linux-kernel - Re: [PATCH 7/7] drm/fsl-dcu: use mode flags for hsync/vsync pixelclk polarity

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Date:	Wed, 27 Jan 2016 18:46:50 -0800
From:	Stefan Agner <stefan@...er.ch>
To:	airlied@...il.com, thierry.reding@...il.com
Cc:	alison.wang@...escale.com, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, airlied@...ux.ie,
	daniel.vetter@...ll.ch, jianwei.wang.chn@...il.com,
	Shawn Guo <shawnguo@...nel.org>
Subject: Re: [PATCH 7/7] drm/fsl-dcu: use mode flags for hsync/vsync pixelclk
 polarity

Hi Dave, Hi Thierry,

Not sure how to handle this patch: it contains a little change in
panel-simple.c. I think this should be in one patch, since it changes
the associated logic in the driver... Can I send that through my tree?

--
Stefan

On 2015-11-18 18:42, Stefan Agner wrote:
> The current default configuration is as follows:
> - Display samples data on the falling edge
> - Invert VSYNC signal (active LOW)
> - Invert HSYNC signal (active LOW)
> 
> The mode flags allow to specify the required polarity per
> display. Furthermore, none of the current driver settings is
> actually a standard polarity.
> 
> This patch applies the current driver standard 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 defaults (e.g.
> if no flags are specified):
> - Display samples data on the rising edge
> - VSYNC signal not inverted (active HIGH)
> - HSYNC signal not inverted (active HIGH)
> 
> Signed-off-by: Stefan Agner <stefan@...er.ch>
> ---
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c | 16 +++++++++++++---
>  drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h  |  4 ++--
>  drivers/gpu/drm/panel/panel-simple.c       |  2 ++
>  3 files changed, 17 insertions(+), 5 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 b2f56e4..db69725 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_crtc.c
> @@ -18,6 +18,8 @@
>  #include <drm/drm_crtc.h>
>  #include <drm/drm_crtc_helper.h>
>  
> +#include <video/display_timing.h>
> +
>  #include "fsl_dcu_drm_crtc.h"
>  #include "fsl_dcu_drm_drv.h"
>  #include "fsl_dcu_drm_plane.h"
> @@ -74,7 +76,7 @@ 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 +91,15 @@ 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 & DISPLAY_FLAGS_PIXDATA_POSEDGE))
> +		pol |= DCU_SYN_POL_INV_PXCK_FALL;
> +
> +	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> +		pol |= DCU_SYN_POL_INV_HS_LOW;
> +
> +	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
> +		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 +112,7 @@ 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/fsl-dcu/fsl_dcu_drm_drv.h
> b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
> index 6413ac9..2a724f3 100644
> --- a/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
> +++ b/drivers/gpu/drm/fsl-dcu/fsl_dcu_drm_drv.h
> @@ -47,8 +47,8 @@
>  #define DCU_VSYN_PARA_FP(x)		(x)
>  
>  #define DCU_SYN_POL			0x0024
> -#define DCU_SYN_POL_INV_PXCK_FALL	(0 << 6)
> -#define DCU_SYN_POL_NEG_REMAIN		(0 << 5)
> +#define DCU_SYN_POL_INV_PXCK_FALL	BIT(6)
> +#define DCU_SYN_POL_NEG_REMAIN		BIT(5)
>  #define DCU_SYN_POL_INV_VS_LOW		BIT(1)
>  #define DCU_SYN_POL_INV_HS_LOW		BIT(0)
>  
> diff --git a/drivers/gpu/drm/panel/panel-simple.c
> b/drivers/gpu/drm/panel/panel-simple.c
> index f97b73e..fa68b56 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -960,6 +960,8 @@ 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 |
> +		 DISPLAY_FLAGS_PIXDATA_POSEDGE,
>  };
>  
>  static const struct panel_desc nec_nl4827hc19_05b = {