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| author | Adrian Hunter <adrian.hunter@intel.com> | 2021-03-31 11:17:52 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-05-11 14:47:14 +0200 |
| commit | 6c43290972ed6951ab471f8a42226b055ecda481 (patch) | |
| tree | 460062e7f701c698ac56ee5e791dd96584d035cc /drivers/mmc | |
| parent | 01db7cb746f09c12b832bdc49a670a142eba23d4 (diff) | |
| download | linux-stable-6c43290972ed6951ab471f8a42226b055ecda481.tar.gz linux-stable-6c43290972ed6951ab471f8a42226b055ecda481.tar.bz2 linux-stable-6c43290972ed6951ab471f8a42226b055ecda481.zip | |
mmc: sdhci-pci: Fix initialization of some SD cards for Intel BYT-based controllers
commit 2970134b927834e9249659a70aac48e62dff804a upstream.
Bus power may control card power, but the full reset done by SDHCI at
initialization still may not reset the power, whereas a direct write to
SDHCI_POWER_CONTROL can. That might be needed to initialize correctly, if
the card was left powered on previously.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20210331081752.23621-1-adrian.hunter@intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci-pci-core.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c index 9552708846ca..936e4db9060f 100644 --- a/drivers/mmc/host/sdhci-pci-core.c +++ b/drivers/mmc/host/sdhci-pci-core.c @@ -516,6 +516,7 @@ struct intel_host { int drv_strength; bool d3_retune; bool rpm_retune_ok; + bool needs_pwr_off; u32 glk_rx_ctrl1; u32 glk_tun_val; u32 active_ltr; @@ -643,9 +644,25 @@ out: static void sdhci_intel_set_power(struct sdhci_host *host, unsigned char mode, unsigned short vdd) { + struct sdhci_pci_slot *slot = sdhci_priv(host); + struct intel_host *intel_host = sdhci_pci_priv(slot); int cntr; u8 reg; + /* + * Bus power may control card power, but a full reset still may not + * reset the power, whereas a direct write to SDHCI_POWER_CONTROL can. + * That might be needed to initialize correctly, if the card was left + * powered on previously. + */ + if (intel_host->needs_pwr_off) { + intel_host->needs_pwr_off = false; + if (mode != MMC_POWER_OFF) { + sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); + usleep_range(10000, 12500); + } + } + sdhci_set_power(host, mode, vdd); if (mode == MMC_POWER_OFF) @@ -1135,6 +1152,14 @@ static int byt_sdio_probe_slot(struct sdhci_pci_slot *slot) return 0; } +static void byt_needs_pwr_off(struct sdhci_pci_slot *slot) +{ + struct intel_host *intel_host = sdhci_pci_priv(slot); + u8 reg = sdhci_readb(slot->host, SDHCI_POWER_CONTROL); + + intel_host->needs_pwr_off = reg & SDHCI_POWER_ON; +} + static int byt_sd_probe_slot(struct sdhci_pci_slot *slot) { byt_probe_slot(slot); @@ -1152,6 +1177,8 @@ static int byt_sd_probe_slot(struct sdhci_pci_slot *slot) slot->chip->pdev->subsystem_device == PCI_SUBDEVICE_ID_NI_78E3) slot->host->mmc->caps2 |= MMC_CAP2_AVOID_3_3V; + byt_needs_pwr_off(slot); + return 0; } |