2019-07-02 15:48:53

by Olivier Moysan

Subject: [PATCH 3/3] drm/bridge: sii902x: make audio mclk optional

The master clock on i2s bus is not mandatory,
as sii902X internal PLL can be used instead.
Make use of mclk optional.

Fixes: ff5781634c41 ("drm/bridge: sii902x: Implement HDMI audio support")

Signed-off-by: Olivier Moysan <[email protected]>
---
drivers/gpu/drm/bridge/sii902x.c | 39 +++++++++++++++++++++++----------------
1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
index 36acc256e67e..a08bd9fdc046 100644
--- a/drivers/gpu/drm/bridge/sii902x.c
+++ b/drivers/gpu/drm/bridge/sii902x.c
@@ -562,19 +562,21 @@ static int sii902x_audio_hw_params(struct device *dev, void *data,
}
}

- ret = clk_prepare_enable(sii902x->audio.mclk);
- if (ret) {
- dev_err(dev, "Enabling mclk failed: %d\n", ret);
- return ret;
- }
+ if (sii902x->audio.mclk) {
+ ret = clk_prepare_enable(sii902x->audio.mclk);
+ if (ret) {
+ dev_err(dev, "Enabling mclk failed: %d\n", ret);
+ return ret;
+ }

- mclk_rate = clk_get_rate(sii902x->audio.mclk);
+ mclk_rate = clk_get_rate(sii902x->audio.mclk);

- ret = sii902x_select_mclk_div(&i2s_config_reg, params->sample_rate,
- mclk_rate);
- if (mclk_rate != ret * params->sample_rate)
- dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
- mclk_rate, ret, params->sample_rate);
+ ret = sii902x_select_mclk_div(&i2s_config_reg,
+ params->sample_rate, mclk_rate);
+ if (mclk_rate != ret * params->sample_rate)
+ dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
+ mclk_rate, ret, params->sample_rate);
+ }

mutex_lock(&sii902x->mutex);

@@ -640,7 +642,8 @@ static int sii902x_audio_hw_params(struct device *dev, void *data,
mutex_unlock(&sii902x->mutex);

if (ret) {
- clk_disable_unprepare(sii902x->audio.mclk);
+ if (sii902x->audio.mclk)
+ clk_disable_unprepare(sii902x->audio.mclk);
dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
ret);
}
@@ -659,7 +662,8 @@ static void sii902x_audio_shutdown(struct device *dev, void *data)

mutex_unlock(&sii902x->mutex);

- clk_disable_unprepare(sii902x->audio.mclk);
+ if (sii902x->audio.mclk)
+ clk_disable_unprepare(sii902x->audio.mclk);
}

int sii902x_audio_digital_mute(struct device *dev, void *data, bool enable)
@@ -752,9 +756,12 @@ static int sii902x_audio_codec_init(struct sii902x *sii902x,

sii902x->audio.mclk = devm_clk_get(dev, "mclk");
if (IS_ERR(sii902x->audio.mclk)) {
- dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
- __func__, PTR_ERR(sii902x->audio.mclk));
- return 0;
+ if (PTR_ERR(sii902x->audio.mclk) != -ENOENT) {
+ dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
+ __func__, PTR_ERR(sii902x->audio.mclk));
+ return PTR_ERR(sii902x->audio.mclk);
+ }
+ sii902x->audio.mclk = NULL;
}

sii902x->audio.pdev = platform_device_register_data(
--
2.7.4

2019-07-04 08:32:20

by Jyri Sarha

Subject: Re: [PATCH 3/3] drm/bridge: sii902x: make audio mclk optional

On 02/07/2019 18:47, Olivier Moysan wrote:
> The master clock on i2s bus is not mandatory,
> as sii902X internal PLL can be used instead.
> Make use of mclk optional.
>
> Fixes: ff5781634c41 ("drm/bridge: sii902x: Implement HDMI audio support")
>
> Signed-off-by: Olivier Moysan <[email protected]>

