fpga: altera-cvp: Increase credit timeout

[ Upstream commit 0f05886a40fdc55016ba4d9ae0a9c41f8312f15b ]

Increase the timeout for SDM (Secure device manager) data credits from
20ms to 40ms. Internal stress tests running at 500 loops failed with the
current timeout of 20ms. At the start of a FPGA configuration, the CVP
host driver reads the transmit credits from SDM. It then sends bitstream
FPGA data to SDM based on the total credits. Each credit allows the
CVP host driver to send 4kBytes of data. There are situations whereby,
the SDM did not respond in time during testing.

Signed-off-by: Ang Tien Sung <tien.sung.ang@intel.com>
Signed-off-by: Kuhanh Murugasen Krishnan <kuhanh.murugasen.krishnan@intel.com>
Acked-by: Xu Yilun <yilun.xu@intel.com>
Link: https://lore.kernel.org/r/20250212221249.2715929-1-tien.sung.ang@intel.com
Signed-off-by: Xu Yilun <yilun.xu@linux.intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/fpga/altera-cvp.c b/drivers/fpga/altera-cvp.c
index 4e0edb60bfba6ae8c8f8f8fa7f6656feca098bb6..d107ad73a188c117e6c133db7a568afce4c5d720 100644 (file)
--- a/drivers/fpga/altera-cvp.c
+++ b/drivers/fpga/altera-cvp.c
@@ -52,7 +52,7 @@
 /* V2 Defines */
 #define VSE_CVP_TX_CREDITS             0x49    /* 8bit */
 
-#define V2_CREDIT_TIMEOUT_US           20000
+#define V2_CREDIT_TIMEOUT_US           40000
 #define V2_CHECK_CREDIT_US             10
 #define V2_POLL_TIMEOUT_US             1000000
 #define V2_USER_TIMEOUT_US             500000