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ALSA: hda - Loop interrupt handling until really cleared 

Currently the interrupt handler of HD-audio driver assumes that no irq
update is needed while processing the irq.  But in reality, it has
been confirmed that the HW irq is issued even during the irq
handling.  Since we clear the irq status at the beginning, process the
interrupt, then exits from the handler, the lately issued interrupt is
left untouched without being properly processed.

This patch changes the interrupt handler code to loop over the
check-and-process.  The handler tries repeatedly as long as the IRQ
status are turned on, and either stream or CORB/RIRB is handled.

For checking the stream handling, snd_hdac_bus_handle_stream_irq()
returns a value indicating the stream indices bits.  Other than that,
the change is only in the irq handler itself.

Reported-by: Libin Yang <libin.yang@linux.intel.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2016-02-23 15:54:47 +01:00
parent f883982dc1
commit 473f414564
3 changed files with 32 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/sound/hdaudio.h
View File

@ -343,7 +343,7 @@ void snd_hdac_bus_enter_link_reset(struct hdac_bus *bus);
void snd_hdac_bus_exit_link_reset(struct hdac_bus *bus);
void snd_hdac_bus_update_rirb(struct hdac_bus *bus);
void snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
void (*ack)(struct hdac_bus *,
struct hdac_stream *));

7
sound/hda/hdac_controller.c
View File

@ -426,18 +426,22 @@ EXPORT_SYMBOL_GPL(snd_hdac_bus_stop_chip);
* @bus: HD-audio core bus
* @status: INTSTS register value
* @ask: callback to be called for woken streams
*
* Returns the bits of handled streams, or zero if no stream is handled.
*/
void snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
int snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
void (*ack)(struct hdac_bus *,
struct hdac_stream *))
{
struct hdac_stream *azx_dev;
u8 sd_status;
int handled = 0;
list_for_each_entry(azx_dev, &bus->stream_list, list) {
if (status & azx_dev->sd_int_sta_mask) {
sd_status = snd_hdac_stream_readb(azx_dev, SD_STS);
snd_hdac_stream_writeb(azx_dev, SD_STS, SD_INT_MASK);
handled |= 1 << azx_dev->index;
if (!azx_dev->substream || !azx_dev->running ||
!(sd_status & SD_INT_COMPLETE))
continue;
@ -445,6 +449,7 @@ void snd_hdac_bus_handle_stream_irq(struct hdac_bus *bus, unsigned int status,
ack(bus, azx_dev);
}
}
return handled;
}
EXPORT_SYMBOL_GPL(snd_hdac_bus_handle_stream_irq);

45
sound/pci/hda/hda_controller.c
View File

@ -930,6 +930,8 @@ irqreturn_t azx_interrupt(int irq, void *dev_id)
struct azx *chip = dev_id;
struct hdac_bus *bus = azx_bus(chip);
u32 status;
bool active, handled = false;
int repeat = 0; /* count for avoiding endless loop */
#ifdef CONFIG_PM
if (azx_has_pm_runtime(chip))
@ -939,33 +941,36 @@ irqreturn_t azx_interrupt(int irq, void *dev_id)
spin_lock(&bus->reg_lock);
if (chip->disabled) {
spin_unlock(&bus->reg_lock);
return IRQ_NONE;
}
if (chip->disabled)
goto unlock;
status = azx_readl(chip, INTSTS);
if (status == 0 || status == 0xffffffff) {
spin_unlock(&bus->reg_lock);
return IRQ_NONE;
}
do {
status = azx_readl(chip, INTSTS);
if (status == 0 || status == 0xffffffff)
break;
snd_hdac_bus_handle_stream_irq(bus, status, stream_update);
handled = true;
active = false;
if (snd_hdac_bus_handle_stream_irq(bus, status, stream_update))
active = true;
/* clear rirb int */
status = azx_readb(chip, RIRBSTS);
if (status & RIRB_INT_MASK) {
if (status & RIRB_INT_RESPONSE) {
if (chip->driver_caps & AZX_DCAPS_CTX_WORKAROUND)
udelay(80);
snd_hdac_bus_update_rirb(bus);
/* clear rirb int */
status = azx_readb(chip, RIRBSTS);
if (status & RIRB_INT_MASK) {
active = true;
if (status & RIRB_INT_RESPONSE) {
if (chip->driver_caps & AZX_DCAPS_CTX_WORKAROUND)
udelay(80);
snd_hdac_bus_update_rirb(bus);
}
azx_writeb(chip, RIRBSTS, RIRB_INT_MASK);
}
azx_writeb(chip, RIRBSTS, RIRB_INT_MASK);
}
} while (active && ++repeat < 10);
unlock:
spin_unlock(&bus->reg_lock);
return IRQ_HANDLED;
return IRQ_RETVAL(handled);
}
EXPORT_SYMBOL_GPL(azx_interrupt);