diff options
| author | Eric Millbrandt <emillbrandt@dekaresearch.com> | 2010-09-03 17:27:38 (GMT) |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2010-09-08 17:55:26 (GMT) |
| commit | fa32154e47a203688453e53c1369fcbc63b06a21 (patch) | |
| tree | b9a95fe92d483efb45025eb36845bbe56c008b43 /arch/powerpc | |
| parent | 915b96191f01d53e30d74083dcf4aebfb5b7ce10 (diff) | |
| download | linux-fa32154e47a203688453e53c1369fcbc63b06a21.tar.xz | |
powerpc/5200: tighten up ac97 reset timing
Tighten up time timing around the gpio reset functionality. Add a 200ns
delay before remuxing the pins back to ac97 to comply with the ac97 spec.
Signed-off-by: Eric Millbrandt <emillbrandt@dekaresearch.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/platforms/52xx/mpc52xx_common.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/52xx/mpc52xx_common.c b/arch/powerpc/platforms/52xx/mpc52xx_common.c index 6e90531..41f3a7e 100644 --- a/arch/powerpc/platforms/52xx/mpc52xx_common.c +++ b/arch/powerpc/platforms/52xx/mpc52xx_common.c @@ -325,12 +325,16 @@ int mpc5200_psc_ac97_gpio_reset(int psc_number) clrbits32(&simple_gpio->simple_dvo, sync | out); clrbits8(&wkup_gpio->wkup_dvo, reset); - /* wait at lease 1 us */ - udelay(2); + /* wait for 1 us */ + udelay(1); /* Deassert reset */ setbits8(&wkup_gpio->wkup_dvo, reset); + /* wait at least 200ns */ + /* 7 ~= (200ns * timebase) / ns2sec */ + __delay(7); + /* Restore pin-muxing */ out_be32(&simple_gpio->port_config, mux); |