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OMAPDSS: DISPC: Fix FIR coefficients 

coef3_M8 had an incorrect phase with 50% more intensity. This resulted in
banding on slightly down/upscaled images. Fixed a rounding error in coef5_M9.

Also removed ARRAY_LEN macro as ARRAY_SIZE is the standard linux one.

Signed-off-by: Lajos Molnar <lajos@ti.com>
Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Lajos Molnar 2012-02-21 19:36:31 +05:30 committed by Tomi Valkeinen
parent 08f3267e26
commit c0c1cfcb57
1 changed files with 4 additions and 5 deletions
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9
drivers/video/omap2/dss/dispc_coefs.c
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@ -19,14 +19,13 @@
#include <linux/kernel.h>
#include <video/omapdss.h>
#include "dispc.h"
#define ARRAY_LEN(array) (sizeof(array) / sizeof(array[0]))
#include "dispc.h"
static const struct dispc_coef coef3_M8[8] = {
{ 0, 0, 128, 0, 0 },
{ 0, -4, 123, 9, 0 },
{ 0, -4, 108, 87, 0 },
{ 0, -4, 108, 24, 0 },
{ 0, -2, 87, 43, 0 },
{ 0, 64, 64, 0, 0 },
{ 0, 43, 87, -2, 0 },
@ -168,7 +167,7 @@ static const struct dispc_coef coef5_M8[8] = {
static const struct dispc_coef coef5_M9[8] = {
{ -3, 10, 114, 10, -3 },
{ -6, 24, 110, 0, -1 },
{ -6, 24, 111, 0, -1 },
{ -8, 40, 103, -7, 0 },
{ -11, 58, 91, -11, 1 },
{ 0, -12, 76, 76, -12 },
@ -319,7 +318,7 @@ const struct dispc_coef *dispc_ovl_get_scale_coef(int inc, int five_taps)
};
inc /= 128;
for (i = 0; i < ARRAY_LEN(coefs); ++i)
for (i = 0; i < ARRAY_SIZE(coefs); ++i)
if (inc >= coefs[i].Mmin && inc <= coefs[i].Mmax)
return five_taps ? coefs[i].coef_5 : coefs[i].coef_3;
return NULL;