Reviewed-by: Jyri Sarha <[email protected]>

> ---
> drivers/gpu/drm/bridge/sii902x.c | 39 +++++++++++++++++++++++----------------
> 1 file changed, 23 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> index 36acc256e67e..a08bd9fdc046 100644
> --- a/drivers/gpu/drm/bridge/sii902x.c
> +++ b/drivers/gpu/drm/bridge/sii902x.c
> @@ -562,19 +562,21 @@ static int sii902x_audio_hw_params(struct device *dev, void *data,
> }
> }
>
> - ret = clk_prepare_enable(sii902x->audio.mclk);
> - if (ret) {
> - dev_err(dev, "Enabling mclk failed: %d\n", ret);
> - return ret;
> - }
> + if (sii902x->audio.mclk) {
> + ret = clk_prepare_enable(sii902x->audio.mclk);
> + if (ret) {
> + dev_err(dev, "Enabling mclk failed: %d\n", ret);
> + return ret;
> + }
>
> - mclk_rate = clk_get_rate(sii902x->audio.mclk);
> + mclk_rate = clk_get_rate(sii902x->audio.mclk);
>
> - ret = sii902x_select_mclk_div(&i2s_config_reg, params->sample_rate,
> - mclk_rate);
> - if (mclk_rate != ret * params->sample_rate)
> - dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
> - mclk_rate, ret, params->sample_rate);
> + ret = sii902x_select_mclk_div(&i2s_config_reg,
> + params->sample_rate, mclk_rate);
> + if (mclk_rate != ret * params->sample_rate)
> + dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
> + mclk_rate, ret, params->sample_rate);
> + }
>
> mutex_lock(&sii902x->mutex);
>
> @@ -640,7 +642,8 @@ static int sii902x_audio_hw_params(struct device *dev, void *data,
> mutex_unlock(&sii902x->mutex);
>
> if (ret) {
> - clk_disable_unprepare(sii902x->audio.mclk);
> + if (sii902x->audio.mclk)
> + clk_disable_unprepare(sii902x->audio.mclk);
> dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
> ret);
> }
> @@ -659,7 +662,8 @@ static void sii902x_audio_shutdown(struct device *dev, void *data)
>
> mutex_unlock(&sii902x->mutex);
>
> - clk_disable_unprepare(sii902x->audio.mclk);
> + if (sii902x->audio.mclk)
> + clk_disable_unprepare(sii902x->audio.mclk);
> }
>
> int sii902x_audio_digital_mute(struct device *dev, void *data, bool enable)
> @@ -752,9 +756,12 @@ static int sii902x_audio_codec_init(struct sii902x *sii902x,
>
> sii902x->audio.mclk = devm_clk_get(dev, "mclk");
> if (IS_ERR(sii902x->audio.mclk)) {
> - dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
> - __func__, PTR_ERR(sii902x->audio.mclk));
> - return 0;
> + if (PTR_ERR(sii902x->audio.mclk) != -ENOENT) {
> + dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
> + __func__, PTR_ERR(sii902x->audio.mclk));
> + return PTR_ERR(sii902x->audio.mclk);
> + }
> + sii902x->audio.mclk = NULL;
> }
>
> sii902x->audio.pdev = platform_device_register_data(
>


--
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

2019-07-05 13:20:22

by Philippe Cornu

Subject: Re: [PATCH 3/3] drm/bridge: sii902x: make audio mclk optional

Hi Olivier,
and many thanks for your patch.

Reviewed-by: Philippe Cornu <[email protected]>
Philippe :-)

On 7/2/19 5:47 PM, Olivier Moysan wrote:
> The master clock on i2s bus is not mandatory,
> as sii902X internal PLL can be used instead.
> Make use of mclk optional.
>
> Fixes: ff5781634c41 ("drm/bridge: sii902x: Implement HDMI audio support")
>
> Signed-off-by: Olivier Moysan <[email protected]>
> ---
> drivers/gpu/drm/bridge/sii902x.c | 39 +++++++++++++++++++++++----------------
> 1 file changed, 23 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> index 36acc256e67e..a08bd9fdc046 100644
> --- a/drivers/gpu/drm/bridge/sii902x.c
> +++ b/drivers/gpu/drm/bridge/sii902x.c
> @@ -562,19 +562,21 @@ static int sii902x_audio_hw_params(struct device *dev, void *data,
> }
> }
>
> - ret = clk_prepare_enable(sii902x->audio.mclk);
> - if (ret) {
> - dev_err(dev, "Enabling mclk failed: %d\n", ret);
> - return ret;
> - }
> + if (sii902x->audio.mclk) {
> + ret = clk_prepare_enable(sii902x->audio.mclk);
> + if (ret) {
> + dev_err(dev, "Enabling mclk failed: %d\n", ret);
> + return ret;
> + }
>
> - mclk_rate = clk_get_rate(sii902x->audio.mclk);
> + mclk_rate = clk_get_rate(sii902x->audio.mclk);
>
> - ret = sii902x_select_mclk_div(&i2s_config_reg, params->sample_rate,
> - mclk_rate);
> - if (mclk_rate != ret * params->sample_rate)
> - dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
> - mclk_rate, ret, params->sample_rate);
> + ret = sii902x_select_mclk_div(&i2s_config_reg,
> + params->sample_rate, mclk_rate);
> + if (mclk_rate != ret * params->sample_rate)
> + dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
> + mclk_rate, ret, params->sample_rate);
> + }
>
> mutex_lock(&sii902x->mutex);
>
> @@ -640,7 +642,8 @@ static int sii902x_audio_hw_params(struct device *dev, void *data,
> mutex_unlock(&sii902x->mutex);
>
> if (ret) {
> - clk_disable_unprepare(sii902x->audio.mclk);
> + if (sii902x->audio.mclk)
> + clk_disable_unprepare(sii902x->audio.mclk);
> dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
> ret);
> }
> @@ -659,7 +662,8 @@ static void sii902x_audio_shutdown(struct device *dev, void *data)
>
> mutex_unlock(&sii902x->mutex);
>
> - clk_disable_unprepare(sii902x->audio.mclk);
> + if (sii902x->audio.mclk)
> + clk_disable_unprepare(sii902x->audio.mclk);
> }
>
> int sii902x_audio_digital_mute(struct device *dev, void *data, bool enable)
> @@ -752,9 +756,12 @@ static int sii902x_audio_codec_init(struct sii902x *sii902x,
>
> sii902x->audio.mclk = devm_clk_get(dev, "mclk");
> if (IS_ERR(sii902x->audio.mclk)) {
> - dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
> - __func__, PTR_ERR(sii902x->audio.mclk));
> - return 0;
> + if (PTR_ERR(sii902x->audio.mclk) != -ENOENT) {
> + dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
> + __func__, PTR_ERR(sii902x->audio.mclk));
> + return PTR_ERR(sii902x->audio.mclk);
> + }
> + sii902x->audio.mclk = NULL;
> }
>
> sii902x->audio.pdev = platform_device_register_data(
>

