[PATCH] drm: tegra: fix front_porch <-> back_porch mixup

[PATCH] drm: tegra: fix front_porch <-> back_porch mixup

[Lucas Stach]

Fixes wrong picture offset observed when using HDMI output with a
Technisat HD TV.

Signed-off-by: Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
---
Captions are a bit confusing here. As the porch is always relative to
the sync pulse, the left picture margin is actually the back_porch.
---
 drivers/gpu/drm/tegra/dc.c   | 8 ++++----
 drivers/gpu/drm/tegra/hdmi.c | 6 +++---
 2 Dateien geändert, 7 Zeilen hinzugefügt(+), 7 Zeilen entfernt(-)

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 0744103..54683e4 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -102,12 +102,12 @@ static int tegra_dc_set_timings(struct tegra_dc *dc,
 		((mode->hsync_end - mode->hsync_start) <<  0);
 	tegra_dc_writel(dc, value, DC_DISP_SYNC_WIDTH);
 
-	value = ((mode->vsync_start - mode->vdisplay) << 16) |
-		((mode->hsync_start - mode->hdisplay) <<  0);
-	tegra_dc_writel(dc, value, DC_DISP_BACK_PORCH);
-
 	value = ((mode->vtotal - mode->vsync_end) << 16) |
 		((mode->htotal - mode->hsync_end) <<  0);
+	tegra_dc_writel(dc, value, DC_DISP_BACK_PORCH);
+
+	value = ((mode->vsync_start - mode->vdisplay) << 16) |
+		((mode->hsync_start - mode->hdisplay) <<  0);
 	tegra_dc_writel(dc, value, DC_DISP_FRONT_PORCH);
 
 	value = (mode->vdisplay << 16) | mode->hdisplay;
diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index ab40164..81ea934 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -479,7 +479,7 @@ static void tegra_hdmi_setup_avi_infoframe(struct tegra_hdmi *hdmi,
 		return;
 	}
 
-	h_front_porch = mode->htotal - mode->hsync_end;
+	h_front_porch = mode->hsync_start - mode->hdisplay;
 	memset(&frame, 0, sizeof(frame));
 	frame.r = HDMI_AVI_R_SAME;
 
@@ -634,8 +634,8 @@ static int tegra_output_hdmi_enable(struct tegra_output *output)
 
 	pclk = mode->clock * 1000;
 	h_sync_width = mode->hsync_end - mode->hsync_start;
-	h_front_porch = mode->htotal - mode->hsync_end;
-	h_back_porch = mode->hsync_start - mode->hdisplay;
+	h_back_porch = mode->htotal - mode->hsync_end;
+	h_front_porch = mode->hsync_start - mode->hdisplay;
 
 	err = regulator_enable(hdmi->vdd);
 	if (err < 0) {
-- 
1.7.11.7

Re: [PATCH] drm: tegra: fix front_porch <-> back_porch mixup

[Mark Zhang]

Acked-by: Mark Zhang <markz-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
Tested-by: Mark Zhang <markz-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

On my Tegra 30 cardhu. Thanks, Lucas.

Mark
On 12/12/2012 04:51 AM, Lucas Stach wrote:
> Fixes wrong picture offset observed when using HDMI output with a
> Technisat HD TV.
> 
> Signed-off-by: Lucas Stach <dev-8ppwABl0HbeELgA04lAiVw@public.gmane.org>
> ---
> Captions are a bit confusing here. As the porch is always relative to
> the sync pulse, the left picture margin is actually the back_porch.
> ---
>  drivers/gpu/drm/tegra/dc.c   | 8 ++++----
>  drivers/gpu/drm/tegra/hdmi.c | 6 +++---
>  2 Dateien geändert, 7 Zeilen hinzugefügt(+), 7 Zeilen entfernt(-)
> 
> diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
> index 0744103..54683e4 100644
> --- a/drivers/gpu/drm/tegra/dc.c
> +++ b/drivers/gpu/drm/tegra/dc.c
> @@ -102,12 +102,12 @@ static int tegra_dc_set_timings(struct tegra_dc *dc,
>  		((mode->hsync_end - mode->hsync_start) <<  0);
>  	tegra_dc_writel(dc, value, DC_DISP_SYNC_WIDTH);
>  
> -	value = ((mode->vsync_start - mode->vdisplay) << 16) |
> -		((mode->hsync_start - mode->hdisplay) <<  0);
> -	tegra_dc_writel(dc, value, DC_DISP_BACK_PORCH);
> -
>  	value = ((mode->vtotal - mode->vsync_end) << 16) |
>  		((mode->htotal - mode->hsync_end) <<  0);
> +	tegra_dc_writel(dc, value, DC_DISP_BACK_PORCH);
> +
> +	value = ((mode->vsync_start - mode->vdisplay) << 16) |
> +		((mode->hsync_start - mode->hdisplay) <<  0);
>  	tegra_dc_writel(dc, value, DC_DISP_FRONT_PORCH);
>  
>  	value = (mode->vdisplay << 16) | mode->hdisplay;
> diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
> index ab40164..81ea934 100644
> --- a/drivers/gpu/drm/tegra/hdmi.c
> +++ b/drivers/gpu/drm/tegra/hdmi.c
> @@ -479,7 +479,7 @@ static void tegra_hdmi_setup_avi_infoframe(struct tegra_hdmi *hdmi,
>  		return;
>  	}
>  
> -	h_front_porch = mode->htotal - mode->hsync_end;
> +	h_front_porch = mode->hsync_start - mode->hdisplay;
>  	memset(&frame, 0, sizeof(frame));
>  	frame.r = HDMI_AVI_R_SAME;
>  
> @@ -634,8 +634,8 @@ static int tegra_output_hdmi_enable(struct tegra_output *output)
>  
>  	pclk = mode->clock * 1000;
>  	h_sync_width = mode->hsync_end - mode->hsync_start;
> -	h_front_porch = mode->htotal - mode->hsync_end;
> -	h_back_porch = mode->hsync_start - mode->hdisplay;
> +	h_back_porch = mode->htotal - mode->hsync_end;
> +	h_front_porch = mode->hsync_start - mode->hdisplay;
>  
>  	err = regulator_enable(hdmi->vdd);
>  	if (err < 0) {
>