From 2adaec46178be3b499e133923af227abbc23fb57 Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Wed, 13 May 2020 15:24:34 -0700 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 Signed-off-by: Andy Shevchenko --- drivers/platform/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; -- 2.11.0