diff options
| author | Magnus Damm <damm+renesas@opensource.se> | 2016-02-16 13:06:41 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-04-12 07:33:43 -0700 |
| commit | 384640f9028958da8d5a0d0e9df6fe7c13632ab2 (patch) | |
| tree | ad771cff55cb779739f3ac0f1c0a8b8944932366 | |
| parent | 3c5f48963fd4695517693a325863418ca2748e61 (diff) | |
| download | lwn-384640f9028958da8d5a0d0e9df6fe7c13632ab2.tar.gz lwn-384640f9028958da8d5a0d0e9df6fe7c13632ab2.zip | |
mmc: mmc_spi: Add Card Detect comments and fix CD GPIO case
commit bcdc9f260bdce09913db1464be9817170d51044a upstream.
This patch fixes the MMC SPI driver from doing polling card detect when a
CD GPIO that supports interrupts is specified using the gpios DT property.
Without this patch the DT node below results in the following output:
spi_gpio: spi-gpio { /* SD2 @ CN12 */
compatible = "spi-gpio";
#address-cells = <1>;
#size-cells = <0>;
gpio-sck = <&gpio6 16 GPIO_ACTIVE_HIGH>;
gpio-mosi = <&gpio6 17 GPIO_ACTIVE_HIGH>;
gpio-miso = <&gpio6 18 GPIO_ACTIVE_HIGH>;
num-chipselects = <1>;
cs-gpios = <&gpio6 21 GPIO_ACTIVE_LOW>;
status = "okay";
spi@0 {
compatible = "mmc-spi-slot";
reg = <0>;
voltage-ranges = <3200 3400>;
spi-max-frequency = <25000000>;
gpios = <&gpio6 22 GPIO_ACTIVE_LOW>; /* CD */
};
};
# dmesg | grep mmc
mmc_spi spi32766.0: SD/MMC host mmc0, no WP, no poweroff, cd polling
mmc0: host does not support reading read-only switch, assuming write-enable
mmc0: new SDHC card on SPI
mmcblk0: mmc0:0000 SU04G 3.69 GiB
mmcblk0: p1
With this patch applied the "cd polling" portion above disappears.
Signed-off-by: Magnus Damm <damm+renesas@opensource.se>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/mmc/host/mmc_spi.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/mmc/host/mmc_spi.c b/drivers/mmc/host/mmc_spi.c index 3446097a43c0..e77d79c8cd9f 100644 --- a/drivers/mmc/host/mmc_spi.c +++ b/drivers/mmc/host/mmc_spi.c @@ -1442,6 +1442,12 @@ static int mmc_spi_probe(struct spi_device *spi) host->pdata->cd_debounce); if (status != 0) goto fail_add_host; + + /* The platform has a CD GPIO signal that may support + * interrupts, so let mmc_gpiod_request_cd_irq() decide + * if polling is needed or not. + */ + mmc->caps &= ~MMC_CAP_NEEDS_POLL; mmc_gpiod_request_cd_irq(mmc); } |