video: tegra: dc: only set supported filters

Not all windows are created equal, only set vertical or horizontal
filters when the window supports them.

Bug 850852

Original-Change-Id: I69b40ff47fd8ed8499857408c249ddd35299ae95
Reviewed-on: http://git-master/r/40132
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>

Rebase-Id: R339412d8ca44cd3bbe69f4af8c9bdde32a6d56c7

1 files changed, 9 insertions, 2 deletions

diff --git a/drivers/video/tegra/dc/dc.c b/drivers/video/tegra/dc/dc.c
index 847689303..cd038ca70 100644
--- a/drivers/video/tegra/dc/dc.c
+++ b/drivers/video/tegra/dc/dc.c
@@ -811,8 +811,6 @@ int tegra_dc_update_windows(struct tegra_dc_win *windows[], int n)
                 return -EFAULT;
         }
 
-        tegra_dc_set_dynamic_emc(windows, n);
-
         if (no_vsync)
                 tegra_dc_writel(dc, WRITE_MUX_ACTIVE | READ_MUX_ACTIVE, DC_CMD_STATE_ACCESS);
         else
@@ -926,6 +924,13 @@ int tegra_dc_update_windows(struct tegra_dc_win *windows[], int n)
                 else if (tegra_dc_fmt_bpp(win->fmt) < 24)
                         val |= COLOR_EXPAND;
 
+                /* only B and C have H filer, force it on if scaling */
+                if (win->idx != 0 && win->w != win->out_w)
+                        win->flags |= TEGRA_WIN_FLAG_H_FILTER;
+                /* only B has V filter, set it if scaling */
+                if (win->idx == 1 && win->h != win->out_h)
+                        win->flags |= TEGRA_WIN_FLAG_V_FILTER;
+
                 if (WIN_USE_H_FILTER(win))
                         val |= H_FILTER_ENABLE;
                 if (WIN_USE_V_FILTER(win))
@@ -950,6 +955,8 @@ int tegra_dc_update_windows(struct tegra_dc_win *windows[], int n)
                 }
         }
 
+        tegra_dc_set_dynamic_emc(windows, n);
+
         tegra_dc_writel(dc, update_mask << 8, DC_CMD_STATE_CONTROL);
 
         if (!no_vsync) {