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| author | Eric Millbrandt <emillbrandt@dekaresearch.com> | 2010-08-06 20:49:18 -0600 |
|---|---|---|
| committer | Grant Likely <grant.likely@secretlab.ca> | 2010-08-06 20:49:18 -0600 |
| commit | cfa6a88c83f639f17b96a34dc0bf93faf432e73a (patch) | |
| tree | 4ca244d40929bac84b30f1c684253d9b5eb06630 /arch/powerpc/include/asm/mpc52xx_psc.h | |
| parent | 17879857821adad4e180c5d6457c3b8bbf1d0c0c (diff) | |
| download | blackbird-op-linux-cfa6a88c83f639f17b96a34dc0bf93faf432e73a.tar.gz blackbird-op-linux-cfa6a88c83f639f17b96a34dc0bf93faf432e73a.zip | |
powerpc/5200: add mpc5200_psc_ac97_gpio_reset
Work around a silicon bug in the ac97 reset functionality of the
mpc5200(b). The implementation of the ac97 "cold" reset is flawed.
If the sync and output lines are high when reset is asserted the
attached ac97 device may go into test mode. Avoid this by
reconfiguring the psc to gpio mode and generating the reset manually.
From MPC5200B User's Manual:
"Some AC97 devices goes to a test mode, if the Sync line is high
during the Res line is low (reset phase). To avoid this behavior the
Sync line must be also forced to zero during the reset phase. To do
that, the pin muxing should switch to GPIO mode and the GPIO control
register should be used to control the output lines."
Signed-off-by: Eric Millbrandt <emillbrandt@dekaresearch.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'arch/powerpc/include/asm/mpc52xx_psc.h')
| -rw-r--r-- | arch/powerpc/include/asm/mpc52xx_psc.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/mpc52xx_psc.h b/arch/powerpc/include/asm/mpc52xx_psc.h index ecc4fc69ac13..2966df604221 100644 --- a/arch/powerpc/include/asm/mpc52xx_psc.h +++ b/arch/powerpc/include/asm/mpc52xx_psc.h @@ -131,6 +131,7 @@ #define MPC52xx_PSC_SICR_SIM_FIR (0x6 << 24) #define MPC52xx_PSC_SICR_SIM_CODEC_24 (0x7 << 24) #define MPC52xx_PSC_SICR_SIM_CODEC_32 (0xf << 24) +#define MPC52xx_PSC_SICR_ACRB (0x8 << 24) #define MPC52xx_PSC_SICR_AWR (1 << 30) #define MPC52xx_PSC_SICR_GENCLK (1 << 23) #define MPC52xx_PSC_SICR_I2S (1 << 22) |
