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Date: Sat, 18 Aug 2012 13:06:07 +0800
From: Daniel J Blueman <daniel@...ra.org>
To: Philip Rakity <prakity@...vell.com>, Chris Ball <cjb@...top.org>
Cc: "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Add MSI support for SDHCI PCI hosts
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 <prakity@...vell.com> 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 <daniel@...ra.org> 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 <daniel@...ra.org>
>> ---
>> 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 <pierre@...man.eu>");
>> 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
>>
>> --
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>
--
Daniel J Blueman
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