Hi Andreas
On Mon, Nov 11, 2013 at 9:06 PM, Andreas Fenkart <afenkart@xxxxxxxxx> wrote:
> For now, only support SDIO interrupt if we are booted with
> DT. This is because some platforms need special quirks. And
> we don't want to add new legacy mux platform init code
> callbacks any longer as we are moving to DT based booting
> anyways.
>
> Broken hardware, missing the swakueup line, should fallback
> to polling, by setting 'ti,quirk-swakup-missing' in the
> device tree. Otherwise pending SDIO IRQ are not detected
> while in suspend. This affects am33xx processors.
>
> For the DT-Binding portion:
> Reviewed-by: Grant Likely <grant.likely@xxxxxxxxxxxx>
> Acked-by: Kumar Gala <galak@xxxxxxxxxxxxxx>
> Signed-off-by: Andreas Fenkart <afenkart@xxxxxxxxx>
> ---
I think that you should add patch revision, change log description.
Michael
> .../devicetree/bindings/mmc/ti-omap-hsmmc.txt | 18 ++++
> drivers/mmc/host/omap_hsmmc.c | 86 ++++++++++++++++++--
> 2 files changed, 95 insertions(+), 9 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> index ed271fc..1136e6b 100644
> --- a/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> +++ b/Documentation/devicetree/bindings/mmc/ti-omap-hsmmc.txt
> @@ -20,6 +20,24 @@ ti,dual-volt: boolean, supports dual voltage cards
> ti,non-removable: non-removable slot (like eMMC)
> ti,needs-special-reset: Requires a special softreset sequence
> ti,needs-special-hs-handling: HSMMC IP needs special setting for handling High Speed
> +ti,quirk-swakup-missing: SOC missing the swakeup line, will not detect
> +SDIO irq while in suspend. Fallback to polling. Affected chips are
> +am335x,
> +
> + ------
> + | PRCM |
> + ------
> + ^ |
> + swakeup | | fclk
> + | v
> + ------ ------- -----
> + | card | -- CIRQ --> | hsmmc | -- IRQ --> | CPU |
> + ------ ------- -----
> +
> +In suspend the fclk is off and the module is disfunctional. Even
> +register reads will fail. A small logic in the host will request fclk
> +restore, when an external event is detected. Once the clock is
> +restored, the host detects the event normally.
>
> Example:
> mmc1: mmc@0x4809c000 {
> diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
> index b392130..6b0ec55 100644
> --- a/drivers/mmc/host/omap_hsmmc.c
> +++ b/drivers/mmc/host/omap_hsmmc.c
> @@ -130,6 +130,7 @@ static void apply_clk_hack(struct device *dev)
> #define TC_EN (1 << 1)
> #define BWR_EN (1 << 4)
> #define BRR_EN (1 << 5)
> +#define CIRQ_EN (1 << 8)
> #define ERR_EN (1 << 15)
> #define CTO_EN (1 << 16)
> #define CCRC_EN (1 << 17)
> @@ -210,6 +211,9 @@ struct omap_hsmmc_host {
> int reqs_blocked;
> int use_reg;
> int req_in_progress;
> + int flags;
> +#define HSMMC_SDIO_IRQ_ENABLED (1 << 0) /* SDIO irq enabled */
> +
> struct omap_hsmmc_next next_data;
> struct omap_mmc_platform_data *pdata;
> };
> @@ -490,27 +494,40 @@ static void omap_hsmmc_stop_clock(struct omap_hsmmc_host *host)
> static void omap_hsmmc_enable_irq(struct omap_hsmmc_host *host,
> struct mmc_command *cmd)
> {
> - unsigned int irq_mask;
> + u32 irq_mask = INT_EN_MASK;
> + unsigned long flags;
>
> if (host->use_dma)
> - irq_mask = INT_EN_MASK & ~(BRR_EN | BWR_EN);
> - else
> - irq_mask = INT_EN_MASK;
> + irq_mask &= ~(BRR_EN | BWR_EN);
>
> /* Disable timeout for erases */
> if (cmd->opcode == MMC_ERASE)
> irq_mask &= ~DTO_EN;
>
> + spin_lock_irqsave(&host->irq_lock, flags);
> OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
> OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
> +
> + /* latch pending CIRQ, but don't signal */
