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[ALSA] ASoC: sh: improve generated code for HAC module (AC97) 

Change loops in ac97_read/write functions to count down to zero
rather than up. Gcc will then use the 'dt' (decrement-and-test) op
instead of an increment/compare op-pair.

Signed-off-by: Manuel Lauss <mano@roarinelk.homelinux.net>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Manuel Lauss 2007-11-06 11:56:17 +01:00 committed by Jaroslav Kysela
parent e035b84101
commit 690eceb58c
1 changed files with 5 additions and 8 deletions
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13
sound/soc/sh/hac.c
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@ -105,7 +105,7 @@ static int hac_get_codec_data(struct hac_priv *hac, unsigned short r,
unsigned int to1, to2, i;
unsigned short adr;
for (i = 0; i < AC97_READ_RETRY; ++i) {
for (i = AC97_READ_RETRY; i; i--) {
*v = 0;
/* wait for HAC to receive something from the codec */
for (to1 = TMO_E4;
@ -132,7 +132,7 @@ static int hac_get_codec_data(struct hac_priv *hac, unsigned short r,
udelay(21);
}
HACREG(HACRSR) &= ~(RSR_STDRY | RSR_STARY);
return (i < AC97_READ_RETRY);
return i;
}
static unsigned short hac_read_codec_aux(struct hac_priv *hac,
@ -141,7 +141,7 @@ static unsigned short hac_read_codec_aux(struct hac_priv *hac,
unsigned short val;
unsigned int i, to;
for (i = 0; i < AC97_READ_RETRY; i++) {
for (i = AC97_READ_RETRY; i; i--) {
/* send_read_request */
local_irq_disable();
HACREG(HACTSR) &= ~(TSR_CMDAMT);
@ -159,10 +159,7 @@ static unsigned short hac_read_codec_aux(struct hac_priv *hac,
break;
}
if (i == AC97_READ_RETRY)
return ~0;
return val;
return i ? val : ~0;
}
static void hac_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
@ -172,7 +169,7 @@ static void hac_ac97_write(struct snd_ac97 *ac97, unsigned short reg,
struct hac_priv *hac = &hac_cpu_data[unit_id];
unsigned int i, to;
/* write_codec_aux */
for (i = 0; i < AC97_WRITE_RETRY; i++) {
for (i = AC97_WRITE_RETRY; i; i--) {
/* send_write_request */
local_irq_disable();
HACREG(HACTSR) &= ~(TSR_CMDDMT | TSR_CMDAMT);