| Message ID | 1400520638-6907-1-git-send-email-s.nawrocki@samsung.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
On 05/19/2014 11:00 PM, Sylwester Nawrocki wrote: > This patch adds support for setting source clock of the "Core CLK" > of the IIS Multi Audio Interface. > > Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> > --- > sound/soc/samsung/i2s.c | 4 ++++ > sound/soc/samsung/i2s.h | 1 + > 2 files changed, 5 insertions(+) > > diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c > index 048ead9..ae02811 100644 > --- a/sound/soc/samsung/i2s.c > +++ b/sound/soc/samsung/i2s.c > @@ -451,6 +451,10 @@ static int i2s_set_sysclk(struct snd_soc_dai *dai, > u32 mod = readl(i2s->addr + I2SMOD); > > switch (clk_id) { > + case SAMSUNG_I2S_OPCLK: > + mod &= ~MOD_OPCLK_MASK; > + mod |= dir; I am assuming here that dir is one of SND_SOC_CLOCK_IN or SND_SOC_CLOCK_OUT. In that case, you need to take care of offset (30). Also the value of this bit-field doesn't match with SND_SOC_CLOCK_XXX macros. Bit-field (2'b): 00 Codec Clock out 01 Codec Clock in 10 Bit clock out 11 Audio bus clock Value of macros: SND_SOC_CLOCK_IN 0 SND_SOC_CLOCK_OUT 1 In the manual, this field is suggested to be Audio bus clock always. Is there an use-case where we might need to update this? The default value for audio playback right now is 00 (2'b), which needs to be fixed anyways.
On 20/05/14 07:14, Tushar Behera wrote: > On 05/19/2014 11:00 PM, Sylwester Nawrocki wrote: >> This patch adds support for setting source clock of the "Core CLK" >> of the IIS Multi Audio Interface. >> >> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> >> --- >> sound/soc/samsung/i2s.c | 4 ++++ >> sound/soc/samsung/i2s.h | 1 + >> 2 files changed, 5 insertions(+) >> >> diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c >> index 048ead9..ae02811 100644 >> --- a/sound/soc/samsung/i2s.c >> +++ b/sound/soc/samsung/i2s.c >> @@ -451,6 +451,10 @@ static int i2s_set_sysclk(struct snd_soc_dai *dai, >> u32 mod = readl(i2s->addr + I2SMOD); >> >> switch (clk_id) { >> + case SAMSUNG_I2S_OPCLK: >> + mod &= ~MOD_OPCLK_MASK; >> + mod |= dir; > > I am assuming here that dir is one of SND_SOC_CLOCK_IN or > SND_SOC_CLOCK_OUT. In that case, you need to take care of offset (30). And that's not a correct assumption. I also got similarly confused when first seeing this in our downstream kernels. 'dir' is supposed to be one of the MOD_OPCLK_* constants, as defined in sound/soc/samsung/i2s-regs.h. #define MOD_OPCLK_CDCLK_OUT (0 << 30) #define MOD_OPCLK_CDCLK_IN (1 << 30) #define MOD_OPCLK_BCLK_OUT (2 << 30) #define MOD_OPCLK_PCLK (3 << 30) #define MOD_OPCLK_MASK (3 << 30) So the clock is reconfigured with calls like: snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_OPCLK, 0, MOD_OPCLK_PCLK); > Also the value of this bit-field doesn't match with SND_SOC_CLOCK_XXX > macros. > > Bit-field (2'b): > 00 Codec Clock out > 01 Codec Clock in > 10 Bit clock out > 11 Audio bus clock > > Value of macros: > SND_SOC_CLOCK_IN 0 > SND_SOC_CLOCK_OUT 1 > In the manual, this field is suggested to be Audio bus clock always. Is > there an use-case where we might need to update this? I've checked couple boards and AFAICS we're always setting MOD_OPCLK_PCLK, however it's still different from the default value after reset - MOD_OPCLK_CDCLK_OUT. So how do you think this should be addressed ? Isn't it better to give options to the machine drivers to alter these clock settings, rather than hard coding it in the I2S driver ? Let's not forget it covers multiple Samsung SoC series. > The default value for audio playback right now is 00 (2'b), which needs > to be fixed anyways. -- Regards, Sylwester
