linux-kernel - Re: [PATCH v2 1/3] drm/fsl-dcu: use mode flags for hsync/vsync polarity

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Message-ID: <9c327372d92a3e608d65eb2b04df9617@agner.ch>
Date:	Thu, 25 Feb 2016 15:55:50 -0800
From:	Stefan Agner <stefan@...er.ch>
To:	dri-devel@...ts.freedesktop.org, thierry.reding@...il.com
Cc:	airlied@...ux.ie, daniel.vetter@...ll.ch,
	jianwei.wang.chn@...il.com, alison.wang@...escale.com,
	meng.yi@....com, linux@....linux.org.uk, p.zabel@...gutronix.de,
	denis@...rea.com, eric@...rea.com, ville.syrjala@...ux.intel.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] drm/fsl-dcu: use mode flags for hsync/vsync
 polarity

On 2016-02-08 13:57, Stefan Agner wrote:
> The current default configuration is as follows:
> - Invert VSYNC signal (active LOW)
> - Invert HSYNC signal (active LOW)
> 
> The mode flags allow to specify the required polarity per
> mode. Furthermore, none of the current driver settings is
> actually a standard polarity.
> 
> This patch applies the current driver default polarities as
> explicit flags to the display which has been introduced with
> the driver (NEC WQVGA "nec,nl4827hc19-05b"). The driver now
> also parses the flags field and applies the configuration
> accordingly, by using the following values as standard
> polarities: (e.g. when no flags are specified):
> - VSYNC signal not inverted (active HIGH)
> - HSYNC signal not inverted (active HIGH)
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>

Applied.

> ---
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c | 11 ++++++++---
>  drivers/gpu/drm/panel/panel-simple.c       |  1 +
>  2 files changed, 9 insertions(+), 3 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 62377e4..b36f815 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
> @@ -74,7 +74,7 @@ static void fsl_dcu_drm_crtc_mode_set_nofb(struct
> drm_crtc *crtc)
>  	struct drm_device *dev = crtc->dev;
>  	struct fsl_dcu_drm_device *fsl_dev = dev->dev_private;
>  	struct drm_display_mode *mode = &crtc->state->mode;
> -	unsigned int hbp, hfp, hsw, vbp, vfp, vsw, div, index;
> +	unsigned int hbp, hfp, hsw, vbp, vfp, vsw, div, index, pol = 0;
>  	unsigned long dcuclk;
>  
>  	index = drm_crtc_index(crtc);
> @@ -89,6 +89,12 @@ static void fsl_dcu_drm_crtc_mode_set_nofb(struct
> drm_crtc *crtc)
>  	vfp = mode->vsync_start - mode->vdisplay;
>  	vsw = mode->vsync_end - mode->vsync_start;
>  
> +	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> +		pol |= DCU_SYN_POL_INV_HS_LOW;
> +
> +	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
> +		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) |
> @@ -101,8 +107,7 @@ static void fsl_dcu_drm_crtc_mode_set_nofb(struct
> drm_crtc *crtc)
>  		     DCU_DISP_SIZE_DELTA_Y(mode->vdisplay) |
>  		     DCU_DISP_SIZE_DELTA_X(mode->hdisplay));
>  	regmap_write(fsl_dev->regmap, DCU_DIV_RATIO, div);
> -	regmap_write(fsl_dev->regmap, DCU_SYN_POL,
> -		     DCU_SYN_POL_INV_VS_LOW | DCU_SYN_POL_INV_HS_LOW);
> +	regmap_write(fsl_dev->regmap, DCU_SYN_POL, pol);
>  	regmap_write(fsl_dev->regmap, DCU_BGND, DCU_BGND_R(0) |
>  		     DCU_BGND_G(0) | DCU_BGND_B(0));
>  	regmap_write(fsl_dev->regmap, DCU_DCU_MODE,
> diff --git a/drivers/gpu/drm/panel/panel-simple.c
> b/drivers/gpu/drm/panel/panel-simple.c
> index f88a631..2164c99 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -1016,6 +1016,7 @@ static const struct drm_display_mode
> nec_nl4827hc19_05b_mode = {
>  	.vsync_end = 272 + 2 + 4,
>  	.vtotal = 272 + 2 + 4 + 2,
>  	.vrefresh = 74,
> +	.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
>  };
>  
>  static const struct panel_desc nec_nl4827hc19_05b = {