2019-07-12 10:47:50

by Andrzej Hajda

Subject: Re: [PATCH 3/3] drm/bridge: sii902x: make audio mclk optional

On 02.07.2019 17:47, Olivier Moysan wrote:
> The master clock on i2s bus is not mandatory,
> as sii902X internal PLL can be used instead.
> Make use of mclk optional.
>
> Fixes: ff5781634c41 ("drm/bridge: sii902x: Implement HDMI audio support")
>
> Signed-off-by: Olivier Moysan <[email protected]>
> ---
> drivers/gpu/drm/bridge/sii902x.c | 39 +++++++++++++++++++++++----------------
> 1 file changed, 23 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/sii902x.c b/drivers/gpu/drm/bridge/sii902x.c
> index 36acc256e67e..a08bd9fdc046 100644
> --- a/drivers/gpu/drm/bridge/sii902x.c
> +++ b/drivers/gpu/drm/bridge/sii902x.c
> @@ -562,19 +562,21 @@ static int sii902x_audio_hw_params(struct device *dev, void *data,
> }
> }
>
> - ret = clk_prepare_enable(sii902x->audio.mclk);
> - if (ret) {
> - dev_err(dev, "Enabling mclk failed: %d\n", ret);
> - return ret;
> - }
> + if (sii902x->audio.mclk) {
> + ret = clk_prepare_enable(sii902x->audio.mclk);
> + if (ret) {
> + dev_err(dev, "Enabling mclk failed: %d\n", ret);
> + return ret;
> + }
>
> - mclk_rate = clk_get_rate(sii902x->audio.mclk);
> + mclk_rate = clk_get_rate(sii902x->audio.mclk);
>
> - ret = sii902x_select_mclk_div(&i2s_config_reg, params->sample_rate,
> - mclk_rate);
> - if (mclk_rate != ret * params->sample_rate)
> - dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
> - mclk_rate, ret, params->sample_rate);
> + ret = sii902x_select_mclk_div(&i2s_config_reg,
> + params->sample_rate, mclk_rate);
> + if (mclk_rate != ret * params->sample_rate)
> + dev_dbg(dev, "Inaccurate reference clock (%ld/%d != %u)\n",
> + mclk_rate, ret, params->sample_rate);
> + }
>
> mutex_lock(&sii902x->mutex);
>
> @@ -640,7 +642,8 @@ static int sii902x_audio_hw_params(struct device *dev, void *data,
> mutex_unlock(&sii902x->mutex);
>
> if (ret) {
> - clk_disable_unprepare(sii902x->audio.mclk);
> + if (sii902x->audio.mclk)
> + clk_disable_unprepare(sii902x->audio.mclk);


"if" clause is not necessary


> dev_err(dev, "%s: hdmi audio enable failed: %d\n", __func__,
> ret);
> }
> @@ -659,7 +662,8 @@ static void sii902x_audio_shutdown(struct device *dev, void *data)
>
> mutex_unlock(&sii902x->mutex);
>
> - clk_disable_unprepare(sii902x->audio.mclk);
> + if (sii902x->audio.mclk)

ditto

> + clk_disable_unprepare(sii902x->audio.mclk);
> }
>
> int sii902x_audio_digital_mute(struct device *dev, void *data, bool enable)
> @@ -752,9 +756,12 @@ static int sii902x_audio_codec_init(struct sii902x *sii902x,
>
> sii902x->audio.mclk = devm_clk_get(dev, "mclk");
> if (IS_ERR(sii902x->audio.mclk)) {
> - dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
> - __func__, PTR_ERR(sii902x->audio.mclk));
> - return 0;
> + if (PTR_ERR(sii902x->audio.mclk) != -ENOENT) {
> + dev_err(dev, "%s: No clock (audio mclk) found: %ld\n",
> + __func__, PTR_ERR(sii902x->audio.mclk));
> + return PTR_ERR(sii902x->audio.mclk);
> + }
> + sii902x->audio.mclk = NULL;


devm_clk_get_optional should be used here.

Summarizing, clk framework supports NULL clocks so you can adjust code
to benefit from it: no need to checks "if (sii902x->audio.mclk)". The
only place you should care is near clk_get_rate, for null clock it will
return 0, so you should react appropriately.

With that changed:

Reviewed-by: Andrzej Hajda <[email protected]>

 --
Regards
Andrzej


> }
>
> sii902x->audio.pdev = platform_device_register_data(