[PATCH v2 0/5] ASoC: clock provider clean-up
The purpose of this patchset it remove the use the clk member of 'struct clk_hw' in ASoC. 'struct clk' is a per-user reference to an actual clock. In the future, the clk member in 'struct clk_hw' may go away. The usage of this member by a clock provider usually falls into either of following categories: * Mis-usage of the clock consumer API by a clock provider. * Clock provider also being a user of its own clocks. In this case the provider should request a 'struct clk' through the appropriate API instead of poking in 'struct clk_hw' internals. v1 [0] -> v2: * finalize lpass provider move to devm [0]: https://lore.kernel.org/r/20210410111356.467340-1-jbrunet@baylibre.com Jerome Brunet (5): ASoC: stm32: properly get clk from the provider ASoC: wcd934x: use the clock provider API ASoC: rt5682: clock driver must use the clock provider API ASoC: lpass: use the clock provider API ASoC: da7219: properly get clk from the provider sound/soc/codecs/da7219.c | 5 ++++- sound/soc/codecs/lpass-va-macro.c | 7 ++----- sound/soc/codecs/lpass-wsa-macro.c | 11 +++-------- sound/soc/codecs/rt5682.c | 6 +++--- sound/soc/codecs/wcd934x.c | 6 ++++-- sound/soc/stm/stm32_sai_sub.c | 5 ++++- 6 files changed, 20 insertions(+), 20 deletions(-) -- 2.31.1
Instead of using the clk embedded in the clk_hw (which is meant to go away), a clock provider which need to interact with its own clock should request clk reference through the clock provider API. Reviewed-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> --- sound/soc/stm/stm32_sai_sub.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/sound/soc/stm/stm32_sai_sub.c b/sound/soc/stm/stm32_sai_sub.c index 3aa1cf262402..c1561237ee24 100644 --- a/sound/soc/stm/stm32_sai_sub.c +++ b/sound/soc/stm/stm32_sai_sub.c @@ -484,7 +484,10 @@ static int stm32_sai_add_mclk_provider(struct stm32_sai_sub_data *sai) dev_err(dev, "mclk register returned %d\n", ret); return ret; } - sai->sai_mclk = hw->clk; + + sai->sai_mclk = devm_clk_hw_get_clk(dev, hw, NULL); + if (IS_ERR(sai->sai_mclk)) + return PTR_ERR(sai->sai_mclk); /* register mclk provider */ return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw); -- 2.31.1
Clock providers should use the clk_hw API Reviewed-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> --- sound/soc/codecs/wcd934x.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/sound/soc/codecs/wcd934x.c b/sound/soc/codecs/wcd934x.c index cddc49bbb7f6..046874ef490e 100644 --- a/sound/soc/codecs/wcd934x.c +++ b/sound/soc/codecs/wcd934x.c @@ -2116,11 +2116,13 @@ static struct clk *wcd934x_register_mclk_output(struct wcd934x_codec *wcd) wcd->hw.init = &init; hw = &wcd->hw; - ret = clk_hw_register(wcd->dev->parent, hw); + ret = devm_clk_hw_register(wcd->dev->parent, hw); if (ret) return ERR_PTR(ret); - of_clk_add_provider(np, of_clk_src_simple_get, hw->clk); + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw); + if (ret) + return ERR_PTR(ret); return NULL; } -- 2.31.1
Clock drivers ops should not call the clk API but the clock provider (clk_hw) instead. Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> --- sound/soc/codecs/rt5682.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/sound/soc/codecs/rt5682.c b/sound/soc/codecs/rt5682.c index a5aacfe01a0d..e4c91571abae 100644 --- a/sound/soc/codecs/rt5682.c +++ b/sound/soc/codecs/rt5682.c @@ -2634,7 +2634,7 @@ static int rt5682_wclk_set_rate(struct clk_hw *hw, unsigned long rate, container_of(hw, struct rt5682_priv, dai_clks_hw[RT5682_DAI_WCLK_IDX]); struct snd_soc_component *component = rt5682->component; - struct clk *parent_clk; + struct clk_hw *parent_hw; const char * const clk_name = clk_hw_get_name(hw); int pre_div; unsigned int clk_pll2_out; @@ -2649,8 +2649,8 @@ static int rt5682_wclk_set_rate(struct clk_hw *hw, unsigned long rate, * * It will set the codec anyway by assuming mclk is 48MHz. */ - parent_clk = clk_get_parent(hw->clk); - if (!parent_clk) + parent_hw = clk_hw_get_parent(hw); + if (!parent_hw) dev_warn(component->dev, "Parent mclk of wclk not acquired in driver. Please ensure mclk was provided as %d Hz.\n", CLK_PLL2_FIN); -- 2.31.1
