3 files changed, 54 insertions, 20 deletions

diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c
index 78e51d953629..a5ec7f37c185 100644
--- a/drivers/video/omap2/dss/dispc.c
+++ b/drivers/video/omap2/dss/dispc.c
@@ -1614,6 +1614,9 @@ static unsigned long calc_fclk_five_taps(enum omap_channel channel, u16 width,
         u32 fclk = 0;
         u64 tmp, pclk = dispc_mgr_pclk_rate(channel);
 
+        if (height <= out_height && width <= out_width)
+                return (unsigned long) pclk;
+
         if (height > out_height) {
                 struct omap_dss_device *dssdev = dispc_mgr_get_device(channel);
                 unsigned int ppl = dssdev->panel.timings.x_res;
@@ -1668,7 +1671,16 @@ static unsigned long calc_fclk(enum omap_channel channel, u16 width,
         else
                 vf = 1;
 
-        return dispc_mgr_pclk_rate(channel) * vf * hf;
+        if (cpu_is_omap24xx()) {
+                if (vf > 1 && hf > 1)
+                        return dispc_mgr_pclk_rate(channel) * 4;
+                else
+                        return dispc_mgr_pclk_rate(channel) * 2;
+        } else if (cpu_is_omap34xx()) {
+                return dispc_mgr_pclk_rate(channel) * vf * hf;
+        } else {
+                return dispc_mgr_pclk_rate(channel) * hf;
+        }
 }
 
 static int dispc_ovl_calc_scaling(enum omap_plane plane,
@@ -1678,6 +1690,8 @@ static int dispc_ovl_calc_scaling(enum omap_plane plane,
 {
         struct omap_overlay *ovl = omap_dss_get_overlay(plane);
         const int maxdownscale = dss_feat_get_param_max(FEAT_PARAM_DOWNSCALE);
+        const int maxsinglelinewidth =
+                                dss_feat_get_param_max(FEAT_PARAM_LINEWIDTH);
         unsigned long fclk = 0;
 
         if (width == out_width && height == out_height)
@@ -1694,28 +1708,40 @@ static int dispc_ovl_calc_scaling(enum omap_plane plane,
                         out_height > height * 8)
                 return -EINVAL;
 
-        /* Must use 5-tap filter? */
-        *five_taps = height > out_height * 2;
-
-        if (!*five_taps) {
+        if (cpu_is_omap24xx()) {
+                if (width > maxsinglelinewidth)
+                        DSSERR("Cannot scale max input width exceeded");
+                *five_taps = false;
+                fclk = calc_fclk(channel, width, height, out_width,
+                                                                out_height);
+        } else if (cpu_is_omap34xx()) {
+                if (width > (maxsinglelinewidth * 2)) {
+                        DSSERR("Cannot setup scaling");
+                        DSSERR("width exceeds maximum width possible");
+                        return -EINVAL;
+                }
+                fclk = calc_fclk_five_taps(channel, width, height, out_width,
+                                                out_height, color_mode);
+                if (width > maxsinglelinewidth) {
+                        if (height > out_height && height < out_height * 2)
+                                *five_taps = false;
+                        else {
+                                DSSERR("cannot setup scaling with five taps");
+                                return -EINVAL;
+                        }
+                }
+                if (!*five_taps)
+                        fclk = calc_fclk(channel, width, height, out_width,
+                                        out_height);
+        } else {
+                if (width > maxsinglelinewidth) {
+                        DSSERR("Cannot scale width exceeds max line width");
+                        return -EINVAL;
+                }
                 fclk = calc_fclk(channel, width, height, out_width,
                                 out_height);
-
-                /* Try 5-tap filter if 3-tap fclk is too high */
-                if (cpu_is_omap34xx() && height > out_height &&
-                                fclk > dispc_fclk_rate())
-                        *five_taps = true;
         }
 
-        if (width > (2048 >> *five_taps)) {
-                DSSERR("failed to set up scaling, fclk too low\n");
-                return -EINVAL;
-        }
-
-        if (*five_taps)
-                fclk = calc_fclk_five_taps(channel, width, height,
-                                out_width, out_height, color_mode);
-
         DSSDBG("required fclk rate = %lu Hz\n", fclk);
         DSSDBG("current fclk rate = %lu Hz\n", dispc_fclk_rate());
 
@@ -1734,7 +1760,7 @@ int dispc_ovl_setup(enum omap_plane plane, struct omap_overlay_info *oi,
                 bool ilace, bool replication)
 {
         struct omap_overlay *ovl = omap_dss_get_overlay(plane);
-        bool five_taps = false;
+        bool five_taps = true;
         bool fieldmode = 0;
         int r, cconv = 0;
         unsigned offset0, offset1;
diff --git a/drivers/video/omap2/dss/dss_features.c b/drivers/video/omap2/dss/dss_features.c
index b402699168a5..5e4b829605da 100644
--- a/drivers/video/omap2/dss/dss_features.c
+++ b/drivers/video/omap2/dss/dss_features.c
@@ -304,6 +304,11 @@ static const struct dss_param_range omap2_dss_param_range[] = {
         [FEAT_PARAM_DSIPLL_FINT]                = { 0, 0 },
         [FEAT_PARAM_DSIPLL_LPDIV]               = { 0, 0 },
         [FEAT_PARAM_DOWNSCALE]                  = { 1, 2 },
+        /*
+         * Assuming the line width buffer to be 768 pixels as OMAP2 DISPC
+         * scaler cannot scale a image with width more than 768.
+         */
+        [FEAT_PARAM_LINEWIDTH]                  = { 1, 768 },
 };
 
 static const struct dss_param_range omap3_dss_param_range[] = {
@@ -316,6 +321,7 @@ static const struct dss_param_range omap3_dss_param_range[] = {
         [FEAT_PARAM_DSIPLL_FINT]                = { 750000, 2100000 },
         [FEAT_PARAM_DSIPLL_LPDIV]               = { 1, (1 << 13) - 1},
         [FEAT_PARAM_DOWNSCALE]                  = { 1, 4 },
+        [FEAT_PARAM_LINEWIDTH]                  = { 1, 1024 },
 };
 
 static const struct dss_param_range omap4_dss_param_range[] = {
@@ -328,6 +334,7 @@ static const struct dss_param_range omap4_dss_param_range[] = {
         [FEAT_PARAM_DSIPLL_FINT]                = { 500000, 2500000 },
         [FEAT_PARAM_DSIPLL_LPDIV]               = { 0, (1 << 13) - 1 },
         [FEAT_PARAM_DOWNSCALE]                  = { 1, 4 },
+        [FEAT_PARAM_LINEWIDTH]                  = { 1, 2048 },
 };
 
 /* OMAP2 DSS Features */
diff --git a/drivers/video/omap2/dss/dss_features.h b/drivers/video/omap2/dss/dss_features.h
index 6a6c05dd45ce..cd833bbaac3d 100644
--- a/drivers/video/omap2/dss/dss_features.h
+++ b/drivers/video/omap2/dss/dss_features.h
@@ -86,6 +86,7 @@ enum dss_range_param {
         FEAT_PARAM_DSIPLL_FINT,
         FEAT_PARAM_DSIPLL_LPDIV,
         FEAT_PARAM_DOWNSCALE,
+        FEAT_PARAM_LINEWIDTH,
 };
 
 /* DSS Feature Functions */