| Message ID | 20201026185239.379417-2-peron.clem@gmail.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | Add Allwinner H3/H5/H6/A64 HDMI audio | expand |
On Mon, Oct 26, 2020 at 07:52:26PM +0100, 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 set or not. > > This is not done actually and will trigger a bug. > For example, if we set to the simple soundcard in the device-tree > dai-tdm-slot-width = <32> and then 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. > > To fix this, we need to check if these values are set or not but as > this logic is already done by the caller. Avoid duplicating this > logic and just pass the required values as params to set_chan_cfg(). > > Suggested-by: Samuel Holland <samuel@sholland.org> > Signed-off-by: Clément Péron <peron.clem@gmail.com> > --- > sound/soc/sunxi/sun4i-i2s.c | 33 ++++++++++++++++++--------------- > 1 file changed, 18 insertions(+), 15 deletions(-) > > diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c > index f23ff29e7c1d..6c10f810b114 100644 > --- a/sound/soc/sunxi/sun4i-i2s.c > +++ b/sound/soc/sunxi/sun4i-i2s.c > @@ -162,8 +162,9 @@ 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); > int (*set_fmt)(const struct sun4i_i2s *, unsigned int); > }; > > @@ -399,10 +400,9 @@ 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); > @@ -419,15 +419,11 @@ 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); > @@ -452,11 +448,11 @@ 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: > @@ -480,9 +476,16 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream, > { > struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai); > unsigned int word_size = params_width(params); > - unsigned int slot_width = params_physical_width(params); > unsigned int channels = params_channels(params); > + > + /* > + * Here and in set_chan_cfg(), "slots" means channels per frame + > + * padding slots, regardless of format. "slot_width" means bits > + * per sample + padding bits, regardless of format. > + */ > unsigned int slots = channels; > + unsigned int slot_width = params_physical_width(params); > + what I meant was to put that comment next to the function pointer in the structure sun4i_i2s_quirks, it would be fairly easy to miss here. With that fixed, Acked-by: Maxime Ripard <mripard@kernel.org> Maxime
diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c index f23ff29e7c1d..6c10f810b114 100644 --- a/sound/soc/sunxi/sun4i-i2s.c +++ b/sound/soc/sunxi/sun4i-i2s.c @@ -162,8 +162,9 @@ 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); int (*set_fmt)(const struct sun4i_i2s *, unsigned int); }; @@ -399,10 +400,9 @@ 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); @@ -419,15 +419,11 @@ 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); @@ -452,11 +448,11 @@ 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: @@ -480,9 +476,16 @@ static int sun4i_i2s_hw_params(struct snd_pcm_substream *substream, { struct sun4i_i2s *i2s = snd_soc_dai_get_drvdata(dai); unsigned int word_size = params_width(params); - unsigned int slot_width = params_physical_width(params); unsigned int channels = params_channels(params); + + /* + * Here and in set_chan_cfg(), "slots" means channels per frame + + * padding slots, regardless of format. "slot_width" means bits + * per sample + padding bits, regardless of format. + */ unsigned int slots = channels; + unsigned int slot_width = params_physical_width(params); + int ret, sr, wss; u32 width; @@ -492,7 +495,7 @@ 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); if (ret < 0) { dev_err(dai->dev, "Invalid channel configuration\n"); return ret;
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 set or not. This is not done actually and will trigger a bug. For example, if we set to the simple soundcard in the device-tree dai-tdm-slot-width = <32> and then 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. To fix this, we need to check if these values are set or not but as this logic is already done by the caller. Avoid duplicating this logic and just pass the required values as params to set_chan_cfg(). Suggested-by: Samuel Holland <samuel@sholland.org> Signed-off-by: Clément Péron <peron.clem@gmail.com> --- sound/soc/sunxi/sun4i-i2s.c | 33 ++++++++++++++++++--------------- 1 file changed, 18 insertions(+), 15 deletions(-)