Clock providers should be registered using the clk_hw API. Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> --- sound/soc/codecs/lpass-va-macro.c | 7 ++----- sound/soc/codecs/lpass-wsa-macro.c | 11 +++-------- 2 files changed, 5 insertions(+), 13 deletions(-) diff --git a/sound/soc/codecs/lpass-va-macro.c b/sound/soc/codecs/lpass-va-macro.c index 5294c57b2cd4..56c93f4465c9 100644 --- a/sound/soc/codecs/lpass-va-macro.c +++ b/sound/soc/codecs/lpass-va-macro.c @@ -1343,7 +1343,7 @@ static int va_macro_register_fsgen_output(struct va_macro *va) if (ret) return ret; - return of_clk_add_provider(np, of_clk_src_simple_get, va->hw.clk); + return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &va->hw); } static int va_macro_validate_dmic_sample_rate(u32 dmic_sample_rate, @@ -1452,12 +1452,10 @@ static int va_macro_probe(struct platform_device *pdev) va_macro_dais, ARRAY_SIZE(va_macro_dais)); if (ret) - goto soc_err; + goto err; return ret; -soc_err: - of_clk_del_provider(pdev->dev.of_node); err: clk_bulk_disable_unprepare(VA_NUM_CLKS_MAX, va->clks); @@ -1468,7 +1466,6 @@ static int va_macro_remove(struct platform_device *pdev) { struct va_macro *va = dev_get_drvdata(&pdev->dev); - of_clk_del_provider(pdev->dev.of_node); clk_bulk_disable_unprepare(VA_NUM_CLKS_MAX, va->clks); return 0; diff --git a/sound/soc/codecs/lpass-wsa-macro.c b/sound/soc/codecs/lpass-wsa-macro.c index e79a70386b4b..1a7fa5492f28 100644 --- a/sound/soc/codecs/lpass-wsa-macro.c +++ b/sound/soc/codecs/lpass-wsa-macro.c @@ -2337,10 +2337,9 @@ static const struct clk_ops swclk_gate_ops = { .recalc_rate = swclk_recalc_rate, }; -static struct clk *wsa_macro_register_mclk_output(struct wsa_macro *wsa) +static int wsa_macro_register_mclk_output(struct wsa_macro *wsa) { struct device *dev = wsa->dev; - struct device_node *np = dev->of_node; const char *parent_clk_name; const char *clk_name = "mclk"; struct clk_hw *hw; @@ -2358,11 +2357,9 @@ static struct clk *wsa_macro_register_mclk_output(struct wsa_macro *wsa) hw = &wsa->hw; ret = clk_hw_register(wsa->dev, hw); if (ret) - return ERR_PTR(ret); - - of_clk_add_provider(np, of_clk_src_simple_get, hw->clk); + return ret; - return NULL; + return devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, hw); } static const struct snd_soc_component_driver wsa_macro_component_drv = { @@ -2438,8 +2435,6 @@ static int wsa_macro_remove(struct platform_device *pdev) { struct wsa_macro *wsa = dev_get_drvdata(&pdev->dev); - of_clk_del_provider(pdev->dev.of_node); - clk_bulk_disable_unprepare(WSA_NUM_CLKS_MAX, wsa->clks); return 0; -- 2.31.1
Instead of using the clk embedded in the clk_hw (which is meant to go away), a clock provider which need to interact with its own clock should request clk reference through the clock provider API. Reviewed-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> --- sound/soc/codecs/da7219.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c index 13009d08b09a..bd3c523a8617 100644 --- a/sound/soc/codecs/da7219.c +++ b/sound/soc/codecs/da7219.c @@ -2181,7 +2181,10 @@ static int da7219_register_dai_clks(struct snd_soc_component *component) ret); goto err; } - da7219->dai_clks[i] = dai_clk_hw->clk; + + da7219->dai_clks[i] = devm_clk_hw_get_clk(dev, dai_clk_hw, NULL); + if (IS_ERR(da7219->dai_clks[i])) + return PTR_ERR(da7219->dai_clks[i]); /* For DT setup onecell data, otherwise create lookup */ if (np) { -- 2.31.1
On 4/21/21 7:05 AM, Jerome Brunet wrote:
Instead of using the clk embedded in the clk_hw (which is meant to go away), a clock provider which need to interact with its own clock should request clk reference through the clock provider API.
