Re: [PATCH 06/14] ASoC: Add sun8i digital audio codec
From: Mylene Josserand
Date: Wed Oct 05 2016 - 07:55:12 EST
Hello,
On 04/10/2016 14:40, Thomas Petazzoni wrote:
Hello,
On Tue, 4 Oct 2016 11:46:19 +0200, MylÃne Josserand wrote:
Add the digital sun8i audio codec which handles the base register
(without DAI).
I'm not sure what you mean by "which handles the base register".
I wanted to explain that it is registers for audio codec and not PRCM
ones. This is, maybe, unclear (and useless ?).
diff --git a/sound/soc/sunxi/Kconfig b/sound/soc/sunxi/Kconfig
index 7aee95a..9e287b0 100644
--- a/sound/soc/sunxi/Kconfig
+++ b/sound/soc/sunxi/Kconfig
@@ -27,6 +27,15 @@ config SND_SUN4I_SPDIF
Say Y or M to add support for the S/PDIF audio block in the Allwinner
A10 and affiliated SoCs.
+config SND_SUN8I_CODEC
+ tristate "Allwinner SUN8I audio codec"
+ select REGMAP_MMIO
+ help
Indentation issue here, it should be intended with one tab, not spaces.
You probably also want a "depends on OF" here.
Yes, thanks !
+/* CODEC_OFFSET represents the offset of the codec registers
+ * and not all the DAI registers
+ */
This is not the proper comment style I believe for audio code, it
should be:
/*
* ...
*/
+#define CODEC_OFFSET 0x200
Do you really need this CODEC_OFFSET macro? Why not simply use directly
the right offsets? I.e instead of:
#define SUN8I_SYSCLK_CTL (0x20c - CODEC_OFFSET)
use:
#define SUN8I_SYSCLK_CTL 0xc
I thought it could be easier to find registers using offset but I guess
that register's names are enough.
+#define CODEC_BASSADDRESS 0x01c22c00
This define is not used anywhere.
Yes, sorry, I forgot to remove it.
+#define SUN8I_SYSCLK_CTL (0x20c - CODEC_OFFSET)
+#define SUN8I_SYSCLK_CTL_AIF1CLK_ENA (11)
+#define SUN8I_SYSCLK_CTL_SYSCLK_ENA (3)
+#define SUN8I_SYSCLK_CTL_SYSCLK_SRC (0)
Parenthesis around single values are not really useful.
+#define SUN8I_MOD_CLK_ENA (0x210 - CODEC_OFFSET)
+#define SUN8I_MOD_CLK_ENA_AIF1 (15)
+#define SUN8I_MOD_CLK_ENA_DAC (2)
+#define SUN8I_MOD_RST_CTL (0x214 - CODEC_OFFSET)
+#define SUN8I_MOD_RST_CTL_AIF1 (15)
+#define SUN8I_MOD_RST_CTL_DAC (2)
+#define SUN8I_SYS_SR_CTRL (0x218 - CODEC_OFFSET)
+#define SUN8I_SYS_SR_CTRL_AIF1_FS (12)
+#define SUN8I_SYS_SR_CTRL_AIF2_FS (8)
+#define SUN8I_AIF1CLK_CTRL (0x240 - CODEC_OFFSET)
+#define SUN8I_AIF1CLK_CTRL_AIF1_MSTR_MOD (15)
+#define SUN8I_AIF1CLK_CTRL_AIF1_BCLK_INV (14)
+#define SUN8I_AIF1CLK_CTRL_AIF1_LRCK_INV (13)
+#define SUN8I_AIF1CLK_CTRL_AIF1_BCLK_DIV (9)
+#define SUN8I_AIF1CLK_CTRL_AIF1_LRCK_DIV (6)
+#define SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ (4)
+#define SUN8I_AIF1CLK_CTRL_AIF1_DATA_FMT (2)
+#define SUN8I_AIF1_DACDAT_CTRL (0x248 - CODEC_OFFSET)
+#define SUN8I_AIF1_DACDAT_CTRL_AIF1_DA0L_ENA (15)
+#define SUN8I_AIF1_DACDAT_CTRL_AIF1_DA0R_ENA (14)
+#define SUN8I_DAC_DIG_CTRL (0x320 - CODEC_OFFSET)
+#define SUN8I_DAC_DIG_CTRL_ENDA (15)
+#define SUN8I_DAC_MXR_SRC (0x330 - CODEC_OFFSET)
+#define SUN8I_DAC_MXR_SRC_DACL_MXR_SRC_AIF1DA0L (15)
+#define SUN8I_DAC_MXR_SRC_DACL_MXR_SRC_AIF1DA1L (14)
+#define SUN8I_DAC_MXR_SRC_DACL_MXR_SRC_AIF2DACL (13)
+#define SUN8I_DAC_MXR_SRC_DACL_MXR_SRC_ADCL (12)
+#define SUN8I_DAC_MXR_SRC_DACR_MXR_SRC_AIF1DA0R (11)
+#define SUN8I_DAC_MXR_SRC_DACR_MXR_SRC_AIF1DA1R (10)
+#define SUN8I_DAC_MXR_SRC_DACR_MXR_SRC_AIF2DACR (9)
+#define SUN8I_DAC_MXR_SRC_DACR_MXR_SRC_ADCR (8)
Indentation of the value is not very clean for those last defines.
