From: Mans Rullgard <mans@mansr.com>
Date: Fri, 29 Aug 2008 01:45:26 +0000 (+0100)
Subject: OMAP: Enable overlay optimisation
X-Git-Url: http://git.mansr.com/?p=linux-omap;a=commitdiff_plain;h=7e052af7e4c73dc450412486ad37eb529e725dc7

OMAP: Enable overlay optimisation

This enables the overlay optimisation feature when the video
overlay is active. This reduces memory bandwidth used by the
display subsystem, improving overall performance.

Signed-off-by: Mans Rullgard <mans@mansr.com>
---

diff --git a/drivers/video/omap/dispc.c b/drivers/video/omap/dispc.c
index 888d2c2..0f0b2e5 100644
--- a/drivers/video/omap/dispc.c
+++ b/drivers/video/omap/dispc.c
@@ -315,6 +315,60 @@ void omap_dispc_enable_digit_out(int enable)
 }
 EXPORT_SYMBOL(omap_dispc_enable_digit_out);
 
+#define MIN(a, b) ((a)<(b)?(a):(b))
+#define MAX(a, b) ((a)>(b)?(a):(b))
+
+static void setup_overlay_opt(void)
+{
+	struct fb_info **fbi = dispc.fbdev->fb_info;
+	struct omapfb_plane_struct *gfx, *vid;
+	struct fb_var_screeninfo *gvar;
+	unsigned gx, gx2, gy, gy2, gw, gh;
+	unsigned vx, vx2, vy, vy2, vw, vh;
+	unsigned bpp, skip;
+	static unsigned last_skip;
+
+	if (!fbi[0] || !fbi[1])
+		return;
+
+	gfx = fbi[0]->par;
+	vid = fbi[1]->par;
+	gvar = &fbi[0]->var;
+
+	gx = gfx->info.pos_x;
+	gy = gfx->info.pos_y;
+	gw = gfx->info.out_width;
+	gh = gfx->info.out_height;
+	vx = vid->info.pos_x;
+	vy = vid->info.pos_y;
+	vw = vid->info.out_width;
+	vh = vid->info.out_height;
+	gx2 = gx + gw;
+	gy2 = gy + gh;
+	vx2 = vx + vw;
+	vy2 = vy + vh;
+	bpp = gvar->bits_per_pixel / 8;
+
+	if (!gfx->info.enabled || !vid->info.enabled ||
+	    dispc.color_key.key_type != OMAPFB_COLOR_KEY_DISABLED) {
+		skip = 0;
+	} else if (vx <= gx && vx2 >= gx2) {
+		unsigned y = MIN(gy2, vy2) - MAX(gy, vy);
+		skip = y * gvar->xres_virtual * bpp;
+	} else if (vx <= gx || vx2 >= gx2) {
+		unsigned x = MIN(gx2, vx2) - MAX(gx, vx);
+		skip = x * bpp;
+	} else {
+		skip = vw * bpp + 1;
+	}
+
+	if (skip != last_skip) {
+		last_skip = skip;
+		dispc_write_reg(DISPC_GFX_WINDOW_SKIP, skip);
+		MOD_REG_FLD(DISPC_CONTROL, 1<<12, !!skip<<12);
+	}
+}
+
 static inline int _setup_plane(int plane, int channel_out,
 				  u32 paddr, int screen_width,
 				  int pos_x, int pos_y, int width, int height,
@@ -437,6 +491,9 @@ static inline int _setup_plane(int plane, int channel_out,
 
 	dispc_write_reg(ri_reg[plane], (screen_width - width) * bpp / 8 + 1);
 
+	if (plane < 2)
+		setup_overlay_opt();
+
 	MOD_REG_FLD(DISPC_CONTROL, 1<<5, 1<<5);
 
 	return height * screen_width * bpp / 8;
@@ -585,11 +642,19 @@ static int omap_dispc_enable_plane(int plane, int enable)
 	const u32 at_reg[] = { DISPC_GFX_ATTRIBUTES,
 				DISPC_VID1_BASE + DISPC_VID_ATTRIBUTES,
 				DISPC_VID2_BASE + DISPC_VID_ATTRIBUTES };
+	struct omapfb_plane_struct *pi;
+
 	if ((unsigned int)plane > dispc.mem_desc.region_cnt)
 		return -EINVAL;
 
+	pi = dispc.fbdev->fb_info[plane]->par;
+	pi->info.enabled = enable;
+
 	enable_lcd_clocks(1);
 	MOD_REG_FLD(at_reg[plane], 1, enable ? 1 : 0);
+	if (plane < 2)
+		setup_overlay_opt();
+	MOD_REG_FLD(DISPC_CONTROL, 1<<5, 1<<5);
 	enable_lcd_clocks(0);
 
 	return 0;
@@ -633,6 +698,7 @@ static int omap_dispc_set_color_key(struct omapfb_color_key *ck)
 	if (val != 0)
 		dispc_write_reg(tr_reg, ck->trans_key);
 	dispc_write_reg(df_reg, ck->background);
+	setup_overlay_opt();
 	enable_lcd_clocks(0);
 
 	dispc.color_key = *ck;