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' sdhci host operation for BXT/APL that does that.
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # v4.4+
---
drivers/mmc/host/sdhci-pci-core.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index cc851b065d0a..c92652142860 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -330,6 +330,18 @@ 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 sdhci_host *host)
+{
+ int gpio_cd = mmc_gpio_get_cd(host->mmc);
+
+ if (!gpio_cd)
+ return 0;
+
+ return !!(sdhci_readl(host, SDHCI_PRESENT_STATE) & SDHCI_CARD_PRESENT);
+}
+
+static const struct sdhci_ops bxt_ops;
+
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 +374,10 @@ 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->ops = &bxt_ops;
+
return 0;
}
@@ -1362,6 +1378,17 @@ static int sdhci_pci_select_drive_strength(struct sdhci_host *host,
card_drv, drv_type);
}
+static const struct sdhci_ops bxt_ops = {
+ .set_clock = sdhci_set_clock,
+ .enable_dma = sdhci_pci_enable_dma,
+ .set_bus_width = sdhci_pci_set_bus_width,
+ .reset = sdhci_reset,
+ .set_uhs_signaling = sdhci_set_uhs_signaling,
+ .hw_reset = sdhci_pci_hw_reset,
+ .select_drive_strength = sdhci_pci_select_drive_strength,
+ .get_cd = bxt_get_cd,
+};
+
static const struct sdhci_ops sdhci_pci_ops = {
.set_clock = sdhci_set_clock,
.enable_dma = sdhci_pci_enable_dma,
--
1.9.1
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