From eae0b60d64834c75a460d96b1d1e0e187381e341 Mon Sep 17 00:00:00 2001
From: Bard Liao <yung-chuan.liao@linux.intel.com>
Date: Wed, 11 Dec 2019 19:45:04 -0600
Subject: [PATCH] soundwire: intel: add link_list to handle interrupts with a single thread
Git-commit: eae0b60d64834c75a460d96b1d1e0e187381e341
Patch-mainline: v5.6-rc1
References: jsc#SLE-16518

In MSI mode, the use of separate handlers and threads for the Intel
IPC, stream and SoundWire shared interrupt leads to timeouts and lost
interrupts.

The solution is to merge all interrupt handling across all links with
a single thread function. The use of a linked list enables this thread
function to walk through all contexts and figure out which link needs
attention.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191212014507.28050-9-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 include/linux/soundwire/sdw_intel.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/soundwire/sdw_intel.h b/include/linux/soundwire/sdw_intel.h
index 2ce3e9ecc4b6..2a56180bc9dc 100644
--- a/include/linux/soundwire/sdw_intel.h
+++ b/include/linux/soundwire/sdw_intel.h
@@ -70,6 +70,7 @@ struct sdw_intel_link_res;
  * @handle: ACPI parent handle
  * @links: information for each link (controller-specific and kept
  * opaque here)
+ * @link_list: list to handle interrupts across all links
  */
 struct sdw_intel_ctx {
 	int count;
@@ -77,6 +78,7 @@ struct sdw_intel_ctx {
 	u32 link_mask;
 	acpi_handle handle;
 	struct sdw_intel_link_res *links;
+	struct list_head link_list;
 };
 
 /**
-- 
2.16.4