From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: [PATCH] mmc: sdhci-pci: Remove D3 delays for Intel BYT-related host controllers Date: Fri, 6 Oct 2017 15:50:59 +0300 Message-ID: <1507294259-20438-1-git-send-email-adrian.hunter@intel.com> Return-path: Received: from mga05.intel.com ([192.55.52.43]:37128 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751869AbdJFM5q (ORCPT ); Fri, 6 Oct 2017 08:57:46 -0400 Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: Ulf Hansson Cc: linux-mmc , linux-pci , Bjorn Helgaas , linux-acpi , "Rafael J. Wysocki" The default D3 cold delay of 100 ms can cause pauses when streaming audio from eMMC. Intel BYT-related host controllers do not need PCI D3 delays. Although the delays can be set to zero via an ACPI _DSM, unfortunately that is not being used in all cases. So just set the delays to zero in the driver. Signed-off-by: Adrian Hunter --- drivers/mmc/host/sdhci-pci-core.c | 17 +++++++++++++---- 1 file changed, 13 insertions(+), 4 deletions(-) diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c index 5f3f7b51299f..14ef99b6e5b7 100644 --- a/drivers/mmc/host/sdhci-pci-core.c +++ b/drivers/mmc/host/sdhci-pci-core.c @@ -592,9 +592,18 @@ static void byt_read_dsm(struct sdhci_pci_slot *slot) slot->chip->rpm_retune = intel_host->d3_retune; } -static int byt_emmc_probe_slot(struct sdhci_pci_slot *slot) +static void byt_common_setup(struct sdhci_pci_slot *slot) { byt_read_dsm(slot); + + /* PCI D3 delays are not needed */ + slot->chip->pdev->d3_delay = 0; + slot->chip->pdev->d3cold_delay = 0; +} + +static int byt_emmc_probe_slot(struct sdhci_pci_slot *slot) +{ + byt_common_setup(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 | @@ -649,7 +658,7 @@ static int ni_byt_sdio_probe_slot(struct sdhci_pci_slot *slot) { int err; - byt_read_dsm(slot); + byt_common_setup(slot); err = ni_set_max_freq(slot); if (err) @@ -662,7 +671,7 @@ static int ni_byt_sdio_probe_slot(struct sdhci_pci_slot *slot) static int byt_sdio_probe_slot(struct sdhci_pci_slot *slot) { - byt_read_dsm(slot); + byt_common_setup(slot); slot->host->mmc->caps |= MMC_CAP_POWER_OFF_CARD | MMC_CAP_NONREMOVABLE | MMC_CAP_WAIT_WHILE_BUSY; return 0; @@ -670,7 +679,7 @@ static int byt_sdio_probe_slot(struct sdhci_pci_slot *slot) static int byt_sd_probe_slot(struct sdhci_pci_slot *slot) { - byt_read_dsm(slot); + byt_common_setup(slot); slot->host->mmc->caps |= MMC_CAP_WAIT_WHILE_BUSY | MMC_CAP_AGGRESSIVE_PM | MMC_CAP_CD_WAKE; slot->cd_idx = 0; -- 1.9.1