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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2018-01-11 16:51:58 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2018-01-11 17:51:09 +0300
commit2a609abe71ca59e4bd7139e161eaca2144ae6f2e (patch)
tree2e245461b39e3d0c42baa004b477ad7be4badcef /drivers/mmc
parentb8155d3ff3ebbdfa10c6ec6c5f04b263670727e6 (diff)
downloadlinux-2a609abe71ca59e4bd7139e161eaca2144ae6f2e.tar.xz
sdhci: Advertise 2.0v supply on SDIO host controller
On Intel Edison the Broadcom Wi-Fi card, which is connected to SDIO, requires 2.0v, while the host, according to Intel Merrifield TRM, supports 1.8v supply only. The card announces itself as mmc2: new ultra high speed DDR50 SDIO card at address 0001 Introduce a custom OCR mask for SDIO host controller on Intel Merrifield and add a special case to sdhci_set_power_noreg() to override 2.0v supply by enforcing 1.8v power choice. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci-pci-core.c2
-rw-r--r--drivers/mmc/host/sdhci.c7
2 files changed, 9 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index c5b229b46314..00fa7a36b336 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -930,6 +930,8 @@ static int intel_mrfld_mmc_probe_slot(struct sdhci_pci_slot *slot)
slot->host->quirks2 |= SDHCI_QUIRK2_NO_1_8_V;
break;
case INTEL_MRFLD_SDIO:
+ /* Advertise 2.0v for compatibility with the SDIO card's OCR */
+ slot->host->ocr_mask = MMC_VDD_20_21 | MMC_VDD_165_195;
slot->host->mmc->caps |= MMC_CAP_NONREMOVABLE |
MMC_CAP_POWER_OFF_CARD;
break;
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index e9290a3439d5..80b1a59bc3c5 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1434,6 +1434,13 @@ void sdhci_set_power_noreg(struct sdhci_host *host, unsigned char mode,
if (mode != MMC_POWER_OFF) {
switch (1 << vdd) {
case MMC_VDD_165_195:
+ /*
+ * Without a regulator, SDHCI does not support 2.0v
+ * so we only get here if the driver deliberately
+ * added the 2.0v range to ocr_avail. Map it to 1.8v
+ * for the purpose of turning on the power.
+ */
+ case MMC_VDD_20_21:
pwr = SDHCI_POWER_180;
break;
case MMC_VDD_29_30: