Allow module parameter 'enable_msi' to request an MSI interrupt for
hosts where available (presently PCI). Useful as a workaround on
platforms where the legacy interrupt is broken.
Signed-off-by: Daniel J Blueman <[email protected]>
---
drivers/mmc/host/sdhci-pci.c | 30 ++++++++++++++++++++++++++++++
drivers/mmc/host/sdhci.c | 23 +++++++++++++++++++++++
drivers/mmc/host/sdhci.h | 2 ++
3 files changed, 55 insertions(+)
diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
index 504da71..fbde589 100644
--- a/drivers/mmc/host/sdhci-pci.c
+++ b/drivers/mmc/host/sdhci-pci.c
@@ -934,6 +934,34 @@ static int sdhci_pci_enable_dma(struct sdhci_host *host)
return 0;
}
+static int sdhci_pci_enable_msi(struct sdhci_host *host)
+{
+ struct sdhci_pci_slot *slot;
+ struct pci_dev *pdev;
+ int ret;
+
+ slot = sdhci_priv(host);
+ pdev = slot->chip->pdev;
+
+ ret = pci_enable_msi(pdev);
+ if (ret)
+ return ret;
+
+ host->irq = pdev->irq;
+ return 0;
+}
+
+static void sdhci_pci_disable_msi(struct sdhci_host *host)
+{
+ struct sdhci_pci_slot *slot;
+ struct pci_dev *pdev;
+
+ slot = sdhci_priv(host);
+ pdev = slot->chip->pdev;
+
+ pci_disable_msi(pdev);
+}
+
static int sdhci_pci_8bit_width(struct sdhci_host *host, int width)
{
u8 ctrl;
@@ -976,6 +1004,8 @@ static void sdhci_pci_hw_reset(struct sdhci_host *host)
static struct sdhci_ops sdhci_pci_ops = {
.enable_dma = sdhci_pci_enable_dma,
+ .enable_msi = sdhci_pci_enable_msi,
+ .disable_msi = sdhci_pci_disable_msi,
.platform_8bit_width = sdhci_pci_8bit_width,
.hw_reset = sdhci_pci_hw_reset,
};
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9a11dc3..9fa2180 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -45,6 +45,7 @@
static unsigned int debug_quirks = 0;
static unsigned int debug_quirks2;
+static bool enable_msi;
static void sdhci_finish_data(struct sdhci_host *);
@@ -2433,6 +2434,9 @@ int sdhci_suspend_host(struct sdhci_host *host)
free_irq(host->irq, host);
+ if (host->ops->disable_msi && enable_msi)
+ host->ops->disable_msi(host);
+
return ret;
}
@@ -2447,6 +2451,12 @@ int sdhci_resume_host(struct sdhci_host *host)
host->ops->enable_dma(host);
}
+ if (host->ops->enable_msi && enable_msi) {
+ ret = host->ops->enable_msi(host);
+ if (ret)
+ return ret;
+ }
+
ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
mmc_hostname(host->mmc), host);
if (ret)
@@ -3024,6 +3034,12 @@ int sdhci_add_host(struct sdhci_host *host)
host->tuning_timer.function = sdhci_tuning_timer;
}
+ if (host->ops->enable_msi && enable_msi) {
+ ret = host->ops->enable_msi(host);
+ if (ret)
+ return ret;
+ }
+
ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
mmc_hostname(mmc), host);
if (ret) {
@@ -3071,6 +3087,8 @@ int sdhci_add_host(struct sdhci_host *host)
reset:
sdhci_reset(host, SDHCI_RESET_ALL);
free_irq(host->irq, host);
+ if (host->ops->disable_msi && enable_msi)
+ host->ops->disable_msi(host);
#endif
untasklet:
tasklet_kill(&host->card_tasklet);
@@ -3114,6 +3132,9 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
free_irq(host->irq, host);
+ if (host->ops->disable_msi && enable_msi)
+ host->ops->disable_msi(host);
+
del_timer_sync(&host->timer);
tasklet_kill(&host->card_tasklet);
@@ -3162,6 +3183,7 @@ module_exit(sdhci_drv_exit);
module_param(debug_quirks, uint, 0444);
module_param(debug_quirks2, uint, 0444);
+module_param(enable_msi, bool, 0444);
MODULE_AUTHOR("Pierre Ossman <[email protected]>");
MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
@@ -3169,3 +3191,4 @@ MODULE_LICENSE("GPL");
MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
+MODULE_PARM_DESC(debug_quirks2, "Enable MSI interrupt support where possible.");
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 97653ea..df4e003 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -264,6 +264,8 @@ struct sdhci_ops {
void (*set_clock)(struct sdhci_host *host, unsigned int clock);
int (*enable_dma)(struct sdhci_host *host);
+ int (*enable_msi)(struct sdhci_host *host);
+ void (*disable_msi)(struct sdhci_host *host);
unsigned int (*get_max_clock)(struct sdhci_host *host);
unsigned int (*get_min_clock)(struct sdhci_host *host);
unsigned int (*get_timeout_clock)(struct sdhci_host *host);
--
1.7.10.4
The interrupt source could be from a non-pci device. Say a gpio or whatever.
