nagai/kernel
3
0
Fork 0
forked from mirrors/linux
Code Pull requests Activity

mmc: pxamci: fix card detect with slot-gpio API

Browse source 
Move pxamci to mmc slot-gpio API to fix interrupt request.

It fixes the case where the card detection is on a gpio expander, on I2C
for example on zylonite board. In this case, the card detect netsted
interrupt is called from a threaded interrupt. The request_irq() fails,
because a hard irq cannot be a nested interrupt from a threaded
interrupt (set __setup_irq()).

This was tested on zylonite and mioa701 boards.

Signed-off-by: Robert Jarzmik <robert.jarzmik@free.fr>
Cc: Petr Cvek <petr.cvek@tul.cz>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Robert Jarzmik 2015-09-26 21:41:01 +02:00 committed by Ulf Hansson
parent 51424b2860
commit fd546ee6a7
1 changed files with 22 additions and 44 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

58
drivers/mmc/host/pxamci.c
View file

@ -28,6 +28,7 @@
#include <linux/clk.h>
#include <linux/err.h>
#include <linux/mmc/host.h>
#include <linux/mmc/slot-gpio.h>
#include <linux/io.h>
#include <linux/regulator/consumer.h>
#include <linux/gpio.h>
@ -454,12 +455,8 @@ static int pxamci_get_ro(struct mmc_host *mmc)
{
struct pxamci_host *host = mmc_priv(mmc);
if (host->pdata && gpio_is_valid(host->pdata->gpio_card_ro)) {
if (host->pdata->gpio_card_ro_invert)
return !gpio_get_value(host->pdata->gpio_card_ro);
else
return gpio_get_value(host->pdata->gpio_card_ro);
}
if (host->pdata && gpio_is_valid(host->pdata->gpio_card_ro))
return mmc_gpio_get_ro(mmc);
if (host->pdata && host->pdata->get_ro)
return !!host->pdata->get_ro(mmc_dev(mmc));
/*
@ -551,6 +548,7 @@ static void pxamci_enable_sdio_irq(struct mmc_host *host, int enable)
static const struct mmc_host_ops pxamci_ops = {
.request = pxamci_request,
.get_cd = mmc_gpio_get_cd,
.get_ro = pxamci_get_ro,
.set_ios = pxamci_set_ios,
.enable_sdio_irq = pxamci_enable_sdio_irq,
@ -790,37 +788,31 @@ static int pxamci_probe(struct platform_device *pdev)
gpio_power = host->pdata->gpio_power;
}
if (gpio_is_valid(gpio_power)) {
ret = gpio_request(gpio_power, "mmc card power");
ret = devm_gpio_request(&pdev->dev, gpio_power,
"mmc card power");
if (ret) {
dev_err(&pdev->dev, "Failed requesting gpio_power %d\n", gpio_power);
dev_err(&pdev->dev, "Failed requesting gpio_power %d\n",
gpio_power);
goto out;
}
gpio_direction_output(gpio_power,
host->pdata->gpio_power_invert);
}
if (gpio_is_valid(gpio_ro)) {
ret = gpio_request(gpio_ro, "mmc card read only");
if (gpio_is_valid(gpio_ro))
ret = mmc_gpio_request_ro(mmc, gpio_ro);
if (ret) {
dev_err(&pdev->dev, "Failed requesting gpio_ro %d\n", gpio_ro);
goto err_gpio_ro;
goto out;
} else {
mmc->caps |= host->pdata->gpio_card_ro_invert ?
MMC_CAP2_RO_ACTIVE_HIGH : 0;
}
gpio_direction_input(gpio_ro);
}
if (gpio_is_valid(gpio_cd)) {
ret = gpio_request(gpio_cd, "mmc card detect");
if (gpio_is_valid(gpio_cd))
ret = mmc_gpio_request_cd(mmc, gpio_cd, 0);
if (ret) {
dev_err(&pdev->dev, "Failed requesting gpio_cd %d\n", gpio_cd);
goto err_gpio_cd;
}
gpio_direction_input(gpio_cd);
ret = request_irq(gpio_to_irq(gpio_cd), pxamci_detect_irq,
IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING,
"mmc card detect", mmc);
if (ret) {
dev_err(&pdev->dev, "failed to request card detect IRQ\n");
goto err_request_irq;
}
goto out;
}
if (host->pdata && host->pdata->init)
@ -835,12 +827,6 @@ static int pxamci_probe(struct platform_device *pdev)
return 0;
err_request_irq:
gpio_free(gpio_cd);
err_gpio_cd:
gpio_free(gpio_ro);
err_gpio_ro:
gpio_free(gpio_power);
out:
if (host) {
if (host->dma_chan_rx)
@ -873,14 +859,6 @@ static int pxamci_remove(struct platform_device *pdev)
gpio_ro = host->pdata->gpio_card_ro;
gpio_power = host->pdata->gpio_power;
}
if (gpio_is_valid(gpio_cd)) {
free_irq(gpio_to_irq(gpio_cd), mmc);
gpio_free(gpio_cd);
}
if (gpio_is_valid(gpio_ro))
gpio_free(gpio_ro);
if (gpio_is_valid(gpio_power))
gpio_free(gpio_power);
if (host->vcc)
regulator_put(host->vcc);