> + if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
> + irq_mask |= CIRQ_EN;
> OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
> + spin_unlock_irqrestore(&host->irq_lock, flags);
> }
>
> static void omap_hsmmc_disable_irq(struct omap_hsmmc_host *host)
> {
> - OMAP_HSMMC_WRITE(host->base, ISE, 0);
> - OMAP_HSMMC_WRITE(host->base, IE, 0);
> + u32 irq_mask = 0;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&host->irq_lock, flags);
> + /* no transfer running, need to signal cirq if enabled */
> + if (host->flags & HSMMC_SDIO_IRQ_ENABLED)
> + irq_mask |= CIRQ_EN;
> + OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
> + OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
> OMAP_HSMMC_WRITE(host->base, STAT, STAT_CLEAR);
> + spin_unlock_irqrestore(&host->irq_lock, flags);
> }
>
> /* Calculate divisor for the given clock frequency */
> @@ -1067,8 +1084,12 @@ static irqreturn_t omap_hsmmc_irq(int irq, void *dev_id)
> int status;
>
> status = OMAP_HSMMC_READ(host->base, STAT);
> - while (status & INT_EN_MASK && host->req_in_progress) {
> - omap_hsmmc_do_irq(host, status);
> + while (status & (INT_EN_MASK | CIRQ_EN)) {
> + if (host->req_in_progress)
> + omap_hsmmc_do_irq(host, status);
> +
> + if (status & CIRQ_EN)
> + mmc_signal_sdio_irq(host->mmc);
>
> /* Flush posted write */
> status = OMAP_HSMMC_READ(host->base, STAT);
> @@ -1583,6 +1604,37 @@ static void omap_hsmmc_init_card(struct mmc_host *mmc, struct mmc_card *card)
> mmc_slot(host).init_card(card);
> }
>
> +static void omap_hsmmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
> +{
> + struct omap_hsmmc_host *host = mmc_priv(mmc);
> + u32 irq_mask;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&host->irq_lock, flags);
> +
> + irq_mask = OMAP_HSMMC_READ(host->base, ISE);
> + if (enable) {
> + host->flags |= HSMMC_SDIO_IRQ_ENABLED;
> + irq_mask |= CIRQ_EN;
> + } else {
> + host->flags &= ~HSMMC_SDIO_IRQ_ENABLED;
> + irq_mask &= ~CIRQ_EN;
> + }
> + OMAP_HSMMC_WRITE(host->base, IE, irq_mask);
> +
> + /*
> + * if enable, piggy back detection on current request
> + * but always disable immediately
> + */
> + if (!host->req_in_progress || !enable)
> + OMAP_HSMMC_WRITE(host->base, ISE, irq_mask);
> +
> + /* flush posted write */
> + OMAP_HSMMC_READ(host->base, IE);
> +
> + spin_unlock_irqrestore(&host->irq_lock, flags);
> +}
> +
> static void omap_hsmmc_conf_bus_power(struct omap_hsmmc_host *host)
> {
> u32 hctl, capa, value;
> @@ -1635,7 +1687,7 @@ static const struct mmc_host_ops omap_hsmmc_ops = {
> .get_cd = omap_hsmmc_get_cd,
> .get_ro = omap_hsmmc_get_ro,
> .init_card = omap_hsmmc_init_card,
> - /* NYET -- enable_sdio_irq */
> + .enable_sdio_irq = omap_hsmmc_enable_sdio_irq,
> };
>
> #ifdef CONFIG_DEBUG_FS
> @@ -2021,6 +2073,22 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
> dev_warn(&pdev->dev,
> "pins are not configured from the driver\n");
>
> + /*
> + * For now, only support SDIO interrupt if we are booted with
> + * DT. This is because some platforms need special quirks. And
> + * we don't want to add new legacy mux platform init code
> + * callbacks any longer as we are moving to DT based booting
> + * anyways.
> + */
> + if (pdev->dev.of_node) {
> + mmc->caps |= MMC_CAP_SDIO_IRQ;
> + if (of_find_property(host->dev->of_node,
> + "ti,quirk-swakeup-missing", NULL)) {
> + /* no wakeup from deeper power states, use polling */
> + mmc->caps &= ~MMC_CAP_SDIO_IRQ;
> + }
> + }
> +
> omap_hsmmc_protect_card(host);
>
> mmc_add_host(mmc);
> --
> 1.7.10.4
>
> --
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