Does it make sense to break this patch into two patches ?
On Aug 17, 2012, at 2:14 AM, Daniel J Blueman <[email protected]> wrote:
> Allow module parameter 'enable_msi' to request an MSI interrupt for
> hosts where available (presently PCI). Useful as a workaround on
> platforms where the legacy interrupt is broken.
>
> Signed-off-by: Daniel J Blueman <[email protected]>
> ---
> drivers/mmc/host/sdhci-pci.c | 30 ++++++++++++++++++++++++++++++
> drivers/mmc/host/sdhci.c | 23 +++++++++++++++++++++++
> drivers/mmc/host/sdhci.h | 2 ++
> 3 files changed, 55 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
> index 504da71..fbde589 100644
> --- a/drivers/mmc/host/sdhci-pci.c
> +++ b/drivers/mmc/host/sdhci-pci.c
> @@ -934,6 +934,34 @@ static int sdhci_pci_enable_dma(struct sdhci_host *host)
> return 0;
> }
>
> +static int sdhci_pci_enable_msi(struct sdhci_host *host)
> +{
> + struct sdhci_pci_slot *slot;
> + struct pci_dev *pdev;
> + int ret;
> +
> + slot = sdhci_priv(host);
> + pdev = slot->chip->pdev;
> +
> + ret = pci_enable_msi(pdev);
> + if (ret)
> + return ret;
> +
> + host->irq = pdev->irq;
> + return 0;
> +}
> +
> +static void sdhci_pci_disable_msi(struct sdhci_host *host)
> +{
> + struct sdhci_pci_slot *slot;
> + struct pci_dev *pdev;
> +
> + slot = sdhci_priv(host);
> + pdev = slot->chip->pdev;
> +
> + pci_disable_msi(pdev);
> +}
> +
> static int sdhci_pci_8bit_width(struct sdhci_host *host, int width)
> {
> u8 ctrl;
> @@ -976,6 +1004,8 @@ static void sdhci_pci_hw_reset(struct sdhci_host *host)
>
> static struct sdhci_ops sdhci_pci_ops = {
> .enable_dma = sdhci_pci_enable_dma,
> + .enable_msi = sdhci_pci_enable_msi,
> + .disable_msi = sdhci_pci_disable_msi,
> .platform_8bit_width = sdhci_pci_8bit_width,
> .hw_reset = sdhci_pci_hw_reset,
> };
> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
> index 9a11dc3..9fa2180 100644
> --- a/drivers/mmc/host/sdhci.c
> +++ b/drivers/mmc/host/sdhci.c
> @@ -45,6 +45,7 @@
>
> static unsigned int debug_quirks = 0;
> static unsigned int debug_quirks2;
> +static bool enable_msi;
>
> static void sdhci_finish_data(struct sdhci_host *);
>
> @@ -2433,6 +2434,9 @@ int sdhci_suspend_host(struct sdhci_host *host)
>
> free_irq(host->irq, host);
>
> + if (host->ops->disable_msi && enable_msi)
> + host->ops->disable_msi(host);
> +
> return ret;
> }
>
> @@ -2447,6 +2451,12 @@ int sdhci_resume_host(struct sdhci_host *host)
> host->ops->enable_dma(host);
> }
>
> + if (host->ops->enable_msi && enable_msi) {
> + ret = host->ops->enable_msi(host);
> + if (ret)
> + return ret;
> + }
> +
> ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
> mmc_hostname(host->mmc), host);
> if (ret)
> @@ -3024,6 +3034,12 @@ int sdhci_add_host(struct sdhci_host *host)
> host->tuning_timer.function = sdhci_tuning_timer;
> }
>
