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SubjectRe: [PATCH] Add MSI support for SDHCI PCI hosts

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@quora.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@quora.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@ossman.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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