[Mesa-dev] [PATCH] wsi_common_display: Deal with vscan values

[Ville Syrjälä]

On Thu, Jun 14, 2018 at 05:57:01PM -0700, Keith Packard wrote:
> We sorted out what 'vscan' means and are trying to use it correctly.
> 
> vscan = 0 is the same as vscan = 1, which is slightly annoying; we use
> MAX2(vscan, 1) everywhere.
> 
> randr doesn't pass vscan at all, so we set wsi mode vscan = 0.
> 
> The doublescan flag doubles the vscan value, so we don't need to deal
> with that separately, we can just compare flags normally.
> 
> Signed-off-by: Keith Packard <keithp at keithp.com>
> ---
>  src/vulkan/wsi/wsi_common_display.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/src/vulkan/wsi/wsi_common_display.c b/src/vulkan/wsi/wsi_common_display.c
> index c7f794a0eff..de1c1826bd2 100644
> --- a/src/vulkan/wsi/wsi_common_display.c
> +++ b/src/vulkan/wsi/wsi_common_display.c
> @@ -149,7 +149,7 @@ wsi_display_mode_matches_drm(wsi_display_mode *wsi,
>        wsi->vsync_start == drm->vsync_start &&
>        wsi->vsync_end == drm->vsync_end &&
>        wsi->vtotal == drm->vtotal &&
> -      wsi->vscan == drm->vscan &&
> +      MAX2(wsi->vscan, 1) == MAX2(drm->vscan, 1) &&
>        wsi->flags == drm->flags;
>  }
>  
> @@ -158,7 +158,7 @@ wsi_display_mode_refresh(struct wsi_display_mode *wsi)
>  {
>     return (double) wsi->clock * 1000.0 / ((double) wsi->htotal *
>                                            (double) wsi->vtotal *
> -                                          (double) (wsi->vscan + 1));
> +                                          (double) MAX2(wsi->vscan, 1));

Are you dealing with INTERLACE anywhere? The kernel generally operates
under the assumption that vrefresh == field rate.

>  }
>  
>  static uint64_t wsi_get_current_monotonic(void)
> @@ -1657,6 +1657,7 @@ wsi_display_mode_matches_x(struct wsi_display_mode *wsi,
>        wsi->vsync_start == xcb->vsync_start &&
>        wsi->vsync_end == xcb->vsync_end &&
>        wsi->vtotal == xcb->vtotal &&
> +      wsi->vscan <= 1 && 
>        wsi->flags == xcb->mode_flags;
>  }
>  
> @@ -1707,8 +1708,6 @@ wsi_display_register_x_mode(struct wsi_device *wsi_device,
>     display_mode->vsync_end = x_mode->vsync_end;
>     display_mode->vtotal = x_mode->vtotal;
>     display_mode->vscan = 0;
> -   if (x_mode->mode_flags & XCB_RANDR_MODE_FLAG_DOUBLE_SCAN)
> -      display_mode->vscan = 1;
>     display_mode->flags = x_mode->mode_flags;
>  
>     list_addtail(&display_mode->list, &connector->display_modes);
> -- 
> 2.17.1
> 
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> dri-devel at lists.freedesktop.org
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-- 
Ville Syrjälä
Intel