> + if (host->ops->enable_msi && enable_msi) {
> + ret = host->ops->enable_msi(host);
> + if (ret)
> + return ret;
> + }
> +
> ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
> mmc_hostname(mmc), host);
> if (ret) {
> @@ -3071,6 +3087,8 @@ int sdhci_add_host(struct sdhci_host *host)
> reset:
> sdhci_reset(host, SDHCI_RESET_ALL);
> free_irq(host->irq, host);
> + if (host->ops->disable_msi && enable_msi)
> + host->ops->disable_msi(host);
> #endif
> untasklet:
> tasklet_kill(&host->card_tasklet);
> @@ -3114,6 +3132,9 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
>
> free_irq(host->irq, host);
>
> + if (host->ops->disable_msi && enable_msi)
> + host->ops->disable_msi(host);
> +
> del_timer_sync(&host->timer);
>
> tasklet_kill(&host->card_tasklet);
> @@ -3162,6 +3183,7 @@ module_exit(sdhci_drv_exit);
>
> module_param(debug_quirks, uint, 0444);
> module_param(debug_quirks2, uint, 0444);
> +module_param(enable_msi, bool, 0444);
>
> MODULE_AUTHOR("Pierre Ossman <[email protected]>");
> MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
> @@ -3169,3 +3191,4 @@ MODULE_LICENSE("GPL");
>
> MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
> MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
> +MODULE_PARM_DESC(debug_quirks2, "Enable MSI interrupt support where possible.");
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index 97653ea..df4e003 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -264,6 +264,8 @@ struct sdhci_ops {
> void (*set_clock)(struct sdhci_host *host, unsigned int clock);
>
> int (*enable_dma)(struct sdhci_host *host);
> + int (*enable_msi)(struct sdhci_host *host);
> + void (*disable_msi)(struct sdhci_host *host);
> unsigned int (*get_max_clock)(struct sdhci_host *host);
> unsigned int (*get_min_clock)(struct sdhci_host *host);
> unsigned int (*get_timeout_clock)(struct sdhci_host *host);
> --
> 1.7.10.4
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
> the body of a message to [email protected]
> More majordomo info at http://vger.kernel.org/majordomo-info.html
Hi Philip,
The interrupt could be from another source, though Message Signalled
Interrupts are a PCI (and variants) only feature at present. I'm happy
to split the patch and/or make the module param specific to sdhci-pci.
Let's see what the maintainers prefer...Chris?
Dan
On 18 August 2012 00:35, Philip Rakity <[email protected]> wrote:
>
> The interrupt source could be from a non-pci device. Say a gpio or whatever.
> Does it make sense to break this patch into two patches ?
>
> On Aug 17, 2012, at 2:14 AM, Daniel J Blueman <[email protected]> wrote:
>
>> Allow module parameter 'enable_msi' to request an MSI interrupt for
>> hosts where available (presently PCI). Useful as a workaround on
>> platforms where the legacy interrupt is broken.
