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SubjectRe: [PATCH] mmc: sdhci-pxav3: don't disable clocks when we might get an interrupt
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On 15/05/18 09:18, Tom Hebb wrote:
> Hi,
>
> On 05/15/2018 01:59 AM, Adrian Hunter wrote:
>> On 15/05/18 00:56, Thomas Hebb wrote:
>>> Currently, runtime_suspend() unconditionally disables the clock gates
>>> for the controller, which means that it's unable to receive interrupts
>>> generated by connected SDIO cards.
>>
>> We currently get / put runtime pm with enable / disable of the SDIO IRQ
>> (refer sdhci_enable_sdio_irq()) so are you sure this is needed?
>
> You're correct; this patch is unnecessary. I wrote it before
> 923713b35745 ("mmc: sdhci: Disable runtime pm when the sdio_irq is
> enabled"), and it was needed then. Sorry for the noise.
>
> FYI, sdhci-esdhc-imx still checks the IRQ in its suspend/resume
> functions. That's one of the things that misled me to think this patch
> was still relevant.

+ a few people that have worked on sdhci-esdhc-imx

>
>>>
>>> Signed-off-by: Thomas Hebb <tommyhebb@gmail.com>
>>> ---
>>> drivers/mmc/host/sdhci-pxav3.c | 16 ++++++++++------
>>> 1 file changed, 10 insertions(+), 6 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/sdhci-pxav3.c b/drivers/mmc/host/sdhci-pxav3.c
>>> index a34434166ca7..59760f3cc1d7 100644
>>> --- a/drivers/mmc/host/sdhci-pxav3.c
>>> +++ b/drivers/mmc/host/sdhci-pxav3.c
>>> @@ -562,9 +562,11 @@ static int sdhci_pxav3_runtime_suspend(struct device *dev)
>>> if (host->tuning_mode != SDHCI_TUNING_MODE_3)
>>> mmc_retune_needed(host->mmc);
>>>
>>> - clk_disable_unprepare(pxa->clk_io);
>>> - if (!IS_ERR(pxa->clk_core))
>>> - clk_disable_unprepare(pxa->clk_core);
>>> + if (!sdhci_sdio_irq_enabled(host)) {
>>> + clk_disable_unprepare(pxa->clk_io);
>>> + if (!IS_ERR(pxa->clk_core))
>>> + clk_disable_unprepare(pxa->clk_core);
>>> + }
>>>
>>> return 0;
>>> }
>>> @@ -575,9 +577,11 @@ static int sdhci_pxav3_runtime_resume(struct device *dev)
>>> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>>> struct sdhci_pxa *pxa = sdhci_pltfm_priv(pltfm_host);
>>>
>>> - clk_prepare_enable(pxa->clk_io);
>>> - if (!IS_ERR(pxa->clk_core))
>>> - clk_prepare_enable(pxa->clk_core);
>>> + if (!sdhci_sdio_irq_enabled(host)) {
>>> + clk_prepare_enable(pxa->clk_io);
>>> + if (!IS_ERR(pxa->clk_core))
>>> + clk_prepare_enable(pxa->clk_core);
>>> + }
>>>
>>> return sdhci_runtime_resume_host(host);
>>> }
>>>
>>
>

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