linux-kernel - Re: [PATCH 2/2] drm/vc4: Add support for interlaced modes on HDMI.

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Date:   Thu, 29 Sep 2016 10:36:04 +0800
From:   Mark yao <mark.yao@...k-chips.com>
To:     Eric Anholt <eric@...olt.net>, dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drm/vc4: Add support for interlaced modes on HDMI.

On 2016年09月29日 10:20, Eric Anholt wrote:
> We just needed to initialize a few more fields.
>
> Signed-off-by: Eric Anholt <eric@...olt.net>
> ---
>   drivers/gpu/drm/vc4/vc4_crtc.c | 17 ++++++++++++++---
>   drivers/gpu/drm/vc4/vc4_hdmi.c | 12 ++++++++----
>   drivers/gpu/drm/vc4/vc4_regs.h |  3 +++
>   3 files changed, 25 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_crtc.c b/drivers/gpu/drm/vc4/vc4_crtc.c
> index 8fc2b731b59a..d575f8aa3273 100644
> --- a/drivers/gpu/drm/vc4/vc4_crtc.c
> +++ b/drivers/gpu/drm/vc4/vc4_crtc.c
> @@ -428,13 +428,24 @@ static void vc4_crtc_mode_set_nofb(struct drm_crtc *crtc)
>   			   VC4_SET_FIELD(mode->vsync_start - mode->vdisplay,
>   					 PV_VERTB_VFP) |
>   			   VC4_SET_FIELD(vactive, PV_VERTB_VACTIVE));
> +
> +		/* We set up first field even mode for HDMI.  VEC's
> +		 * NTSC mode would want first field odd instead, once
> +		 * we support it (to do so, set ODD_FIRST and put the
> +		 * delay in VSYNCD_EVEN instead).
> +		 */
> +		CRTC_WRITE(PV_V_CONTROL,
> +			   PV_VCONTROL_CONTINUOUS |
> +			   PV_VCONTROL_INTERLACE |
> +			   VC4_SET_FIELD(mode->htotal / 2,
> +					 PV_VCONTROL_ODD_DELAY));
> +		CRTC_WRITE(PV_VSYNCD_EVEN, 0);
> +	} else {
> +		CRTC_WRITE(PV_V_CONTROL, PV_VCONTROL_CONTINUOUS);
>   	}
>   
>   	CRTC_WRITE(PV_HACT_ACT, mode->hdisplay);
>   
> -	CRTC_WRITE(PV_V_CONTROL,
> -		   PV_VCONTROL_CONTINUOUS |
> -		   (interlace ? PV_VCONTROL_INTERLACE : 0));
>   
>   	CRTC_WRITE(PV_CONTROL,
>   		   VC4_SET_FIELD(format, PV_CONTROL_FORMAT) |
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 5770d6704f4b..6095e48fcf46 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -246,7 +246,7 @@ static struct drm_connector *vc4_hdmi_connector_init(struct drm_device *dev,
>   	connector->polled = (DRM_CONNECTOR_POLL_CONNECT |
>   			     DRM_CONNECTOR_POLL_DISCONNECT);
>   
> -	connector->interlace_allowed = 0;
> +	connector->interlace_allowed = true;
>   	connector->doublescan_allowed = 0;
>   
>   	drm_mode_connector_attach_encoder(connector, encoder);
> @@ -278,8 +278,8 @@ static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
>   	bool debug_dump_regs = false;
>   	bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
>   	bool vsync_pos = mode->flags & DRM_MODE_FLAG_PVSYNC;
> -	u32 vactive = (mode->vdisplay >>
> -		       ((mode->flags & DRM_MODE_FLAG_INTERLACE) ? 1 : 0));
> +	bool interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE;
> +	u32 vactive = mode->vdisplay >> interlaced;

How about use mode->crtc_vdisplay:

see this:
drm_mode_set_crtcinfo()

     if (p->flags & DRM_MODE_FLAG_INTERLACE) {
         if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
             p->crtc_vdisplay /= 2;
             p->crtc_vsync_start /= 2;
             p->crtc_vsync_end /= 2;
             p->crtc_vtotal /= 2;
         }
     }

Thanks

>   	u32 verta = (VC4_SET_FIELD(mode->vsync_end - mode->vsync_start,
>   				   VC4_HDMI_VERTA_VSP) |
>   		     VC4_SET_FIELD(mode->vsync_start - mode->vdisplay,
> @@ -288,6 +288,10 @@ static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
>   	u32 vertb = (VC4_SET_FIELD(0, VC4_HDMI_VERTB_VSPO) |
>   		     VC4_SET_FIELD(mode->vtotal - mode->vsync_end,
>   				   VC4_HDMI_VERTB_VBP));
> +	u32 vertb_even = (VC4_SET_FIELD(0, VC4_HDMI_VERTB_VSPO) |
> +			  VC4_SET_FIELD(mode->vtotal - mode->vsync_end -
> +					interlaced,
> +					VC4_HDMI_VERTB_VBP));
>   
>   	if (debug_dump_regs) {
>   		DRM_INFO("HDMI regs before:\n");
> @@ -319,7 +323,7 @@ static void vc4_hdmi_encoder_mode_set(struct drm_encoder *encoder,
>   	HDMI_WRITE(VC4_HDMI_VERTA0, verta);
>   	HDMI_WRITE(VC4_HDMI_VERTA1, verta);
>   
> -	HDMI_WRITE(VC4_HDMI_VERTB0, vertb);
> +	HDMI_WRITE(VC4_HDMI_VERTB0, vertb_even);
>   	HDMI_WRITE(VC4_HDMI_VERTB1, vertb);
>   
>   	HD_WRITE(VC4_HD_VID_CTL,
> diff --git a/drivers/gpu/drm/vc4/vc4_regs.h b/drivers/gpu/drm/vc4/vc4_regs.h
> index 160942a9180e..fec7b5ef058b 100644
> --- a/drivers/gpu/drm/vc4/vc4_regs.h
> +++ b/drivers/gpu/drm/vc4/vc4_regs.h
> @@ -183,6 +183,9 @@
>   # define PV_CONTROL_EN				BIT(0)
>   
>   #define PV_V_CONTROL				0x04
> +# define PV_VCONTROL_ODD_DELAY_MASK		VC4_MASK(22, 6)
> +# define PV_VCONTROL_ODD_DELAY_SHIFT		6
> +# define PV_VCONTROL_ODD_FIRST			BIT(5)
>   # define PV_VCONTROL_INTERLACE			BIT(4)
>   # define PV_VCONTROL_CONTINUOUS			BIT(1)
>   # define PV_VCONTROL_VIDEN			BIT(0)


-- 
Ｍark Yao