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[216.228.112.21]) by smtp.gmail.com with ESMTPSA id x1sm683125pju.3.2020.06.15.18.59.07 (version=TLS1_2 cipher=ECDHE-ECDSA-CHACHA20-POLY1305 bits=256/256); Mon, 15 Jun 2020 18:59:07 -0700 (PDT) Date: Mon, 15 Jun 2020 18:58:52 -0700 From: Nicolin Chen To: Shengjiu Wang Subject: Re: [PATCH v2] ASoC: fsl_ssi: Fix bclk calculation for mono channel Message-ID: <20200616015851.GA23235@Asurada-Nvidia> References: <20200615230912.GA16681@Asurada-Nvidia> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.9.4 (2018-02-28) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Linux-ALSA , Timur Tabi , Xiubo Li , Fabio Estevam , Shengjiu Wang , Takashi Iwai , linux-kernel , Mark Brown , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Jun 16, 2020 at 09:48:39AM +0800, Shengjiu Wang wrote: > On Tue, Jun 16, 2020 at 7:11 AM Nicolin Chen wrote: > > > > On Mon, Jun 15, 2020 at 01:56:18PM +0800, Shengjiu Wang wrote: > > > For mono channel, SSI will switch to Normal mode. > > > > > > In Normal mode and Network mode, the Word Length Control bits > > > control the word length divider in clock generator, which is > > > different with I2S Master mode (the word length is fixed to > > > 32bit), it should be the value of params_width(hw_params). > > > > > > The condition "slots == 2" is not good for I2S Master mode, > > > because for Network mode and Normal mode, the slots can also > > > be 2. Then we need to use (ssi->i2s_net & SSI_SCR_I2S_MODE_MASK) > > > to check if it is I2S Master mode. > > > > The fsl_ssi_set_bclk is only called when fsl_ssi_is_i2s_master, > > though I agree that that line of comments sounds confusing now. > > Actually I think fsl_ssi_is_i2s_master is not accurate, it just checks > the Master mode, but didn't check the I2S mode. > > > > > > So we refine the famula for mono channel, otherwise there > > > > famula => formula? > > > > > will be sound issue for S24_LE. > > > > > > Fixes: b0a7043d5c2c ("ASoC: fsl_ssi: Caculate bit clock rate using slot number and width") > > > Signed-off-by: Shengjiu Wang > > > --- > > > changes in v2 > > > - refine patch for Network mode and Normal mode. > > > > > > sound/soc/fsl/fsl_ssi.c | 15 +++++++++++---- > > > 1 file changed, 11 insertions(+), 4 deletions(-) > > > > > > diff --git a/sound/soc/fsl/fsl_ssi.c b/sound/soc/fsl/fsl_ssi.c > > > index bad89b0d129e..cbf67d132fda 100644 > > > --- a/sound/soc/fsl/fsl_ssi.c > > > +++ b/sound/soc/fsl/fsl_ssi.c > > > @@ -678,7 +678,8 @@ static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream, > > > struct regmap *regs = ssi->regs; > > > u32 pm = 999, div2, psr, stccr, mask, afreq, factor, i; > > > unsigned long clkrate, baudrate, tmprate; > > > - unsigned int slots = params_channels(hw_params); > > > + unsigned int channels = params_channels(hw_params); > > > + unsigned int slots; > > > unsigned int slot_width = 32; > > > u64 sub, savesub = 100000; > > > unsigned int freq; > > > @@ -688,9 +689,15 @@ static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream, > > > /* Override slots and slot_width if being specifically set... */ > > > if (ssi->slots) > > > slots = ssi->slots; > > > - /* ...but keep 32 bits if slots is 2 -- I2S Master mode */ > > > - if (ssi->slot_width && slots != 2) > > > - slot_width = ssi->slot_width; > > > + else > > > + /* Apply two slots for mono channel, because DC = 2 */ > > > + slots = (channels == 1) ? 2 : channels; > > > + > > > + /* ...but keep 32 bits if I2S Master mode */ > > > + if ((ssi->i2s_net & SSI_SCR_I2S_MODE_MASK) != SSI_SCR_I2S_MODE_MASTER || > > > + channels == 1) > > > + slot_width = ssi->slot_width ? ssi->slot_width : > > > > This looks very complicated...can you review and try mine? > > (Basically, take 32-bit out of default but force it later) > > > > @@ -678,8 +678,9 @@ static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream, > > struct regmap *regs = ssi->regs; > > u32 pm = 999, div2, psr, stccr, mask, afreq, factor, i; > > unsigned long clkrate, baudrate, tmprate; > > - unsigned int slots = params_channels(hw_params); > > - unsigned int slot_width = 32; > > + unsigned int channels = params_channels(hw_params); > > + unsigned int slot_width = params_width(hw_params); > > + unsigned int slots = 2; > > u64 sub, savesub = 100000; > > unsigned int freq; > > bool baudclk_is_used; > > @@ -688,10 +689,16 @@ static int fsl_ssi_set_bclk(struct snd_pcm_substream *substream, > > /* Override slots and slot_width if being specifically set... */ > > if (ssi->slots) > > slots = ssi->slots; > > - /* ...but keep 32 bits if slots is 2 -- I2S Master mode */ > > - if (ssi->slot_width && slots != 2) > > + if (ssi->slot_width) > > slot_width = ssi->slot_width; > > > > + /* > > + * ...but force 32 bits for stereo audio. Note that mono audio is also > > + * sent in 2 slots via NORMAL mode, so check both slots and channels. > > + */ > > + if (slots == 2 && channels == 2) > > + slot_width = 32; > > slots ==2 && channels ==2 does not mean the I2S Master mode. > For LEFT_J, it is also slots =2 & channels = 2, then the slot_width > should be params_width(hw_params). > and DSP_A/B also supports stereo. I think you have a point. Then would this condition work? + /* ...but force 32 bits for stereo audio using I2S Master Mode */ + if (channels == 2 && + ssi->i2s_net & SSI_SCR_I2S_MODE_MASK == SSI_SCR_I2S_MODE_MASTER) Similar to yours but the code above it could look straightforward.