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authorRussell King <rmk+kernel@arm.linux.org.uk>2014-04-25 15:55:30 +0400
committerChris Ball <chris@printf.net>2014-05-22 15:26:03 +0400
commitbf3b5ec66bd03d66e9ea729aaca013ea1047a797 (patch)
tree0aa1b43812cdde41d0a2de116951af61ee042fb7 /drivers/mmc/core/sdio_irq.c
parent197160d52e859575ff0ad1afd674ab2a825b9f83 (diff)
downloadlinux-bf3b5ec66bd03d66e9ea729aaca013ea1047a797.tar.xz
mmc: sdio_irq: rework sdio irq handling
Rather than the SDIO support spawning it's own thread for handling card interrupts, use the generic IRQ infrastructure for this, triggering it from the host interface's interrupt handling directly. This avoids a race between the parent thread waiting to receive an interrupt response from the card, and the slow startup from the sdio irq thread, which can occur as a result of high system load (eg, while udev is running.) Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Tested-by: Markus Pargmann <mpa@pengutronix.de> Tested-by: Stephen Warren <swarren@nvidia.com> [Ulf Hansson] Resolved conflict Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Chris Ball <chris@printf.net>
Diffstat (limited to 'drivers/mmc/core/sdio_irq.c')
-rw-r--r--drivers/mmc/core/sdio_irq.c41
1 files changed, 31 insertions, 10 deletions
diff --git a/drivers/mmc/core/sdio_irq.c b/drivers/mmc/core/sdio_irq.c
index aaa90460ed23..5cc13c8d35bb 100644
--- a/drivers/mmc/core/sdio_irq.c
+++ b/drivers/mmc/core/sdio_irq.c
@@ -90,6 +90,15 @@ static int process_sdio_pending_irqs(struct mmc_host *host)
return ret;
}
+void sdio_run_irqs(struct mmc_host *host)
+{
+ mmc_claim_host(host);
+ host->sdio_irq_pending = true;
+ process_sdio_pending_irqs(host);
+ mmc_release_host(host);
+}
+EXPORT_SYMBOL_GPL(sdio_run_irqs);
+
static int sdio_irq_thread(void *_host)
{
struct mmc_host *host = _host;
@@ -189,14 +198,20 @@ static int sdio_card_irq_get(struct mmc_card *card)
WARN_ON(!host->claimed);
if (!host->sdio_irqs++) {
- atomic_set(&host->sdio_irq_thread_abort, 0);
- host->sdio_irq_thread =
- kthread_run(sdio_irq_thread, host, "ksdioirqd/%s",
- mmc_hostname(host));
- if (IS_ERR(host->sdio_irq_thread)) {
- int err = PTR_ERR(host->sdio_irq_thread);
- host->sdio_irqs--;
- return err;
+ if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
+ atomic_set(&host->sdio_irq_thread_abort, 0);
+ host->sdio_irq_thread =
+ kthread_run(sdio_irq_thread, host,
+ "ksdioirqd/%s", mmc_hostname(host));
+ if (IS_ERR(host->sdio_irq_thread)) {
+ int err = PTR_ERR(host->sdio_irq_thread);
+ host->sdio_irqs--;
+ return err;
+ }
+ } else {
+ mmc_host_clk_hold(host);
+ host->ops->enable_sdio_irq(host, 1);
+ mmc_host_clk_release(host);
}
}
@@ -211,8 +226,14 @@ static int sdio_card_irq_put(struct mmc_card *card)
BUG_ON(host->sdio_irqs < 1);
if (!--host->sdio_irqs) {
- atomic_set(&host->sdio_irq_thread_abort, 1);
- kthread_stop(host->sdio_irq_thread);
+ if (!(host->caps2 & MMC_CAP2_SDIO_IRQ_NOTHREAD)) {
+ atomic_set(&host->sdio_irq_thread_abort, 1);
+ kthread_stop(host->sdio_irq_thread);
+ } else {
+ mmc_host_clk_hold(host);
+ host->ops->enable_sdio_irq(host, 0);
+ mmc_host_clk_release(host);
+ }
}
return 0;