>>
>> Signed-off-by: Daniel J Blueman <[email protected]>
>> ---
>> drivers/mmc/host/sdhci-pci.c | 30 ++++++++++++++++++++++++++++++
>> drivers/mmc/host/sdhci.c | 23 +++++++++++++++++++++++
>> drivers/mmc/host/sdhci.h | 2 ++
>> 3 files changed, 55 insertions(+)
>>
>> diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
>> index 504da71..fbde589 100644
>> --- a/drivers/mmc/host/sdhci-pci.c
>> +++ b/drivers/mmc/host/sdhci-pci.c
>> @@ -934,6 +934,34 @@ static int sdhci_pci_enable_dma(struct sdhci_host *host)
>> return 0;
>> }
>>
>> +static int sdhci_pci_enable_msi(struct sdhci_host *host)
>> +{
>> + struct sdhci_pci_slot *slot;
>> + struct pci_dev *pdev;
>> + int ret;
>> +
>> + slot = sdhci_priv(host);
>> + pdev = slot->chip->pdev;
>> +
>> + ret = pci_enable_msi(pdev);
>> + if (ret)
>> + return ret;
>> +
>> + host->irq = pdev->irq;
>> + return 0;
>> +}
>> +
>> +static void sdhci_pci_disable_msi(struct sdhci_host *host)
>> +{
>> + struct sdhci_pci_slot *slot;
>> + struct pci_dev *pdev;
>> +
>> + slot = sdhci_priv(host);
>> + pdev = slot->chip->pdev;
>> +
>> + pci_disable_msi(pdev);
>> +}
>> +
>> static int sdhci_pci_8bit_width(struct sdhci_host *host, int width)
>> {
>> u8 ctrl;
>> @@ -976,6 +1004,8 @@ static void sdhci_pci_hw_reset(struct sdhci_host *host)
>>
>> static struct sdhci_ops sdhci_pci_ops = {
>> .enable_dma = sdhci_pci_enable_dma,
>> + .enable_msi = sdhci_pci_enable_msi,
>> + .disable_msi = sdhci_pci_disable_msi,
>> .platform_8bit_width = sdhci_pci_8bit_width,
>> .hw_reset = sdhci_pci_hw_reset,
>> };
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index 9a11dc3..9fa2180 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -45,6 +45,7 @@
>>
>> static unsigned int debug_quirks = 0;
>> static unsigned int debug_quirks2;
>> +static bool enable_msi;
>>
>> static void sdhci_finish_data(struct sdhci_host *);
>>
>> @@ -2433,6 +2434,9 @@ int sdhci_suspend_host(struct sdhci_host *host)
>>
>> free_irq(host->irq, host);
>>
>> + if (host->ops->disable_msi && enable_msi)
>> + host->ops->disable_msi(host);
>> +
>> return ret;
>> }
>>
>> @@ -2447,6 +2451,12 @@ int sdhci_resume_host(struct sdhci_host *host)
>> host->ops->enable_dma(host);
>> }
>>
>> + if (host->ops->enable_msi && enable_msi) {
>> + ret = host->ops->enable_msi(host);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
>> mmc_hostname(host->mmc), host);
>> if (ret)
>> @@ -3024,6 +3034,12 @@ int sdhci_add_host(struct sdhci_host *host)
>> host->tuning_timer.function = sdhci_tuning_timer;
>> }
>>
>> + if (host->ops->enable_msi && enable_msi) {
>> + ret = host->ops->enable_msi(host);
>> + if (ret)
>> + return ret;
>> + }
>> +
>> ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
>> mmc_hostname(mmc), host);
>> if (ret) {
>> @@ -3071,6 +3087,8 @@ int sdhci_add_host(struct sdhci_host *host)
>> reset:
>> sdhci_reset(host, SDHCI_RESET_ALL);
>> free_irq(host->irq, host);
>> + if (host->ops->disable_msi && enable_msi)
>> + host->ops->disable_msi(host);
>> #endif
>> untasklet:
>> tasklet_kill(&host->card_tasklet);
>> @@ -3114,6 +3132,9 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
>>
>> free_irq(host->irq, host);
>>
>> + if (host->ops->disable_msi && enable_msi)
>> + host->ops->disable_msi(host);
>> +
>> del_timer_sync(&host->timer);
>>
>> tasklet_kill(&host->card_tasklet);
>> @@ -3162,6 +3183,7 @@ module_exit(sdhci_drv_exit);
>>
>> module_param(debug_quirks, uint, 0444);
>> module_param(debug_quirks2, uint, 0444);
>> +module_param(enable_msi, bool, 0444);
>>
>> MODULE_AUTHOR("Pierre Ossman <[email protected]>");
>> MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
>> @@ -3169,3 +3191,4 @@ MODULE_LICENSE("GPL");
>>
>> MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
>> MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
>> +MODULE_PARM_DESC(debug_quirks2, "Enable MSI interrupt support where possible.");
>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
>> index 97653ea..df4e003 100644
>> --- a/drivers/mmc/host/sdhci.h
>> +++ b/drivers/mmc/host/sdhci.h
>> @@ -264,6 +264,8 @@ struct sdhci_ops {
>> void (*set_clock)(struct sdhci_host *host, unsigned int clock);
>>
>> int (*enable_dma)(struct sdhci_host *host);
>> + int (*enable_msi)(struct sdhci_host *host);
>> + void (*disable_msi)(struct sdhci_host *host);
>> unsigned int (*get_max_clock)(struct sdhci_host *host);
>> unsigned int (*get_min_clock)(struct sdhci_host *host);
>> unsigned int (*get_timeout_clock)(struct sdhci_host *host);
>> --
>> 1.7.10.4
>>
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
>> the body of a message to [email protected]
>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
--
Daniel J Blueman
Hello,
On 08/18/2012 01:06 PM, Daniel J Blueman wrote:
> Hi Philip,
>
> The interrupt could be from another source, though Message Signalled
> Interrupts are a PCI (and variants) only feature at present. I'm happy
> to split the patch and/or make the module param specific to sdhci-pci.
