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platform/x86: ISST: Increase timeout

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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@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
This commit is contained in:
Srinivas Pandruvada 2020-05-13 15:24:34 -07:00 committed by Andy Shevchenko
parent f441d66a6e
commit 2adaec4617
1 changed files with 5 additions and 6 deletions
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11
drivers/platform/x86/intel_speed_select_if/isst_if_mbox_pci.c
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@ -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;