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[7/8] ASoC: SOF: Intel: BYT: mask BUSY or DONE interrupts in handler

Message ID 20200526203640.25980-8-pierre-louis.bossart@linux.intel.com (mailing list archive)
State Accepted
Commit 3d3d1fb9ce34bc045b9d140a5f2ec531eff6a0fe
Headers show
Series ASoC: SOF: finalize Baytrail/CherryTrail support | expand

Commit Message

Pierre-Louis Bossart May 26, 2020, 8:36 p.m. UTC 
The DSP may send the same interrupt multiple times before it's handled
in the interrupt thread. Rather than masking it in the thread, mask it
in the handler directly.

This patch also removes useless checks that cannot happen, and masks
that are set don't need to be re-tested.

BugLink: https://github.com/thesofproject/linux/issues/1492
Suggested-by: Keyon Jie <yang.jie@linux.intel.com>
Tested-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
---
 sound/soc/sof/intel/byt.c | 46 +++++++++++++++++++++------------------
 1 file changed, 25 insertions(+), 21 deletions(-)
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Patch

diff --git a/sound/soc/sof/intel/byt.c b/sound/soc/sof/intel/byt.c
index 8784c7319098..c6ac914ee56c 100644
--- a/sound/soc/sof/intel/byt.c
+++ b/sound/soc/sof/intel/byt.c
@@ -160,13 +160,31 @@  static void byt_dump(struct snd_sof_dev *sdev, u32 flags)
 static irqreturn_t byt_irq_handler(int irq, void *context)
 {
 	struct snd_sof_dev *sdev = context;
-	u64 isr;
+	u64 ipcx, ipcd;
 	int ret = IRQ_NONE;
 
-	/* Interrupt arrived, check src */
-	isr = snd_sof_dsp_read64(sdev, BYT_DSP_BAR, SHIM_ISRX);
-	if (isr & (SHIM_ISRX_DONE | SHIM_ISRX_BUSY))
+	ipcx = snd_sof_dsp_read64(sdev, BYT_DSP_BAR, SHIM_IPCX);
+	ipcd = snd_sof_dsp_read64(sdev, BYT_DSP_BAR, SHIM_IPCD);
+
+	if (ipcx & SHIM_BYT_IPCX_DONE) {
+
+		/* reply message from DSP, Mask Done interrupt first */
+		snd_sof_dsp_update_bits64_unlocked(sdev, BYT_DSP_BAR,
+						   SHIM_IMRX,
+						   SHIM_IMRX_DONE,
+						   SHIM_IMRX_DONE);
 		ret = IRQ_WAKE_THREAD;
+	}
+
+	if (ipcd & SHIM_BYT_IPCD_BUSY) {
+
+		/* new message from DSP, Mask Busy interrupt first */
+		snd_sof_dsp_update_bits64_unlocked(sdev, BYT_DSP_BAR,
+						   SHIM_IMRX,
+						   SHIM_IMRX_BUSY,
+						   SHIM_IMRX_BUSY);
+		ret = IRQ_WAKE_THREAD;
+	}
 
 	return ret;
 }
@@ -175,19 +193,12 @@  static irqreturn_t byt_irq_thread(int irq, void *context)
 {
 	struct snd_sof_dev *sdev = context;
 	u64 ipcx, ipcd;
-	u64 imrx;
 
-	imrx = snd_sof_dsp_read64(sdev, BYT_DSP_BAR, SHIM_IMRX);
 	ipcx = snd_sof_dsp_read64(sdev, BYT_DSP_BAR, SHIM_IPCX);
+	ipcd = snd_sof_dsp_read64(sdev, BYT_DSP_BAR, SHIM_IPCD);
 
 	/* reply message from DSP */
-	if (ipcx & SHIM_BYT_IPCX_DONE &&
-	    !(imrx & SHIM_IMRX_DONE)) {
-		/* Mask Done interrupt before first */
-		snd_sof_dsp_update_bits64_unlocked(sdev, BYT_DSP_BAR,
-						   SHIM_IMRX,
-						   SHIM_IMRX_DONE,
-						   SHIM_IMRX_DONE);
+	if (ipcx & SHIM_BYT_IPCX_DONE) {
 
 		spin_lock_irq(&sdev->ipc_lock);
 
@@ -207,14 +218,7 @@  static irqreturn_t byt_irq_thread(int irq, void *context)
 	}
 
 	/* new message from DSP */
-	ipcd = snd_sof_dsp_read64(sdev, BYT_DSP_BAR, SHIM_IPCD);
-	if (ipcd & SHIM_BYT_IPCD_BUSY &&
-	    !(imrx & SHIM_IMRX_BUSY)) {
-		/* Mask Busy interrupt before return */
-		snd_sof_dsp_update_bits64_unlocked(sdev, BYT_DSP_BAR,
-						   SHIM_IMRX,
-						   SHIM_IMRX_BUSY,
-						   SHIM_IMRX_BUSY);
+	if (ipcd & SHIM_BYT_IPCD_BUSY) {
 
 		/* Handle messages from DSP Core */
 		if ((ipcd & SOF_IPC_PANIC_MAGIC_MASK) == SOF_IPC_PANIC_MAGIC) {