linux-kernel - [PATCH] platform/x86: ISST: Increase timeout

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Message-Id: <20200513222434.152088-1-srinivas.pandruvada@linux.intel.com>
Date:   Wed, 13 May 2020 15:24:34 -0700
From:   Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To:     andy@...radead.org, dvhart@...radead.org, prarit@...hat.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: [PATCH] platform/x86: ISST: Increase timeout

Fix timeout issue on some Ice Lake servers, where mail box command is
timing out before the response,

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
---
 .../x86/intel_speed_select_if/isst_if_mbox_pci.c      | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

diff --git a/drivers/platform/x86/intel_speed_select_if/isst_if_mbox_pci.c b/drivers/platform/x86/intel_speed_select_if/isst_if_mbox_pci.c
index de4169d0796b..d84e2174cbde 100644
--- a/drivers/platform/x86/intel_speed_select_if/isst_if_mbox_pci.c
+++ b/drivers/platform/x86/intel_speed_select_if/isst_if_mbox_pci.c
@@ -21,13 +21,12 @@
 #define PUNIT_MAILBOX_BUSY_BIT		31
 
 /*
- * Commands has variable amount of processing time. Most of the commands will
- * be done in 0-3 tries, but some takes up to 50.
- * The real processing time was observed as 25us for the most of the commands
- * at 2GHz. It is possible to optimize this count taking samples on customer
- * systems.
+ * The average time to complete some commands is about 40us. The current
+ * count is enough to satisfy 40us. But when the firmware is very busy, this
+ * causes timeout occasionally.  So increase to deal with some worst case
+ * scenarios. Most of the command still complete in few us.
  */
-#define OS_MAILBOX_RETRY_COUNT		50
+#define OS_MAILBOX_RETRY_COUNT		100
 
 struct isst_if_device {
 	struct mutex mutex;
-- 
2.25.4