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Message-ID: <20201019102443.uk3t2jcqc7x7rxdi@gilmour.lan>
Date: Mon, 19 Oct 2020 12:24:43 +0200
From: Maxime Ripard <maxime@...no.tech>
To: Samuel Holland <samuel@...lland.org>
Cc: Clément Péron <peron.clem@...il.com>,
Chen-Yu Tsai <wens@...e.org>, Rob Herring <robh+dt@...nel.org>,
Mark Brown <broonie@...nel.org>,
Liam Girdwood <lgirdwood@...il.com>,
Jaroslav Kysela <perex@...ex.cz>,
Takashi Iwai <tiwai@...e.com>,
Marcus Cooper <codekipper@...il.com>,
Jernej Skrabec <jernej.skrabec@...l.net>,
Linux-ALSA <alsa-devel@...a-project.org>,
devicetree <devicetree@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-kernel <linux-kernel@...r.kernel.org>,
linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [PATCH v6 02/14] ASoC: sun4i-i2s: Change set_chan_cfg() params
Hi Samuel,
On Mon, Oct 12, 2020 at 08:15:30PM -0500, Samuel Holland wrote:
> On 10/12/20 7:15 AM, Maxime Ripard wrote:
> > Hi,
> >
> > On Mon, Oct 05, 2020 at 03:23:12PM +0200, Clément Péron wrote:
> >> On Mon, 5 Oct 2020 at 14:13, Maxime Ripard <maxime@...no.tech> 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@...lland.org>
> >>>> Signed-off-by: Clément Péron <peron.clem@...il.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);
> >>>> int (*set_fmt)(const struct sun4i_i2s *, unsigned int);
> >>>> };
> >>>>
> >>>> @@ -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 ?
> >>
> >> No, there is still a check before calling the set_cfg function.
> >>
> >> unsigned int slot_width = params_physical_width(params);
> >> unsigned int channels = params_channels(params);
> >> unsigned int slots = channels;
> >>
> >> if (i2s->slots)
> >> slots = i2s->slots;
> >>
> >> if (i2s->slot_width)
> >> slot_width = i2s->slot_width;
> >>
> >> ret = i2s->variant->set_chan_cfg(i2s, channels, slots, slot_width);
> >>
> >> So slot_width will be equal to params_physical_width(params);
> >> like before
> >
> > Still, it's not obvious what slots and slot_width are going to be set to
> > in a non-TDM setup where that doesn't really make much sense.
>
> My understanding is:
>
> "slots" is channels per frame + padding slots, regardless of format.
> "slot_width" is bits per sample + padding bits, regardless of format.
>
> Some formats may require or prohibit certain padding, but that has no
> effect on the definitions.
>
> That seems clear to me? At least that's what I implemented (and you
> acked) in sun8i-codec.
Yeah I guess you're right. I'd still like at least a comment on top of
the function making that clear so that no-one's confused
Maxime
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