Patch "mmc: sdhci-pci: Fix S0i3 for Intel BYT-based controllers" has been added to the 4.14-stable tree
From: <gregkh@linuxfoundation.org>
Date: 2018-03-06 18:49:26
This is a note to let you know that I've just added the patch titled
mmc: sdhci-pci: Fix S0i3 for Intel BYT-based controllers
to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-sdhci-pci-fix-s0i3-for-intel-byt-based-controllers.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let [off-list ref] know about it.
From f8870ae6e2d6be75b1accc2db981169fdfbea7ab Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com> Date: Wed, 14 Feb 2018 15:57:43 +0200 Subject: mmc: sdhci-pci: Fix S0i3 for Intel BYT-based controllers From: Adrian Hunter <adrian.hunter@intel.com> commit f8870ae6e2d6be75b1accc2db981169fdfbea7ab upstream. Tuning can leave the IP in an active state (Buffer Read Enable bit set) which prevents the entry to low power states (i.e. S0i3). Data reset will clear it. Generally tuning is followed by a data transfer which will anyway sort out the state, so it is rare that S0i3 is actually prevented. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Cc: stable@vger.kernel.org Signed-off-by: Ulf Hansson <redacted> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- drivers/mmc/host/sdhci-pci-core.c | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-)
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c@@ -594,9 +594,36 @@ static void byt_read_dsm(struct sdhci_pc slot->chip->rpm_retune = intel_host->d3_retune; } -static int byt_emmc_probe_slot(struct sdhci_pci_slot *slot) +static int intel_execute_tuning(struct mmc_host *mmc, u32 opcode) +{ + int err = sdhci_execute_tuning(mmc, opcode); + struct sdhci_host *host = mmc_priv(mmc); + + if (err) + return err; + + /* + * Tuning can leave the IP in an active state (Buffer Read Enable bit + * set) which prevents the entry to low power states (i.e. S0i3). Data + * reset will clear it. + */ + sdhci_reset(host, SDHCI_RESET_DATA); + + return 0; +} + +static void byt_probe_slot(struct sdhci_pci_slot *slot) { + struct mmc_host_ops *ops = &slot->host->mmc_host_ops; + byt_read_dsm(slot); + + ops->execute_tuning = intel_execute_tuning; +} + +static int byt_emmc_probe_slot(struct sdhci_pci_slot *slot) +{ + byt_probe_slot(slot); slot->host->mmc->caps |= MMC_CAP_8_BIT_DATA | MMC_CAP_NONREMOVABLE | MMC_CAP_HW_RESET | MMC_CAP_1_8V_DDR | MMC_CAP_CMD_DURING_TFR |
@@ -651,7 +678,7 @@ static int ni_byt_sdio_probe_slot(struct { int err; - byt_read_dsm(slot); + byt_probe_slot(slot); err = ni_set_max_freq(slot); if (err)
@@ -664,7 +691,7 @@ static int ni_byt_sdio_probe_slot(struct static int byt_sdio_probe_slot(struct sdhci_pci_slot *slot) { - byt_read_dsm(slot); + byt_probe_slot(slot); slot->host->mmc->caps |= MMC_CAP_POWER_OFF_CARD | MMC_CAP_NONREMOVABLE | MMC_CAP_WAIT_WHILE_BUSY; return 0;
@@ -672,7 +699,7 @@ static int byt_sdio_probe_slot(struct sd static int byt_sd_probe_slot(struct sdhci_pci_slot *slot) { - byt_read_dsm(slot); + byt_probe_slot(slot); slot->host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_AGGRESSIVE_PM | MMC_CAP_CD_WAKE; slot->cd_idx = 0;
Patches currently in stable-queue which might be from adrian.hunter@intel.com are queue-4.14/mmc-sdhci-pci-fix-s0i3-for-intel-byt-based-controllers.patch