On Tue, Oct 06, 2020 at 12:03:14AM -0500, Samuel Holland wrote:
On 10/5/20 7:13 AM, Maxime Ripard wrote:
On Sat, Oct 03, 2020 at 04:19:38PM +0200, Clément Péron wrote:
As slots and slot_width can be set manually using set_tdm(). These values are then kept in sun4i_i2s struct. So we need to check if these values are setted or not in the struct.
Avoid to check for this logic in set_chan_cfg(). This will duplicate the same check instead pass the required values as params to set_chan_cfg().
This will also avoid a bug when we will enable 20/24bits support, i2s->slot_width is not actually used in the lrck_period computation.
Suggested-by: Samuel Holland samuel@sholland.org Signed-off-by: Clément Péron peron.clem@gmail.com
sound/soc/sunxi/sun4i-i2s.c | 36 ++++++++++++++---------------------- 1 file changed, 14 insertions(+), 22 deletions(-)
diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c index c5ccd423e6d3..1f577dbc20a6 100644 --- a/sound/soc/sunxi/sun4i-i2s.c +++ b/sound/soc/sunxi/sun4i-i2s.c @@ -177,8 +177,9 @@ struct sun4i_i2s_quirks { unsigned long (*get_bclk_parent_rate)(const struct sun4i_i2s *); s8 (*get_sr)(const struct sun4i_i2s *, int); s8 (*get_wss)(const struct sun4i_i2s *, int);
- int (*set_chan_cfg)(const struct sun4i_i2s *,
const struct snd_pcm_hw_params *);
- int (*set_chan_cfg)(const struct sun4i_i2s *i2s,
unsigned int channels, unsigned int slots,unsigned int slot_width);};
@@ -414,10 +415,9 @@ static s8 sun8i_i2s_get_sr_wss(const struct sun4i_i2s *i2s, int width) }
static int sun4i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
const struct snd_pcm_hw_params *params)
unsigned int channels, unsigned int slots,unsigned int slot_width){
- unsigned int channels = params_channels(params);
- /* Map the channels for playback and capture */ regmap_write(i2s->regmap, SUN4I_I2S_TX_CHAN_MAP_REG, 0x76543210); regmap_write(i2s->regmap, SUN4I_I2S_RX_CHAN_MAP_REG, 0x00003210);
@@ -434,15 +434,11 @@ static int sun4i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s, }
static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
const struct snd_pcm_hw_params *params)
unsigned int channels, unsigned int slots,unsigned int slot_width){
unsigned int channels = params_channels(params);
unsigned int slots = channels; unsigned int lrck_period;
if (i2s->slots)
slots = i2s->slots;/* Map the channels for playback and capture */ regmap_write(i2s->regmap, SUN8I_I2S_TX_CHAN_MAP_REG, 0x76543210); regmap_write(i2s->regmap, SUN8I_I2S_RX_CHAN_MAP_REG, 0x76543210);
@@ -467,11 +463,11 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s, case SND_SOC_DAIFMT_DSP_B: case SND_SOC_DAIFMT_LEFT_J: case SND_SOC_DAIFMT_RIGHT_J:
lrck_period = params_physical_width(params) * slots;
lrck_period = slot_width * slots;break;
case SND_SOC_DAIFMT_I2S:
lrck_period = params_physical_width(params);
lrck_period = slot_width;break;
default:
@@ -490,15 +486,11 @@ static int sun8i_i2s_set_chan_cfg(const struct sun4i_i2s *i2s, }
static int sun50i_h6_i2s_set_chan_cfg(const struct sun4i_i2s *i2s,
const struct snd_pcm_hw_params *params)
unsigned int channels, unsigned int slots,unsigned int slot_width){
unsigned int channels = params_channels(params);
unsigned int slots = channels; unsigned int lrck_period;
if (i2s->slots)
slots = i2s->slots;/* Map the channels for playback and capture */ regmap_write(i2s->regmap, SUN50I_H6_I2S_TX_CHAN_MAP0_REG, 0xFEDCBA98); regmap_write(i2s->regmap, SUN50I_H6_I2S_TX_CHAN_MAP1_REG, 0x76543210);
@@ -525,11 +517,11 @@ static int sun50i_h6_i2s_set_chan_cfg(const struct sun4i_i2s *i2s, case SND_SOC_DAIFMT_DSP_B: case SND_SOC_DAIFMT_LEFT_J: case SND_SOC_DAIFMT_RIGHT_J:
lrck_period = params_physical_width(params) * slots;
lrck_period = slot_width * slots;break;
case SND_SOC_DAIFMT_I2S:
lrck_period = params_physical_width(params);
lrck_period = slot_width;break;
default:
@@ -565,7 +557,7 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream, if (i2s->slot_width) slot_width = i2s->slot_width;
- ret = i2s->variant->set_chan_cfg(i2s, params);
- ret = i2s->variant->set_chan_cfg(i2s, channels, slots, slot_width);
Isn't slots and slot_width set to 0 here ?
And therefore, wouldn't we set lrck_period to 0 if we're using any format but I2S?
More importantly, I'm not really convinced this needs to be done, and it introduces some side effects that are not explained.
If I set dai-tdm-slot-width = <32> and start a stream using S16_LE, currently we would calculate BCLK for 32-bit slots, but program lrck_period for 16-bit slots, making the sample rate double what we expected. That sounds like a bug to me. (Because of that, as Chen-Yu mentioned in reply to v5, this should be the first patch in the series.)
I'm not denying that there's a bug though here :)
You've spent way more time than I did with this driver recently, so I definitely take your word for it.
Could you be more specific what side effects you are referring to?
I don't really like the change of semantics associated to the new prototype, and it becomes less obvious what we're supposed to do with slots and slot_width. Like, those are very TDM-y terms, are we supposed to honour them when running in I2S, or should we just ignore them?
Maxime