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SubjectRe: [PATCH V13 06/10] mmc: sdhci-pci: Add CQHCI support for Intel GLK
On 3 November 2017 at 14:20, Adrian Hunter <adrian.hunter@intel.com> wrote:
> Add CQHCI initialization and implement CQHCI operations for Intel GLK.
>
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>

This looks good to me!

Kind regards
Uffe

> ---
> drivers/mmc/host/Kconfig | 1 +
> drivers/mmc/host/sdhci-pci-core.c | 155 +++++++++++++++++++++++++++++++++++++-
> 2 files changed, 155 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
> index 3092b7085cb5..2b02a9788bb6 100644
> --- a/drivers/mmc/host/Kconfig
> +++ b/drivers/mmc/host/Kconfig
> @@ -81,6 +81,7 @@ config MMC_SDHCI_BIG_ENDIAN_32BIT_BYTE_SWAPPER
> config MMC_SDHCI_PCI
> tristate "SDHCI support on PCI bus"
> depends on MMC_SDHCI && PCI
> + select MMC_CQHCI
> help
> This selects the PCI Secure Digital Host Controller Interface.
> Most controllers found today are PCI devices.
> diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
> index 3e4f04fd5175..110c634cfb43 100644
> --- a/drivers/mmc/host/sdhci-pci-core.c
> +++ b/drivers/mmc/host/sdhci-pci-core.c
> @@ -30,6 +30,8 @@
> #include <linux/mmc/sdhci-pci-data.h>
> #include <linux/acpi.h>
>
> +#include "cqhci.h"
> +
> #include "sdhci.h"
> #include "sdhci-pci.h"
>
> @@ -116,6 +118,28 @@ int sdhci_pci_resume_host(struct sdhci_pci_chip *chip)
>
> return 0;
> }
> +
> +static int sdhci_cqhci_suspend(struct sdhci_pci_chip *chip)
> +{
> + int ret;
> +
> + ret = cqhci_suspend(chip->slots[0]->host->mmc);
> + if (ret)
> + return ret;
> +
> + return sdhci_pci_suspend_host(chip);
> +}
> +
> +static int sdhci_cqhci_resume(struct sdhci_pci_chip *chip)
> +{
> + int ret;
> +
> + ret = sdhci_pci_resume_host(chip);
> + if (ret)
> + return ret;
> +
> + return cqhci_resume(chip->slots[0]->host->mmc);
> +}
> #endif
>
> #ifdef CONFIG_PM
> @@ -166,8 +190,48 @@ static int sdhci_pci_runtime_resume_host(struct sdhci_pci_chip *chip)
>
> return 0;
> }
> +
> +static int sdhci_cqhci_runtime_suspend(struct sdhci_pci_chip *chip)
> +{
> + int ret;
> +
> + ret = cqhci_suspend(chip->slots[0]->host->mmc);
> + if (ret)
> + return ret;
> +
> + return sdhci_pci_runtime_suspend_host(chip);
> +}
> +
> +static int sdhci_cqhci_runtime_resume(struct sdhci_pci_chip *chip)
> +{
> + int ret;
> +
> + ret = sdhci_pci_runtime_resume_host(chip);
> + if (ret)
> + return ret;
> +
> + return cqhci_resume(chip->slots[0]->host->mmc);
> +}
> #endif
>
> +static u32 sdhci_cqhci_irq(struct sdhci_host *host, u32 intmask)
> +{
> + int cmd_error = 0;
> + int data_error = 0;
> +
> + if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error))
> + return intmask;
> +
> + cqhci_irq(host->mmc, intmask, cmd_error, data_error);
> +
> + return 0;
> +}
> +
> +static void sdhci_pci_dumpregs(struct mmc_host *mmc)
> +{
> + sdhci_dumpregs(mmc_priv(mmc));
> +}
> +
> /*****************************************************************************\
> * *
> * Hardware specific quirk handling *
> @@ -583,6 +647,18 @@ static void sdhci_intel_voltage_switch(struct sdhci_host *host)
> .voltage_switch = sdhci_intel_voltage_switch,
> };
>
> +static const struct sdhci_ops sdhci_intel_glk_ops = {
> + .set_clock = sdhci_set_clock,
> + .set_power = sdhci_intel_set_power,
