From: Misael Lopez Cruz misael.lopez@ti.com

The default state when serializers are in inactive slots is Hi-Z. In some cases, there are no additional components driving the data lines to a safe state so they might have noise.

While in inactive slots, the McASP AXR pins configured as outputs can be driven low through the serializer pin drive mode setting (DISMOD) to prevent such noise.

Signed-off-by: Misael Lopez Cruz misael.lopez@ti.com Signed-off-by: Peter Ujfalusi peter.ujfalusi@ti.com --- sound/soc/davinci/davinci-mcasp.c | 2 ++ sound/soc/davinci/davinci-mcasp.h | 5 ++++- 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/sound/soc/davinci/davinci-mcasp.c b/sound/soc/davinci/davinci-mcasp.c index d79349434a9a..26cbc213b8cf 100644 --- a/sound/soc/davinci/davinci-mcasp.c +++ b/sound/soc/davinci/davinci-mcasp.c @@ -686,6 +686,8 @@ static int mcasp_common_hw_param(struct davinci_mcasp *mcasp, int stream, if (mcasp->serial_dir[i] == TX_MODE && tx_ser < max_active_serializers) { mcasp_set_bits(mcasp, DAVINCI_MCASP_PDIR_REG, AXR(i)); + mcasp_mod_bits(mcasp, DAVINCI_MCASP_XRSRCTL_REG(i), + DISMOD_LOW, DISMOD_MASK); tx_ser++; } else if (mcasp->serial_dir[i] == RX_MODE && rx_ser < max_active_serializers) { diff --git a/sound/soc/davinci/davinci-mcasp.h b/sound/soc/davinci/davinci-mcasp.h index 79dc511180bf..a3be108a8c17 100644 --- a/sound/soc/davinci/davinci-mcasp.h +++ b/sound/soc/davinci/davinci-mcasp.h @@ -215,7 +215,10 @@ * DAVINCI_MCASP_XRSRCTL_BASE_REG - Serializer Control Register Bits */ #define MODE(val) (val) -#define DISMOD (val)(val<<2) +#define DISMOD_3STATE (0x0) +#define DISMOD_LOW (0x2 << 2) +#define DISMOD_HIGH (0x3 << 2) +#define DISMOD_MASK DISMOD_HIGH #define TXSTATE BIT(4) #define RXSTATE BIT(5) #define SRMOD_MASK 3