@@ -330,6 +330,33 @@ static void spt_read_drive_strength(struct sdhci_host *host)
sdhci_pci_spt_drive_strength = 0x10 | ((val >> 12) & 0xf);
}
+static int bxt_get_cd(struct mmc_host *mmc)
+{
+ int gpio_cd = mmc_gpio_get_cd(mmc);
+ struct sdhci_host *host = mmc_priv(mmc);
+ unsigned long flags;
+ int ret = 0;
+
+ if (!gpio_cd)
+ return 0;
+
+ pm_runtime_get_sync(mmc->parent);
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ if (host->flags & SDHCI_DEVICE_DEAD)
+ goto out;
+
+ ret = !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
+out:
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ pm_runtime_mark_last_busy(mmc->parent);
+ pm_runtime_put_autosuspend(mmc->parent);
+
+ return ret;
+}
+
static int byt_emmc_probe_slot(struct sdhci_pci_slot *slot)
{
slot->host->mmc->caps |= MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE |
@@ -362,6 +389,10 @@ static int byt_sd_probe_slot(struct sdhci_pci_slot *slot)
slot->cd_con_id = NULL;
slot->cd_idx = 0;
slot->cd_override_level = true;
+ if (slot->chip->pdev->device == PCI_DEVICE_ID_INTEL_BXT_SD ||
+ slot->chip->pdev->device == PCI_DEVICE_ID_INTEL_APL_SD)
+ slot->host->mmc_host_ops.get_cd = bxt_get_cd;
+
return 0;
}
Intel BXT/APL use a card detect GPIO however the host controller will not enable bus power unless it's card detect also reflects the presence of a card. Unfortunately those 2 things race which can result in commands not starting, after which the controller does nothing and there is a 10 second wait for the driver's 10-second timer to timeout. That is fixed by having the driver look also at the present state register to determine if the card is present. Consequently, provide a 'get_cd' mmc host operation for BXT/APL that does that. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: stable@vger.kernel.org # v4.4+ --- drivers/mmc/host/sdhci-pci-core.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)