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Message-ID: <CAEKpxBmGmG_6yuJ2eddSYE3_QUjGkMh1oXyzaJ_PEBK5PD=OaQ@mail.gmail.com>
Date: Tue, 20 Dec 2016 20:40:18 +0100
From: Code Kipper <codekipper@...il.com>
To: Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc: linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-sunxi <linux-sunxi@...glegroups.com>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
alsa-devel@...a-project.org,
"Andrea Venturi (pers)" <be17068@...rbole.bo.it>
Subject: Re: [PATCH] ASoC: sun4i-i2s: Add quirks for newer SoCs
On 20 December 2016 at 20:16, Maxime Ripard
<maxime.ripard@...e-electrons.com> wrote:
> Hi,
>
> On Tue, Dec 20, 2016 at 03:55:24PM +0100, codekipper@...il.com wrote:
>> From: Marcus Cooper <codekipper@...il.com>
>>
>> Newer SoCs have additional functionality so a quirks structure
>> has been added to handle them. So far we've seen the use of a
>> reset controller, a different address for the TXFIFO and varying
>> register changes.
>>
>> This patch prepares the driver for these changes and adds the
>> reset specifier.
>>
>> Signed-off-by: Marcus Cooper <codekipper@...il.com>
>> ---
>> .../devicetree/bindings/sound/sun4i-i2s.txt | 2 +
>> sound/soc/sunxi/sun4i-i2s.c | 47 ++++++++++++++++++++--
>> 2 files changed, 45 insertions(+), 4 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
>> index 7a2c0945fd22..494a881ccd21 100644
>> --- a/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
>> +++ b/Documentation/devicetree/bindings/sound/sun4i-i2s.txt
>> @@ -18,6 +18,8 @@ Required properties:
>> - "apb" : clock for the I2S bus interface
>> - "mod" : module clock for the I2S controller
>> - #sound-dai-cells : Must be equal to 0
>> +- resets: reset specifier for the ahb reset (A31 and newer only)
>> +
>>
>> Example:
>>
>> diff --git a/sound/soc/sunxi/sun4i-i2s.c b/sound/soc/sunxi/sun4i-i2s.c
>> index f24d19526603..80fe4f1d6e3b 100644
>> --- a/sound/soc/sunxi/sun4i-i2s.c
>> +++ b/sound/soc/sunxi/sun4i-i2s.c
>> @@ -14,9 +14,11 @@
>> #include <linux/clk.h>
>> #include <linux/dmaengine.h>
>> #include <linux/module.h>
>> +#include <linux/of_device.h>
>> #include <linux/platform_device.h>
>> #include <linux/pm_runtime.h>
>> #include <linux/regmap.h>
>> +#include <linux/reset.h>
>>
>> #include <sound/dmaengine_pcm.h>
>> #include <sound/pcm_params.h>
>> @@ -92,6 +94,7 @@ struct sun4i_i2s {
>> struct clk *bus_clk;
>> struct clk *mod_clk;
>> struct regmap *regmap;
>> + struct reset_control *rst;
>>
>> unsigned int mclk_freq;
>>
>> @@ -104,6 +107,13 @@ struct sun4i_i2s_clk_div {
>> u8 val;
>> };
>>
>> +struct sun4i_i2s_quirks {
>> + unsigned int reg_dac_txdata; /* TX FIFO offset for DMA config */
>> + bool has_reset;
>> + const struct regmap_config *sun4i_i2s_regmap;
>> + const struct snd_soc_dai_ops *ops;
>> +};
>> +
>
> This is quite hard to review without actual example of what you'll put
> in there.
Fair enough...I have a patch for the A31 but haven't got any hardware
that I can verify it on. I've confirmed on the H3 but I feel like that
patch needs some tidying up. That being said...I'll push it as a patch
set and we can talk about the setup.
>
>> static const struct sun4i_i2s_clk_div sun4i_i2s_bclk_div[] = {
>> { .div = 2, .val = 0 },
>> { .div = 4, .val = 1 },
>> @@ -541,7 +551,6 @@ static struct snd_soc_dai_driver sun4i_i2s_dai = {
>> .rates = SNDRV_PCM_RATE_8000_192000,
>> .formats = SNDRV_PCM_FMTBIT_S16_LE,
>> },
>> - .ops = &sun4i_i2s_dai_ops,
>> .symmetric_rates = 1,
>> };
>>
>> @@ -655,6 +664,7 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
>> {
>> struct sun4i_i2s *i2s;
>> struct resource *res;
>> + const struct sun4i_i2s_quirks *quirks;
>> void __iomem *regs;
>> int irq, ret;
>>
>> @@ -680,8 +690,14 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
>> return PTR_ERR(i2s->bus_clk);
>> }
>>
>> + quirks = of_device_get_match_data(&pdev->dev);
>> + if (quirks == NULL) {
>> + dev_err(&pdev->dev, "Failed to determine the quirks to use\n");
>> + return -ENODEV;
>> + }
>> +
>> i2s->regmap = devm_regmap_init_mmio(&pdev->dev, regs,
>> - &sun4i_i2s_regmap_config);
>> + quirks->sun4i_i2s_regmap);
>> if (IS_ERR(i2s->regmap)) {
>> dev_err(&pdev->dev, "Regmap initialisation failed\n");
>> return PTR_ERR(i2s->regmap);
>> @@ -692,13 +708,25 @@ static int sun4i_i2s_probe(struct platform_device *pdev)
>> dev_err(&pdev->dev, "Can't get our mod clock\n");
>> return PTR_ERR(i2s->mod_clk);
>> }
>> +
>
> Spurious change?
ACK
>
>>
>> - i2s->playback_dma_data.addr = res->start + SUN4I_I2S_FIFO_TX_REG;
>> + i2s->playback_dma_data.addr = res->start + quirks->reg_dac_txdata;
>> i2s->playback_dma_data.maxburst = 4;
>>
>> i2s->capture_dma_data.addr = res->start + SUN4I_I2S_FIFO_RX_REG;
>> i2s->capture_dma_data.maxburst = 4;
>>
>> + if (quirks->has_reset) {
>> + i2s->rst = devm_reset_control_get_optional(&pdev->dev, NULL);
>> + if (IS_ERR(i2s->rst) && PTR_ERR(i2s->rst) == -EPROBE_DEFER) {
>> + ret = -EPROBE_DEFER;
>> + dev_err(&pdev->dev, "Failed to get reset: %d\n", ret);
>> + goto err_pm_disable;
>> + }
>> + if (!IS_ERR(i2s->rst))
>> + reset_control_deassert(i2s->rst);
>> + }
>> +
>
> That reset line is not optional. The <A31 SoCs don't need it, and you
> cover that case already, but it is definitely mandatory for the A31.
OK..I'll search for a better function call. Thanks for this and the
other reviews.
CK
>
> Thanks,
> Maxime
>
> --
> Maxime Ripard, Free Electrons
> Embedded Linux and Kernel engineering
> http://free-electrons.com
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