Staging: echo: remove unneeded USE_MMX defines

This define is never set in the kernel, so remove the code
using it.  This lets us drop the mmx.h file as well.

Cc: David Rowe <david@rowetel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/echo/fir.h

@@ -62,10 +62,6 @@
    can.
 */
 
-#if defined(USE_MMX)  ||  defined(USE_SSE2)
-#include "mmx.h"
-#endif
-
 /*!
     16 bit integer FIR descriptor. This defines the working state for a single
     instance of an FIR filter using 16 bit integer coefficients.
@@ -106,7 +102,7 @@ static inline const int16_t *fir16_create(struct fir16_state_t *fir,
 	fir->taps = taps;
 	fir->curr_pos = taps - 1;
 	fir->coeffs = coeffs;
-#if defined(USE_MMX)  ||  defined(USE_SSE2) || defined(__bfin__)
+#if defined(USE_SSE2) || defined(__bfin__)
 	fir->history = kcalloc(2 * taps, sizeof(int16_t), GFP_KERNEL);
 #else
 	fir->history = kcalloc(taps, sizeof(int16_t), GFP_KERNEL);
@@ -116,7 +112,7 @@ static inline const int16_t *fir16_create(struct fir16_state_t *fir,
 
 static inline void fir16_flush(struct fir16_state_t *fir)
 {
-#if defined(USE_MMX)  ||  defined(USE_SSE2) || defined(__bfin__)
+#if defined(USE_SSE2) || defined(__bfin__)
 	memset(fir->history, 0, 2 * fir->taps * sizeof(int16_t));
 #else
 	memset(fir->history, 0, fir->taps * sizeof(int16_t));
@@ -158,38 +154,7 @@ static inline int32_t dot_asm(short *x, short *y, int len)
 static inline int16_t fir16(struct fir16_state_t *fir, int16_t sample)
 {
 	int32_t y;
-#if defined(USE_MMX)
-	int i;
-	union mmx_t *mmx_coeffs;
-	union mmx_t *mmx_hist;
-
-	fir->history[fir->curr_pos] = sample;
-	fir->history[fir->curr_pos + fir->taps] = sample;
-
-	mmx_coeffs = (union mmx_t *)fir->coeffs;
-	mmx_hist = (union mmx_t *)&fir->history[fir->curr_pos];
-	i = fir->taps;
-	pxor_r2r(mm4, mm4);
-	/* 8 samples per iteration, so the filter must be a multiple of 8 long. */
-	while (i > 0) {
-		movq_m2r(mmx_coeffs[0], mm0);
-		movq_m2r(mmx_coeffs[1], mm2);
-		movq_m2r(mmx_hist[0], mm1);
-		movq_m2r(mmx_hist[1], mm3);
-		mmx_coeffs += 2;
-		mmx_hist += 2;
-		pmaddwd_r2r(mm1, mm0);
-		pmaddwd_r2r(mm3, mm2);
-		paddd_r2r(mm0, mm4);
-		paddd_r2r(mm2, mm4);
-		i -= 8;
-	}
-	movq_r2r(mm4, mm0);
-	psrlq_i2r(32, mm0);
-	paddd_r2r(mm0, mm4);
-	movd_r2m(mm4, y);
-	emms();
-#elif defined(USE_SSE2)
+#if defined(USE_SSE2)
 	int i;
 	union xmm_t *xmm_coeffs;
 	union xmm_t *xmm_hist;