Not sure if you are aware of the following thread:
http://marc.info/?l=linux-mmc&m=133346937412708&w=2
Enabling msi will break some systems.
And more comments below.
>
> Let's see what the maintainers prefer...Chris?
>
> Dan
>
> On 18 August 2012 00:35, Philip Rakity <[email protected]> wrote:
>>
>> The interrupt source could be from a non-pci device. Say a gpio or whatever.
>> Does it make sense to break this patch into two patches ?
>>
>> On Aug 17, 2012, at 2:14 AM, Daniel J Blueman <[email protected]> wrote:
>>
>>> Allow module parameter 'enable_msi' to request an MSI interrupt for
>>> hosts where available (presently PCI). Useful as a workaround on
>>> platforms where the legacy interrupt is broken.
>>>
>>> Signed-off-by: Daniel J Blueman <[email protected]>
>>> ---
>>> drivers/mmc/host/sdhci-pci.c | 30 ++++++++++++++++++++++++++++++
>>> drivers/mmc/host/sdhci.c | 23 +++++++++++++++++++++++
>>> drivers/mmc/host/sdhci.h | 2 ++
>>> 3 files changed, 55 insertions(+)
>>>
>>> diff --git a/drivers/mmc/host/sdhci-pci.c b/drivers/mmc/host/sdhci-pci.c
>>> index 504da71..fbde589 100644
>>> --- a/drivers/mmc/host/sdhci-pci.c
>>> +++ b/drivers/mmc/host/sdhci-pci.c
>>> @@ -934,6 +934,34 @@ static int sdhci_pci_enable_dma(struct sdhci_host *host)
>>> return 0;
>>> }
>>>
>>> +static int sdhci_pci_enable_msi(struct sdhci_host *host)
>>> +{
>>> + struct sdhci_pci_slot *slot;
>>> + struct pci_dev *pdev;
>>> + int ret;
>>> +
>>> + slot = sdhci_priv(host);
>>> + pdev = slot->chip->pdev;
>>> +
>>> + ret = pci_enable_msi(pdev);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + host->irq = pdev->irq;
>>> + return 0;
>>> +}
>>> +
>>> +static void sdhci_pci_disable_msi(struct sdhci_host *host)
>>> +{
>>> + struct sdhci_pci_slot *slot;
>>> + struct pci_dev *pdev;
>>> +
>>> + slot = sdhci_priv(host);
>>> + pdev = slot->chip->pdev;
>>> +
>>> + pci_disable_msi(pdev);
>>> +}
>>> +
>>> static int sdhci_pci_8bit_width(struct sdhci_host *host, int width)
>>> {
>>> u8 ctrl;
>>> @@ -976,6 +1004,8 @@ static void sdhci_pci_hw_reset(struct sdhci_host *host)
>>>
>>> static struct sdhci_ops sdhci_pci_ops = {
>>> .enable_dma = sdhci_pci_enable_dma,
>>> + .enable_msi = sdhci_pci_enable_msi,
>>> + .disable_msi = sdhci_pci_disable_msi,
>>> .platform_8bit_width = sdhci_pci_8bit_width,
>>> .hw_reset = sdhci_pci_hw_reset,
>>> };
>>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>>> index 9a11dc3..9fa2180 100644
>>> --- a/drivers/mmc/host/sdhci.c
>>> +++ b/drivers/mmc/host/sdhci.c
>>> @@ -45,6 +45,7 @@
>>>
>>> static unsigned int debug_quirks = 0;
>>> static unsigned int debug_quirks2;
>>> +static bool enable_msi;
>>>
>>> static void sdhci_finish_data(struct sdhci_host *);
>>>
>>> @@ -2433,6 +2434,9 @@ int sdhci_suspend_host(struct sdhci_host *host)
>>>
>>> free_irq(host->irq, host);
>>>
>>> + if (host->ops->disable_msi && enable_msi)
>>> + host->ops->disable_msi(host);
>>> +
Don't know why msi needs to be disabled/enabled on suspend/resume.
