_videomode is declared...

>  
>  #include "fsl_dcu_drm_crtc.h"
>  #include "fsl_dcu_drm_drv.h"
> @@ -85,19 +86,13 @@ static void fsl_dcu_drm_crtc_mode_set_nofb(struct
> drm_crtc *crtc)
>  	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
>  	struct drm_connector *con = &fsl_dev->connector.base;
>  	struct drm_display_mode *mode = &crtc->state->mode;
> -	unsigned int hbp, hfp, hsw, vbp, vfp, vsw, index, pol = 0;
> +	unsigned int  index, pol = 0;

Remove space between int and index.

> +	struct videomode vm;
>  
>  	index = drm_crtc_index(crtc);
> -	clk_set_rate(fsl_dev->pix_clk, mode->clock * 1000);
> -
> -	/* Configure timings: */
> -	hbp = mode->htotal - mode->hsync_end;
> -	hfp = mode->hsync_start - mode->hdisplay;
> -	hsw = mode->hsync_end - mode->hsync_start;
> -	vbp = mode->vtotal - mode->vsync_end;
> -	vfp = mode->vsync_start - mode->vdisplay;
> -	vsw = mode->vsync_end - mode->vsync_start;
> -
> +	/* Configure timings:*/

Drop that comment, it is not really helpful.

> +	drm_display_mode_to_videomode(mode, &vm);
> +	clk_set_rate(fsl_dev->pix_clk, vm.pixelclock);

Add newline here.


I like the patch! Thanks!

--
Stefan

>  	/* INV_PXCK as default (most display sample data on rising edge) */
>  	if (!(con->display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_POSEDGE))
>  		pol |= DCU_SYN_POL_INV_PXCK;
> @@ -109,13 +104,13 @@ static void
> fsl_dcu_drm_crtc_mode_set_nofb(struct drm_crtc *crtc)
>  		pol |= DCU_SYN_POL_INV_VS_LOW;
>  
>  	regmap_write(fsl_dev->regmap, DCU_HSYN_PARA,
> -		     DCU_HSYN_PARA_BP(hbp) |
> -		     DCU_HSYN_PARA_PW(hsw) |
> -		     DCU_HSYN_PARA_FP(hfp));
> +		     DCU_HSYN_PARA_BP(vm.hback_porch) |
> +		     DCU_HSYN_PARA_PW(vm.hsync_len) |
> +		     DCU_HSYN_PARA_FP(vm.hfront_porch));
>  	regmap_write(fsl_dev->regmap, DCU_VSYN_PARA,
> -		     DCU_VSYN_PARA_BP(vbp) |
> -		     DCU_VSYN_PARA_PW(vsw) |
> -		     DCU_VSYN_PARA_FP(vfp));
> +		     DCU_VSYN_PARA_BP(vm.vback_porch) |
> +		     DCU_VSYN_PARA_PW(vm.vsync_len) |
> +		     DCU_VSYN_PARA_FP(vm.vfront_porch));
>  	regmap_write(fsl_dev->regmap, DCU_DISP_SIZE,
>  		     DCU_DISP_SIZE_DELTA_Y(mode->vdisplay) |
>  		     DCU_DISP_SIZE_DELTA_X(mode->hdisplay));