Reviewed-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
This patch seems to introduce a regression in our modprobe/rmmod tests https://github.com/thesofproject/linux/pull/2870 RMMOD snd_soc_da7219 rmmod: ERROR: Module snd_soc_da7219 is in use Reverting this patch restores the ability to remove the module. Wondering if devm_ increases a module/device refcount somehow?
--- sound/soc/codecs/da7219.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c index 13009d08b09a..bd3c523a8617 100644 --- a/sound/soc/codecs/da7219.c +++ b/sound/soc/codecs/da7219.c @@ -2181,7 +2181,10 @@ static int da7219_register_dai_clks(struct snd_soc_component *component) ret); goto err; } - da7219->dai_clks[i] = dai_clk_hw->clk; + + da7219->dai_clks[i] = devm_clk_hw_get_clk(dev, dai_clk_hw, NULL); + if (IS_ERR(da7219->dai_clks[i])) + return PTR_ERR(da7219->dai_clks[i]);
/* For DT setup onecell data, otherwise create lookup */ if (np) {
On 4/21/21 7:05 AM, Jerome Brunet wrote:
Instead of using the clk embedded in the clk_hw (which is meant to go away), a clock provider which need to interact with its own clock should request clk reference through the clock provider API.
Reviewed-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
This patch seems to introduce a regression in our modprobe/rmmod tests
https://github.com/thesofproject/linux/pull/2870
RMMOD snd_soc_da7219 rmmod: ERROR: Module snd_soc_da7219 is in use
Reverting this patch restores the ability to remove the module.
Wondering if devm_ increases a module/device refcount somehow?
the following diff fixes the issue for me There is an explicit try_module_get() in clk_hw_create_clk, so you end-up increasing the refcount of your own module. devm_ doesn't seem like a good idea here, I think we have to release the clk and its implicit module reference when the component is freed, no? I can send a proper fix if there is consensus. diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c index bd3c523a8617..8696ac749af3 100644 --- a/sound/soc/codecs/da7219.c +++ b/sound/soc/codecs/da7219.c @@ -2182,7 +2182,7 @@ static int da7219_register_dai_clks(struct snd_soc_component *component) goto err; } - da7219->dai_clks[i] = devm_clk_hw_get_clk(dev, dai_clk_hw, NULL); + da7219->dai_clks[i] = clk_hw_get_clk(dai_clk_hw, NULL); if (IS_ERR(da7219->dai_clks[i])) return PTR_ERR(da7219->dai_clks[i]); @@ -2218,6 +2218,8 @@ static int da7219_register_dai_clks(struct snd_soc_component *component) if (da7219->dai_clks_lookup[i]) clkdev_drop(da7219->dai_clks_lookup[i]); + clk_put(da7219->dai_clks[i]); + clk_hw_unregister(&da7219->dai_clks_hw[i]); } while (i-- > 0); @@ -2240,6 +2242,8 @@ static void da7219_free_dai_clks(struct snd_soc_component *component) if (da7219->dai_clks_lookup[i]) clkdev_drop(da7219->dai_clks_lookup[i]); + clk_put(da7219->dai_clks[i]); + clk_hw_unregister(&da7219->dai_clks_hw[i]); }
On Mon 26 Apr 2021 at 20:10, Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> wrote:
On 4/21/21 7:05 AM, Jerome Brunet wrote:
Instead of using the clk embedded in the clk_hw (which is meant to go away), a clock provider which need to interact with its own clock should request clk reference through the clock provider API. Reviewed-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
This patch seems to introduce a regression in our modprobe/rmmod tests
Really sorry about that :/
https://github.com/thesofproject/linux/pull/2870
RMMOD snd_soc_da7219 rmmod: ERROR: Module snd_soc_da7219 is in use
Reverting this patch restores the ability to remove the module.
Wondering if devm_ increases a module/device refcount somehow?