And doing this in sdhci_pci_suspend/resume might be more appropriate if
required.
Thanks,
Aaron
>>> return ret;
>>> }
>>>
>>> @@ -2447,6 +2451,12 @@ int sdhci_resume_host(struct sdhci_host *host)
>>> host->ops->enable_dma(host);
>>> }
>>>
>>> + if (host->ops->enable_msi && enable_msi) {
>>> + ret = host->ops->enable_msi(host);
>>> + if (ret)
>>> + return ret;
>>> + }
>>> +
>>> ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
>>> mmc_hostname(host->mmc), host);
>>> if (ret)
>>> @@ -3024,6 +3034,12 @@ int sdhci_add_host(struct sdhci_host *host)
>>> host->tuning_timer.function = sdhci_tuning_timer;
>>> }
>>>
>>> + if (host->ops->enable_msi && enable_msi) {
>>> + ret = host->ops->enable_msi(host);
>>> + if (ret)
>>> + return ret;
>>> + }
>>> +
>>> ret = request_irq(host->irq, sdhci_irq, IRQF_SHARED,
>>> mmc_hostname(mmc), host);
>>> if (ret) {
>>> @@ -3071,6 +3087,8 @@ int sdhci_add_host(struct sdhci_host *host)
>>> reset:
>>> sdhci_reset(host, SDHCI_RESET_ALL);
>>> free_irq(host->irq, host);
>>> + if (host->ops->disable_msi && enable_msi)
>>> + host->ops->disable_msi(host);
>>> #endif
>>> untasklet:
>>> tasklet_kill(&host->card_tasklet);
>>> @@ -3114,6 +3132,9 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
>>>
>>> free_irq(host->irq, host);
>>>
>>> + if (host->ops->disable_msi && enable_msi)
>>> + host->ops->disable_msi(host);
>>> +
>>> del_timer_sync(&host->timer);
>>>
>>> tasklet_kill(&host->card_tasklet);
>>> @@ -3162,6 +3183,7 @@ module_exit(sdhci_drv_exit);
>>>
>>> module_param(debug_quirks, uint, 0444);
>>> module_param(debug_quirks2, uint, 0444);
>>> +module_param(enable_msi, bool, 0444);
>>>
>>> MODULE_AUTHOR("Pierre Ossman <[email protected]>");
>>> MODULE_DESCRIPTION("Secure Digital Host Controller Interface core driver");
>>> @@ -3169,3 +3191,4 @@ MODULE_LICENSE("GPL");
>>>
>>> MODULE_PARM_DESC(debug_quirks, "Force certain quirks.");
>>> MODULE_PARM_DESC(debug_quirks2, "Force certain other quirks.");
>>> +MODULE_PARM_DESC(debug_quirks2, "Enable MSI interrupt support where possible.");
>>> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
>>> index 97653ea..df4e003 100644
>>> --- a/drivers/mmc/host/sdhci.h
>>> +++ b/drivers/mmc/host/sdhci.h
>>> @@ -264,6 +264,8 @@ struct sdhci_ops {
>>> void (*set_clock)(struct sdhci_host *host, unsigned int clock);
>>>
>>> int (*enable_dma)(struct sdhci_host *host);
>>> + int (*enable_msi)(struct sdhci_host *host);
>>> + void (*disable_msi)(struct sdhci_host *host);
>>> unsigned int (*get_max_clock)(struct sdhci_host *host);
>>> unsigned int (*get_min_clock)(struct sdhci_host *host);
>>> unsigned int (*get_timeout_clock)(struct sdhci_host *host);
>>> --
>>> 1.7.10.4
>>>
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe linux-mmc" in
>>> the body of a message to [email protected]
>>> More majordomo info at http://vger.kernel.org/majordomo-info.html
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