+static int sun8i_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
+{
+ struct sun8i_codec *scodec = snd_soc_codec_get_drvdata(dai->codec);
+ unsigned long value;
I'm not sure "unsigned long" is a very good choice here, it's going to
be a 64 bits integer on 64 bits platform. I'd suggest to use "u32",
which also seems to be what's used in _set_fmt() function of the
sun4i-i2s.c driver.
Agreed, thanks !
+static int sun8i_codec_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ int rs_value = 0;
Two spaces before the = sign, not needed. Is the initialization to 0
really needed? Also, this should be a u32.
ditto
+ regmap_update_bits(scodec->regmap, SUN8I_AIF1CLK_CTRL,
+ 0x3 << SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ,
Maybe a #define value to replace the hardcoded 0x3 ?
+ rs_value << SUN8I_AIF1CLK_CTRL_AIF1_WORD_SIZ);
+
+ /* calculate bclk_lrck_div Ratio */
+ bclk_lrck_div = sample_resolution * 2;
+ switch (bclk_lrck_div) {
+ case 16:
+ bclk_lrck_div = 0;
+ break;
+ case 32:
+ bclk_lrck_div = 1;
+ break;
+ case 64:
+ bclk_lrck_div = 2;
+ break;
+ case 128:
+ bclk_lrck_div = 3;
+ break;
+ case 256:
+ bclk_lrck_div = 4;
+ break;
This could quite easily be replaced by a formula, if you don't care
about error checking:
bclk_lrck_div = log2(bclk_lrck_div) - 4;
Of course, if you care about error checking, this switch is nicer.
+ default:
So there's no error checking if the value is not supported?
You are right. I guess it should return -EINVAL.
[snip]
+static struct snd_soc_dai_driver sun8i_codec_dai = {
+ .name = "sun8i",
+ /* playback capabilities */
+ .playback = {
+ .stream_name = "Playback",
+ .channels_min = 1,
+ .channels_max = 2,
+ .rates = SNDRV_PCM_RATE_8000_192000 |
+ SNDRV_PCM_RATE_KNOT,
+ .formats = SNDRV_PCM_FMTBIT_S8 |
+ SNDRV_PCM_FMTBIT_S16_LE |
+ SNDRV_PCM_FMTBIT_S18_3LE |
+ SNDRV_PCM_FMTBIT_S20_3LE |
+ SNDRV_PCM_FMTBIT_S24_LE |
+ SNDRV_PCM_FMTBIT_S32_LE,
+ },
+ /* pcm operations */
+ .ops = &sun8i_codec_dai_ops,
+};
+EXPORT_SYMBOL(sun8i_codec_dai);
This EXPORT_SYMBOL looks wrong. First because it doesn't seem to be
used outside of this module. And second because using EXPORT_SYMBOL on
a function defined as static doesn't make much sense, as the "static"
qualifier limits the visibility of the symbol to the current
compilation unit.
Yes, sorry, I missed it from the clean-up of the original driver.
[snip]
+static int sun8i_codec_probe(struct platform_device *pdev)
+{
+ struct resource *res_base;
+ struct sun8i_codec *scodec;
+ void __iomem *base;
+
+ scodec = devm_kzalloc(&pdev->dev, sizeof(*scodec), GFP_KERNEL);
+ if (!scodec)
+ return -ENOMEM;
+
+ scodec->dev = &pdev->dev;
+
+ /* Get the clocks from the DT */
+ scodec->clk_module = devm_clk_get(&pdev->dev, "codec");
+ if (IS_ERR(scodec->clk_module)) {
+ dev_err(&pdev->dev, "Failed to get the module clock\n");
+ return PTR_ERR(scodec->clk_module);
+ }
+ if (clk_prepare_enable(scodec->clk_module))
+ pr_err("err:open failed;\n");
Grr, pr_err, not good. Plus you want to return with an error from the
probe() function.
Oh, sorry for that ugly use :(
+
+ scodec->clk_apb = devm_clk_get(&pdev->dev, "apb");
+ if (IS_ERR(scodec->clk_apb)) {
+ dev_err(&pdev->dev, "Failed to get the apb clock\n");
+ return PTR_ERR(scodec->clk_apb);
+ }
+ if (clk_prepare_enable(scodec->clk_apb))
+ pr_err("err:open failed;\n");
Ditto. + unprepare/disable the previous clock.
[snip]
ack, thank you for the review!
--
MylÃne Josserand, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com