On 05/20/2014 02:40 PM, Sylwester Nawrocki wrote: > On 20/05/14 07:14, Tushar Behera wrote: >> On 05/19/2014 11:00 PM, Sylwester Nawrocki wrote: >>> This patch adds support for setting source clock of the "Core CLK" >>> of the IIS Multi Audio Interface. >>> >>> Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> >>> --- >>> sound/soc/samsung/i2s.c | 4 ++++ >>> sound/soc/samsung/i2s.h | 1 + >>> 2 files changed, 5 insertions(+) >>> >>> diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c >>> index 048ead9..ae02811 100644 >>> --- a/sound/soc/samsung/i2s.c >>> +++ b/sound/soc/samsung/i2s.c >>> @@ -451,6 +451,10 @@ static int i2s_set_sysclk(struct snd_soc_dai *dai, >>> u32 mod = readl(i2s->addr + I2SMOD); >>> >>> switch (clk_id) { >>> + case SAMSUNG_I2S_OPCLK: >>> + mod &= ~MOD_OPCLK_MASK; >>> + mod |= dir; >> >> I am assuming here that dir is one of SND_SOC_CLOCK_IN or >> SND_SOC_CLOCK_OUT. In that case, you need to take care of offset (30). > > And that's not a correct assumption. I also got similarly confused when > first seeing this in our downstream kernels. 'dir' is supposed to be one > of the MOD_OPCLK_* constants, as defined in sound/soc/samsung/i2s-regs.h. > > #define MOD_OPCLK_CDCLK_OUT (0 << 30) > #define MOD_OPCLK_CDCLK_IN (1 << 30) > #define MOD_OPCLK_BCLK_OUT (2 << 30) > #define MOD_OPCLK_PCLK (3 << 30) > #define MOD_OPCLK_MASK (3 << 30) > > So the clock is reconfigured with calls like: > snd_soc_dai_set_sysclk(cpu_dai, SAMSUNG_I2S_OPCLK, 0, MOD_OPCLK_PCLK); > Ok. >> Also the value of this bit-field doesn't match with SND_SOC_CLOCK_XXX >> macros. >> >> Bit-field (2'b): >> 00 Codec Clock out >> 01 Codec Clock in >> 10 Bit clock out >> 11 Audio bus clock >> >> Value of macros: >> SND_SOC_CLOCK_IN 0 >> SND_SOC_CLOCK_OUT 1 > >> In the manual, this field is suggested to be Audio bus clock always. Is >> there an use-case where we might need to update this? > > I've checked couple boards and AFAICS we're always setting MOD_OPCLK_PCLK, > however it's still different from the default value after reset - > MOD_OPCLK_CDCLK_OUT. > So how do you think this should be addressed ? Isn't it better to give > options to the machine drivers to alter these clock settings, rather than > hard coding it in the I2S driver ? Let's not forget it covers multiple > Samsung SoC series. > I don't have any objection to this patch. Just that, I could not find any use-case where we would not like to set the value as MOD_OPCLK_PCLK. >> The default value for audio playback right now is 00 (2'b), which needs >> to be fixed anyways. > > -- > Regards, > Sylwester >
On Tue, May 20, 2014 at 11:10:08AM +0200, Sylwester Nawrocki wrote: > So how do you think this should be addressed ? Isn't it better to give > options to the machine drivers to alter these clock settings, rather than > hard coding it in the I2S driver ? Let's not forget it covers multiple > Samsung SoC series. Yes, it's better to make it controllable - ideally this could be moved into the clock API but for ASoC level stuff set_sysclk() with a sensible default is how it's supposed to be done.
On Mon, May 19, 2014 at 07:30:38PM +0200, Sylwester Nawrocki wrote: > This patch adds support for setting source clock of the "Core CLK" > of the IIS Multi Audio Interface. Applied, thanks.
diff --git a/sound/soc/samsung/i2s.c b/sound/soc/samsung/i2s.c index 048ead9..ae02811 100644 --- a/sound/soc/samsung/i2s.c +++ b/sound/soc/samsung/i2s.c @@ -451,6 +451,10 @@ static int i2s_set_sysclk(struct snd_soc_dai *dai, u32 mod = readl(i2s->addr + I2SMOD); switch (clk_id) { + case SAMSUNG_I2S_OPCLK: + mod &= ~MOD_OPCLK_MASK; + mod |= dir; + break; case SAMSUNG_I2S_CDCLK: /* Shouldn't matter in GATING(CLOCK_IN) mode */ if (dir == SND_SOC_CLOCK_IN) diff --git a/sound/soc/samsung/i2s.h b/sound/soc/samsung/i2s.h index 7966afc..21ff24e 100644 --- a/sound/soc/samsung/i2s.h +++ b/sound/soc/samsung/i2s.h @@ -18,5 +18,6 @@ #define SAMSUNG_I2S_RCLKSRC_0 0 #define SAMSUNG_I2S_RCLKSRC_1 1 #define SAMSUNG_I2S_CDCLK 2 +#define SAMSUNG_I2S_OPCLK 3 #endif /* __SND_SOC_SAMSUNG_I2S_H */
This patch adds support for setting source clock of the "Core CLK" of the IIS Multi Audio Interface. Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com> --- sound/soc/samsung/i2s.c | 4 ++++ sound/soc/samsung/i2s.h | 1 + 2 files changed, 5 insertions(+)