From: Dong Aisheng <b29396@xxxxxxxxxxxxx>
SDIO cards may need clock to send the card interrupt to the host.
Set SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON to prevent the clock resource
being released.
Hans de Goede:
It looks like we still need this patch, on a cherrytrail tablet with
a RTL8723BS wifi chip, without this patch pinging the tablet results in:
PING 192.168.1.14 (192.168.1.14) 56(84) bytes of data.
64 bytes from 192.168.1.14: icmp_seq=1 ttl=64 time=78.6 ms
64 bytes from 192.168.1.14: icmp_seq=2 ttl=64 time=1760 ms
64 bytes from 192.168.1.14: icmp_seq=3 ttl=64 time=753 ms
64 bytes from 192.168.1.14: icmp_seq=4 ttl=64 time=3.88 ms
64 bytes from 192.168.1.14: icmp_seq=5 ttl=64 time=795 ms
64 bytes from 192.168.1.14: icmp_seq=6 ttl=64 time=1841 ms
64 bytes from 192.168.1.14: icmp_seq=7 ttl=64 time=810 ms
64 bytes from 192.168.1.14: icmp_seq=8 ttl=64 time=1860 ms
64 bytes from 192.168.1.14: icmp_seq=9 ttl=64 time=812 ms
64 bytes from 192.168.1.14: icmp_seq=10 ttl=64 time=48.6 ms
Where as with this patch I get:
PING 192.168.1.14 (192.168.1.14) 56(84) bytes of data.
64 bytes from 192.168.1.14: icmp_seq=1 ttl=64 time=3.96 ms
64 bytes from 192.168.1.14: icmp_seq=2 ttl=64 time=1.97 ms
64 bytes from 192.168.1.14: icmp_seq=3 ttl=64 time=17.2 ms
64 bytes from 192.168.1.14: icmp_seq=4 ttl=64 time=2.46 ms
64 bytes from 192.168.1.14: icmp_seq=5 ttl=64 time=2.83 ms
64 bytes from 192.168.1.14: icmp_seq=6 ttl=64 time=1.40 ms
64 bytes from 192.168.1.14: icmp_seq=7 ttl=64 time=2.10 ms
64 bytes from 192.168.1.14: icmp_seq=8 ttl=64 time=1.40 ms
64 bytes from 192.168.1.14: icmp_seq=9 ttl=64 time=2.04 ms
64 bytes from 192.168.1.14: icmp_seq=10 ttl=64 time=1.40 ms
Signed-off-by: Dong Aisheng <b29396@xxxxxxxxxxxxx>
[hdegoede@xxxxxxxxxx: Updated commit msg with sdio wifi ping output]
[hdegoede@xxxxxxxxxx: Add quirk to both acpi and pci intel-sdio entries]
Signed-off-by: Hans de Goede <hdegoede@xxxxxxxxxx>
---
Note an alternative approach would be to add a new flag for this and do
a runtime_pm_get on sdio_irq_enable and runtime_pm_put on
sdio_irq_disable, that would safe some power if the sdio-driver properly
disables the irq when e.g. wifi is turned off, or an oob interrupt is
used.
---
drivers/mmc/host/sdhci-acpi.c | 1 +
drivers/mmc/host/sdhci-pci-core.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index 237f318..c107757 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -288,6 +288,7 @@ static const struct sdhci_acpi_slot sdhci_acpi_slot_int_emmc = {
static const struct sdhci_acpi_slot sdhci_acpi_slot_int_sdio = {
.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
.quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON |
+ SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON |
SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
.caps = MMC_CAP_NONREMOVABLE | MMC_CAP_POWER_OFF_CARD |
MMC_CAP_WAIT_WHILE_BUSY,
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c
index 982b3e3..7cb54b0 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -498,6 +498,7 @@ static const struct sdhci_pci_fixes sdhci_ni_byt_sdio = {
static const struct sdhci_pci_fixes sdhci_intel_byt_sdio = {
.quirks = SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC,
.quirks2 = SDHCI_QUIRK2_HOST_OFF_CARD_ON |
+ SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON |
SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
.allow_runtime_pm = true,
.probe_slot = byt_sdio_probe_slot,
--
2.9.3
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