OMAP: DSS2: make filter coefficient tables human readable

Reorganize scaler FIR filter data as FIR value tables from raw
register values. This makes them easier to understand and simplifies
register programming code.

No functional changes.
Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

drivers/video/omap2/dss/dispc.c

@@ -139,6 +139,22 @@ struct omap_dispc_isr_data {
 	u32			mask;
 };
 
+struct dispc_h_coef {
+	s8 hc4;
+	s8 hc3;
+	u8 hc2;
+	s8 hc1;
+	s8 hc0;
+};
+
+struct dispc_v_coef {
+	s8 vc22;
+	s8 vc2;
+	u8 vc1;
+	s8 vc0;
+	s8 vc00;
+};
+
 #define REG_GET(idx, start, end) \
 	FLD_GET(dispc_read_reg(idx), start, end)
 
@@ -564,106 +580,77 @@ static void _dispc_set_scale_coef(enum omap_plane plane, int hscaleup,
 		int vscaleup, int five_taps)
 {
 	/* Coefficients for horizontal up-sampling */
-	static const u32 coef_hup[8] = {
-		0x00800000,
-		0x0D7CF800,
-		0x1E70F5FF,
-		0x335FF5FE,
-		0xF74949F7,
-		0xF55F33FB,
-		0xF5701EFE,
-		0xF87C0DFF,
+	static const struct dispc_h_coef coef_hup[8] = {
+		{  0,   0, 128,   0,  0 },
+		{ -1,  13, 124,  -8,  0 },
+		{ -2,  30, 112, -11, -1 },
+		{ -5,  51,  95, -11, -2 },
+		{  0,  -9,  73,  73, -9 },
+		{ -2, -11,  95,  51, -5 },
+		{ -1, -11, 112,  30, -2 },
+		{  0,  -8, 124,  13, -1 },
 	};
 
-	/* Coefficients for horizontal down-sampling */
-	static const u32 coef_hdown[8] = {
-		0x24382400,
-		0x28371FFE,
-		0x2C361BFB,
-		0x303516F9,
-		0x11343311,
-		0x1635300C,
-		0x1B362C08,
-		0x1F372804,
+	/* Coefficients for vertical up-sampling */
+	static const struct dispc_v_coef coef_vup_3tap[8] = {
+		{ 0,  0, 128,  0, 0 },
+		{ 0,  3, 123,  2, 0 },
+		{ 0, 12, 111,  5, 0 },
+		{ 0, 32,  89,  7, 0 },
+		{ 0,  0,  64, 64, 0 },
+		{ 0,  7,  89, 32, 0 },
+		{ 0,  5, 111, 12, 0 },
+		{ 0,  2, 123,  3, 0 },
 	};
 
-	/* Coefficients for horizontal and vertical up-sampling */
-	static const u32 coef_hvup[2][8] = {
-		{
-		0x00800000,
-		0x037B02FF,
-		0x0C6F05FE,
-		0x205907FB,
-		0x00404000,
-		0x075920FE,
-		0x056F0CFF,
-		0x027B0300,
-		},
-		{
-		0x00800000,
-		0x0D7CF8FF,
-		0x1E70F5FE,
-		0x335FF5FB,
-		0xF7404000,
-		0xF55F33FE,
-		0xF5701EFF,
-		0xF87C0D00,
-		},
+	static const struct dispc_v_coef coef_vup_5tap[8] = {
+		{  0,   0, 128,   0,  0 },
+		{ -1,  13, 124,  -8,  0 },
+		{ -2,  30, 112, -11, -1 },
+		{ -5,  51,  95, -11, -2 },
+		{  0,  -9,  73,  73, -9 },
+		{ -2, -11,  95,  51, -5 },
+		{ -1, -11, 112,  30, -2 },
+		{  0,  -8, 124,  13, -1 },
 	};
 
-	/* Coefficients for horizontal and vertical down-sampling */
-	static const u32 coef_hvdown[2][8] = {
-		{
-		0x24382400,
-		0x28391F04,
-		0x2D381B08,
-		0x3237170C,
-		0x123737F7,
-		0x173732F9,
-		0x1B382DFB,
-		0x1F3928FE,
-		},
-		{
-		0x24382400,
-		0x28371F04,
-		0x2C361B08,
-		0x3035160C,
-		0x113433F7,
-		0x163530F9,
-		0x1B362CFB,
-		0x1F3728FE,
-		},
+	/* Coefficients for horizontal down-sampling */
+	static const struct dispc_h_coef coef_hdown[8] = {
+		{   0, 36, 56, 36,  0 },
+		{   4, 40, 55, 31, -2 },
+		{   8, 44, 54, 27, -5 },
+		{  12, 48, 53, 22, -7 },
+		{  -9, 17, 52, 51, 17 },
+		{  -7, 22, 53, 48, 12 },
+		{  -5, 27, 54, 44,  8 },
+		{  -2, 31, 55, 40,  4 },
 	};
 
