>From 22874e1b6db03fd42339f974fc5ea81190e7968d Mon Sep 17 00:00:00 2001
From: Manuel Lauss <mano@xxxxxxxxxxxxxxxxxxxxxxx>
Date: Mon, 5 Nov 2007 19:51:45 +0100
Subject: [PATCH] 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@xxxxxxxxxxxxxxxxxxxxxxx>
---
sound/soc/sh/hac.c | 13 +++++--------
1 files changed, 5 insertions(+), 8 deletions(-)
diff --git a/sound/soc/sh/hac.c b/sound/soc/sh/hac.c
index 8e3f039..34b77b9 100644
--- a/sound/soc/sh/hac.c
+++ b/sound/soc/sh/hac.c
@@ -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);
--
1.5.3.4
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