I have no way to test this problem but I was thinking along the lines of
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1862,6 +1862,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32
sdhci_runtime_pm_get(host);
disable_irq(host->irq);
+ sdhci_disable_card_detection(host);
spin_lock(&host->lock);
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
@@ -1883,6 +1884,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32
ctrl |= SDHCI_CTRL_EXEC_TUNING;
else {
spin_unlock(&host->lock);
+ sdhci_enable_card_detection(host);
enable_irq(host->irq);
sdhci_runtime_pm_put(host);
return 0;
@@ -1890,6 +1892,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32
if (host->ops->platform_execute_tuning) {
spin_unlock(&host->lock);
+ sdhci_enable_card_detection(host);
enable_irq(host->irq);
err = host->ops->platform_execute_tuning(host, opcode);
sdhci_runtime_pm_put(host);
@@ -2047,6 +2050,7 @@ out:
sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier);
spin_unlock(&host->lock);
+ sdhci_enable_card_detection(host);
enable_irq(host->irq);
sdhci_runtime_pm_put(host);
regards,
Philip
On Jan 20, 2014, at 9:51 AM, Philip Rakity <prakity@xxxxxxxxxx> wrote:
>
> Chris,
>
> The suggested fix can lock out interrupts for up to 150ms. There needs to be another way.
> So, I would strongly recommend we find another solution.
>
> Philip
>
> On Jan 17, 2014, at 7:57 PM, Andrew Bresticker <abrestic@xxxxxxxxxxxx> wrote:
>
>> sdhci_execute_tuning() takes host->lock without disabling interrupts.
>> Use spin_lock_irq{save,restore} instead so that we avoid taking an
>> interrupt and scheduling while holding host->lock.
>>
>> Signed-off-by: Andrew Bresticker <abrestic@xxxxxxxxxxxx>
>> ---
>> drivers/mmc/host/sdhci.c | 13 +++++++------
>> 1 file changed, 7 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index ec3eb30..84c80e7 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -1857,12 +1857,13 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>> unsigned long timeout;
>> int err = 0;
>> bool requires_tuning_nonuhs = false;
>> + unsigned long flags;
>>
>> host = mmc_priv(mmc);
>>
>> sdhci_runtime_pm_get(host);
>> disable_irq(host->irq);
>> - spin_lock(&host->lock);
>> + spin_lock_irqsave(&host->lock, flags);
>
>
> The disable_irq() call stops the controller from doing interrupts.
> Please explain what problem you are seeing
>
>>
>> ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
>>
>> @@ -1882,14 +1883,14 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>> requires_tuning_nonuhs)
>> ctrl |= SDHCI_CTRL_EXEC_TUNING;
>> else {
>> - spin_unlock(&host->lock);
>> + spin_unlock_irqrestore(&host->lock, flags);
>> enable_irq(host->irq);
>> sdhci_runtime_pm_put(host);
>> return 0;
>> }
>>
>> if (host->ops->platform_execute_tuning) {
>> - spin_unlock(&host->lock);
>> + spin_unlock_irqrestore(&host->lock, flags);
>> enable_irq(host->irq);
>> err = host->ops->platform_execute_tuning(host, opcode);
>> sdhci_runtime_pm_put(host);
>> @@ -1963,7 +1964,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>> host->cmd = NULL;
>> host->mrq = NULL;
>>
>> - spin_unlock(&host->lock);
>> + spin_unlock_irqrestore(&host->lock, flags);
>> enable_irq(host->irq);
>>
>> /* Wait for Buffer Read Ready interrupt */
>> @@ -1971,7 +1972,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
>> (host->tuning_done == 1),
>> msecs_to_jiffies(50));
>> disable_irq(host->irq);
>> - spin_lock(&host->lock);
>> + spin_lock_irqsave(&host->lock, flags);
>>
>> if (!host->tuning_done) {
>> pr_info(DRIVER_NAME ": Timeout waiting for "
>> @@ -2046,7 +2047,7 @@ out:
>> err = 0;
>>
>> sdhci_clear_set_irqs(host, SDHCI_INT_DATA_AVAIL, ier);
>> - spin_unlock(&host->lock);
>> + spin_unlock_irqrestore(&host->lock, flags);
>> enable_irq(host->irq);
>> sdhci_runtime_pm_put(host);
>>
>> --
>> 1.8.5.2
>>
>> --
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