This is a note to let you know that I've just added the patch titled
mfd: rtsx: Optimize card detect flow
to the 3.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mfd-rtsx-optimize-card-detect-flow.patch
and it can be found in the queue-3.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 504decc0a063e6a09a1e5b203ca68bc21dfffde9 Mon Sep 17 00:00:00 2001
From: Wei WANG <wei_wang@xxxxxxxxxxxxxx>
Date: Tue, 29 Jan 2013 15:21:37 +0800
Subject: mfd: rtsx: Optimize card detect flow
From: Wei WANG <wei_wang@xxxxxxxxxxxxxx>
commit 504decc0a063e6a09a1e5b203ca68bc21dfffde9 upstream.
1. Schedule card detect work at the end of the ISR
2. Callback function ops->cd_deglitch may delay for a period of time.
It is not proper to call this callback when local irq disabled.
3. Card detect flow can't be executed in parallel with other card reader
operations, so it's better to be protected by mutex.
Signed-off-by: Wei WANG <wei_wang@xxxxxxxxxxxxxx>
Signed-off-by: Samuel Ortiz <sameo@xxxxxxxxxxxxxxx>
Cc: Tim Gardner <rtg.canonical@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mfd/rtsx_pcr.c | 31 +++++++++++++++++++------------
1 file changed, 19 insertions(+), 12 deletions(-)
--- a/drivers/mfd/rtsx_pcr.c
+++ b/drivers/mfd/rtsx_pcr.c
@@ -758,7 +758,7 @@ static void rtsx_pci_card_detect(struct
struct delayed_work *dwork;
struct rtsx_pcr *pcr;
unsigned long flags;
- unsigned int card_detect = 0;
+ unsigned int card_detect = 0, card_inserted, card_removed;
u32 irq_status;
dwork = to_delayed_work(work);
@@ -766,25 +766,32 @@ static void rtsx_pci_card_detect(struct
dev_dbg(&(pcr->pci->dev), "--> %s\n", __func__);
+ mutex_lock(&pcr->pcr_mutex);
spin_lock_irqsave(&pcr->lock, flags);
irq_status = rtsx_pci_readl(pcr, RTSX_BIPR);
dev_dbg(&(pcr->pci->dev), "irq_status: 0x%08x\n", irq_status);
- if (pcr->card_inserted || pcr->card_removed) {
+ irq_status &= CARD_EXIST;
+ card_inserted = pcr->card_inserted & irq_status;
+ card_removed = pcr->card_removed;
+ pcr->card_inserted = 0;
+ pcr->card_removed = 0;
+
+ spin_unlock_irqrestore(&pcr->lock, flags);
+
+ if (card_inserted || card_removed) {
dev_dbg(&(pcr->pci->dev),
"card_inserted: 0x%x, card_removed: 0x%x\n",
- pcr->card_inserted, pcr->card_removed);
+ card_inserted, card_removed);
if (pcr->ops->cd_deglitch)
- pcr->card_inserted = pcr->ops->cd_deglitch(pcr);
+ card_inserted = pcr->ops->cd_deglitch(pcr);
- card_detect = pcr->card_inserted | pcr->card_removed;
- pcr->card_inserted = 0;
- pcr->card_removed = 0;
+ card_detect = card_inserted | card_removed;
}
- spin_unlock_irqrestore(&pcr->lock, flags);
+ mutex_unlock(&pcr->pcr_mutex);
if ((card_detect & SD_EXIST) && pcr->slots[RTSX_SD_CARD].card_event)
pcr->slots[RTSX_SD_CARD].card_event(
@@ -836,10 +843,6 @@ static irqreturn_t rtsx_pci_isr(int irq,
}
}
- if (pcr->card_inserted || pcr->card_removed)
- schedule_delayed_work(&pcr->carddet_work,
- msecs_to_jiffies(200));
-
if (int_reg & (NEED_COMPLETE_INT | DELINK_INT)) {
if (int_reg & (TRANS_FAIL_INT | DELINK_INT)) {
pcr->trans_result = TRANS_RESULT_FAIL;
@@ -852,6 +855,10 @@ static irqreturn_t rtsx_pci_isr(int irq,
}
}
+ if (pcr->card_inserted || pcr->card_removed)
+ schedule_delayed_work(&pcr->carddet_work,
+ msecs_to_jiffies(200));
+
spin_unlock(&pcr->lock);
return IRQ_HANDLED;
}
Patches currently in stable-queue which might be from wei_wang@xxxxxxxxxxxxxx are
queue-3.8/mfd-rtsx-optimize-card-detect-flow.patch
queue-3.8/mfd-rtsx-fix-issue-that-booting-os-with-sd-card-inserted.patch
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