-	/* Coefficients for vertical up-sampling */
-	static const u32 coef_vup[8] = {
-		0x00000000,
-		0x0000FF00,
-		0x0000FEFF,
-		0x0000FBFE,
-		0x000000F7,
-		0x0000FEFB,
-		0x0000FFFE,
-		0x000000FF,
+	/* Coefficients for vertical down-sampling */
+	static const struct dispc_v_coef coef_vdown_3tap[8] = {
+		{ 0, 36, 56, 36, 0 },
+		{ 0, 40, 57, 31, 0 },
+		{ 0, 45, 56, 27, 0 },
+		{ 0, 50, 55, 23, 0 },
+		{ 0, 18, 55, 55, 0 },
+		{ 0, 23, 55, 50, 0 },
+		{ 0, 27, 56, 45, 0 },
+		{ 0, 31, 57, 40, 0 },
 	};
 
-
-	/* Coefficients for vertical down-sampling */
-	static const u32 coef_vdown[8] = {
-		0x00000000,
-		0x000004FE,
-		0x000008FB,
-		0x00000CF9,
-		0x0000F711,
-		0x0000F90C,
-		0x0000FB08,
-		0x0000FE04,
+	static const struct dispc_v_coef coef_vdown_5tap[8] = {
+		{   0, 36, 56, 36,  0 },
+		{   4, 40, 55, 31, -2 },
+		{   8, 44, 54, 27, -5 },
+		{  12, 48, 53, 22, -7 },
+		{  -9, 17, 52, 51, 17 },
+		{  -7, 22, 53, 48, 12 },
+		{  -5, 27, 54, 44,  8 },
+		{  -2, 31, 55, 40,  4 },
 	};
 
-	const u32 *h_coef;
-	const u32 *hv_coef;
-	const u32 *hv_coef_mod;
-	const u32 *v_coef;
+	const struct dispc_h_coef *h_coef;
+	const struct dispc_v_coef *v_coef;
 	int i;
 
 	if (hscaleup)
@@ -671,47 +658,34 @@ static void _dispc_set_scale_coef(enum omap_plane plane, int hscaleup,
 	else
 		h_coef = coef_hdown;
 
-	if (vscaleup) {
-		hv_coef = coef_hvup[five_taps];
-		v_coef = coef_vup;
-
-		if (hscaleup)
-			hv_coef_mod = NULL;
-		else
-			hv_coef_mod = coef_hvdown[five_taps];
-	} else {
-		hv_coef = coef_hvdown[five_taps];
-		v_coef = coef_vdown;
-
-		if (hscaleup)
-			hv_coef_mod = coef_hvup[five_taps];
-		else
-			hv_coef_mod = NULL;
-	}
+	if (vscaleup)
+		v_coef = five_taps ? coef_vup_5tap : coef_vup_3tap;
+	else
+		v_coef = five_taps ? coef_vdown_5tap : coef_vdown_3tap;
 
 	for (i = 0; i < 8; i++) {
 		u32 h, hv;
 
-		h = h_coef[i];
-
-		hv = hv_coef[i];
-
-		if (hv_coef_mod) {
-			hv &= 0xffffff00;
-			hv |= (hv_coef_mod[i] & 0xff);
-		}
+		h = FLD_VAL(h_coef[i].hc0, 7, 0)
+			| FLD_VAL(h_coef[i].hc1, 15, 8)
+			| FLD_VAL(h_coef[i].hc2, 23, 16)
+			| FLD_VAL(h_coef[i].hc3, 31, 24);
+		hv = FLD_VAL(h_coef[i].hc4, 7, 0)
+			| FLD_VAL(v_coef[i].vc0, 15, 8)
+			| FLD_VAL(v_coef[i].vc1, 23, 16)
+			| FLD_VAL(v_coef[i].vc2, 31, 24);
 
 		_dispc_write_firh_reg(plane, i, h);
 		_dispc_write_firhv_reg(plane, i, hv);
 	}
 
-	if (!five_taps)
-		return;
-
-	for (i = 0; i < 8; i++) {
-		u32 v;
-		v = v_coef[i];
-		_dispc_write_firv_reg(plane, i, v);
+	if (five_taps) {
+		for (i = 0; i < 8; i++) {
+			u32 v;
+			v = FLD_VAL(v_coef[i].vc00, 7, 0)
+				| FLD_VAL(v_coef[i].vc22, 15, 8);
+			_dispc_write_firv_reg(plane, i, v);
+		}
 	}
 }