The driver is the provider and consumer, so it is consuming itself. This was the intent, I think the patch should be correct like this. Maybe I overlooked something on the clock side. I'll check. I'm not sure the problem is devm_ variant, it might be clk_hw_get_clk() simpler variant which also plays with module ref counts. I don't have this particular HW to check but I'll try to replicate the test with a dummy module and report ASAP. Of course, I suppose the same problem applies to PATCH 1 of the series
--- sound/soc/codecs/da7219.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/sound/soc/codecs/da7219.c b/sound/soc/codecs/da7219.c index 13009d08b09a..bd3c523a8617 100644 --- a/sound/soc/codecs/da7219.c +++ b/sound/soc/codecs/da7219.c @@ -2181,7 +2181,10 @@ static int da7219_register_dai_clks(struct snd_soc_component *component) ret); goto err; } - da7219->dai_clks[i] = dai_clk_hw->clk; + + da7219->dai_clks[i] = devm_clk_hw_get_clk(dev, dai_clk_hw, NULL); + if (IS_ERR(da7219->dai_clks[i])) + return PTR_ERR(da7219->dai_clks[i]); /* For DT setup onecell data, otherwise create lookup */ if (np) {
On Mon 26 Apr 2021 at 21:35, Jerome Brunet <jbrunet@baylibre.com> wrote:
On Mon 26 Apr 2021 at 20:10, Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> wrote:
On 4/21/21 7:05 AM, Jerome Brunet wrote:
Instead of using the clk embedded in the clk_hw (which is meant to go away), a clock provider which need to interact with its own clock should request clk reference through the clock provider API. Reviewed-by: Stephen Boyd <sboyd@kernel.org> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
This patch seems to introduce a regression in our modprobe/rmmod tests
Really sorry about that :/
https://github.com/thesofproject/linux/pull/2870
RMMOD snd_soc_da7219 rmmod: ERROR: Module snd_soc_da7219 is in use
Reverting this patch restores the ability to remove the module.
Wondering if devm_ increases a module/device refcount somehow?
The driver is the provider and consumer, so it is consuming itself. This was the intent, I think the patch should be correct like this. Maybe I overlooked something on the clock side. I'll check.
I'm not sure the problem is devm_ variant, it might be clk_hw_get_clk() simpler variant which also plays with module ref counts.
I don't have this particular HW to check but I'll try to replicate the test with a dummy module and report ASAP.
Of course, I suppose the same problem applies to PATCH 1 of the series
So I can confirm that the problem is in CCF and the function clk_hw_get_clk() which pins the clocks provider to itself. Not that many clock providers are modules and even less are getting removed. This is probably why this fundamental issue has not been detected before. Thanks a lot for reporting it. Mark, at this point I think it would be best to revert patches 1 and 5 while we work this out in CCF. The other patches are not affected. Sorry for the mess.
On Tue, Apr 27, 2021 at 11:16:25AM +0200, Jerome Brunet wrote:
Mark, at this point I think it would be best to revert patches 1 and 5 while we work this out in CCF. The other patches are not affected. Sorry for the mess.
Sure, can someone send a patch with a changelog explaining the issue please?
On Tue 27 Apr 2021 at 12:27, Mark Brown <broonie@kernel.org> wrote:
On Tue, Apr 27, 2021 at 11:16:25AM +0200, Jerome Brunet wrote:
Mark, at this point I think it would be best to revert patches 1 and 5 while we work this out in CCF. The other patches are not affected. Sorry for the mess.
Sure, can someone send a patch with a changelog explaining the issue please?
Will do
On Wed, 21 Apr 2021 14:05:07 +0200, Jerome Brunet wrote:
The purpose of this patchset it remove the use the clk member of 'struct clk_hw' in ASoC. 'struct clk' is a per-user reference to an actual clock. In the future, the clk member in 'struct clk_hw' may go away.
The usage of this member by a clock provider usually falls into either of following categories: * Mis-usage of the clock consumer API by a clock provider. * Clock provider also being a user of its own clocks. In this case the provider should request a 'struct clk' through the appropriate API instead of poking in 'struct clk_hw' internals.
[...]
Applied to https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next Thanks! [1/5] ASoC: stm32: properly get clk from the provider commit: 65d1cce726d4912793d0a84c55ecdb0ef5832130 [2/5] ASoC: wcd934x: use the clock provider API commit: 104c3a9ed07411288efcd34f08a577df318aafc0 [3/5] ASoC: rt5682: clock driver must use the clock provider API commit: 8691743c511d6f92d7647d78ea1e5f5ef69937b1 [4/5] ASoC: lpass: use the clock provider API commit: 27dc72b44e85997dfd5f3b120e5ec847c43c272a [5/5] ASoC: da7219: properly get clk from the provider commit: 12f8127fe9e6154dd4197df97e44f3fd67583071 All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark
participants (3)
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Jerome Brunet -
Mark Brown -
Pierre-Louis Bossart