> + .enable_dma = sdhci_pci_enable_dma,
> + .set_bus_width = sdhci_set_bus_width,
> + .reset = sdhci_reset,
> + .set_uhs_signaling = sdhci_set_uhs_signaling,
> + .hw_reset = sdhci_pci_hw_reset,
> + .voltage_switch = sdhci_intel_voltage_switch,
> + .irq = sdhci_cqhci_irq,
> +};
> +
> static void byt_read_dsm(struct sdhci_pci_slot *slot)
> {
> struct intel_host *intel_host = sdhci_pci_priv(slot);
> @@ -612,12 +688,80 @@ static int glk_emmc_probe_slot(struct sdhci_pci_slot *slot)
> {
> int ret = byt_emmc_probe_slot(slot);
>
> + slot->host->mmc->caps2 |= MMC_CAP2_CQE;
> +
> if (slot->chip->pdev->device != PCI_DEVICE_ID_INTEL_GLK_EMMC) {
> slot->host->mmc->caps2 |= MMC_CAP2_HS400_ES,
> slot->host->mmc_host_ops.hs400_enhanced_strobe =
> intel_hs400_enhanced_strobe;
> + slot->host->mmc->caps2 |= MMC_CAP2_CQE_DCMD;
> + }
> +
> + return ret;
> +}
> +
> +static void glk_cqe_enable(struct mmc_host *mmc)
> +{
> + struct sdhci_host *host = mmc_priv(mmc);
> + u32 reg;
> +
> + /*
> + * CQE gets stuck if it sees Buffer Read Enable bit set, which can be
> + * the case after tuning, so ensure the buffer is drained.
> + */
> + reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
> + while (reg & SDHCI_DATA_AVAILABLE) {
> + sdhci_readl(host, SDHCI_BUFFER);
> + reg = sdhci_readl(host, SDHCI_PRESENT_STATE);
> + }
> +
> + sdhci_cqe_enable(mmc);
> +}
> +
> +static const struct cqhci_host_ops glk_cqhci_ops = {
> + .enable = glk_cqe_enable,
> + .disable = sdhci_cqe_disable,
> + .dumpregs = sdhci_pci_dumpregs,
> +};
> +
> +static int glk_emmc_add_host(struct sdhci_pci_slot *slot)
> +{
> + struct device *dev = &slot->chip->pdev->dev;
> + struct sdhci_host *host = slot->host;
> + struct cqhci_host *cq_host;
> + bool dma64;
> + int ret;
> +
> + ret = sdhci_setup_host(host);
> + if (ret)
> + return ret;
> +
> + cq_host = devm_kzalloc(dev, sizeof(*cq_host), GFP_KERNEL);
> + if (!cq_host) {
> + ret = -ENOMEM;
> + goto cleanup;
> }
>
> + cq_host->mmio = host->ioaddr + 0x200;
> + cq_host->quirks |= CQHCI_QUIRK_SHORT_TXFR_DESC_SZ;
> + cq_host->ops = &glk_cqhci_ops;
> +
> + dma64 = host->flags & SDHCI_USE_64_BIT_DMA;
> + if (dma64)
> + cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
> +
> + ret = cqhci_init(cq_host, host->mmc, dma64);
> + if (ret)
> + goto cleanup;
> +
> + ret = __sdhci_add_host(host);
> + if (ret)
> + goto cleanup;
> +
> + return 0;
> +
> +cleanup:
> + sdhci_cleanup_host(host);
> return ret;
> }
>
> @@ -699,11 +843,20 @@ static int byt_sd_probe_slot(struct sdhci_pci_slot *slot)
> static const struct sdhci_pci_fixes sdhci_intel_glk_emmc = {
> .allow_runtime_pm = true,
> .probe_slot = glk_emmc_probe_slot,
> + .add_host = glk_emmc_add_host,
> +#ifdef CONFIG_PM_SLEEP
> + .suspend = sdhci_cqhci_suspend,
> + .resume = sdhci_cqhci_resume,
> +#endif
> +#ifdef CONFIG_PM
> + .runtime_suspend = sdhci_cqhci_runtime_suspend,
> + .runtime_resume = sdhci_cqhci_runtime_resume,
> +#endif
> .quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
> .quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
> SDHCI_QUIRK2_CAPS_BIT63_FOR_HS400 |
> SDHCI_QUIRK2_STOP_WITH_TC,
> - .ops = &sdhci_intel_byt_ops,
> + .ops = &sdhci_intel_glk_ops,
> .priv_size = sizeof(struct intel_host),
> };
>
> --
> 1.9.1
>

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