[PATCH 2/2] crypto: qat - fix firmware loading failure for GEN6 devices

[Suman Kumar Chakraborty <suman.kumar.chakraborty@intel.com>]

QAT GEN6 hardware requires a minimum 3 us delay during the acceleration
engine reset sequence to ensure the hardware fully settles.
Without this delay, the firmware load may fail intermittently.

Add a delay after placing the AE into reset and before clearing the reset,
matching the hardware requirements and ensuring stable firmware loading.
Earlier generations remain unaffected.

Fixes: 17fd7514ae68 ("crypto: qat - add qat_6xxx driver")
Signed-off-by: Suman Kumar Chakraborty <suman.kumar.chakraborty@intel.com>
Cc: stable@vger.kernel.org
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@intel.com>
---
 drivers/crypto/intel/qat/qat_common/adf_accel_engine.c     | 7 +++++++
 .../crypto/intel/qat/qat_common/icp_qat_fw_loader_handle.h | 1 +
 drivers/crypto/intel/qat/qat_common/qat_hal.c              | 5 ++++-
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/crypto/intel/qat/qat_common/adf_accel_engine.c b/drivers/crypto/intel/qat/qat_common/adf_accel_engine.c
index f9f1018a2823..09d4f547e082 100644
--- a/drivers/crypto/intel/qat/qat_common/adf_accel_engine.c
+++ b/drivers/crypto/intel/qat/qat_common/adf_accel_engine.c
@@ -1,5 +1,6 @@
 // SPDX-License-Identifier: (BSD-3-Clause OR GPL-2.0-only)
 /* Copyright(c) 2014 - 2020 Intel Corporation */
+#include <linux/delay.h>
 #include <linux/firmware.h>
 #include <linux/pci.h>
 #include "adf_cfg.h"
@@ -162,8 +163,14 @@ int adf_ae_stop(struct adf_accel_dev *accel_dev)
 static int adf_ae_reset(struct adf_accel_dev *accel_dev, int ae)
 {
 	struct adf_fw_loader_data *loader_data = accel_dev->fw_loader;
+	unsigned long reset_delay;
 
 	qat_hal_reset(loader_data->fw_loader);
+
+	reset_delay = loader_data->fw_loader->chip_info->reset_delay_us;
+	if (reset_delay)
+		fsleep(reset_delay);
+
 	if (qat_hal_clr_reset(loader_data->fw_loader))
 		return -EFAULT;
 
diff --git a/drivers/crypto/intel/qat/qat_common/icp_qat_fw_loader_handle.h b/drivers/crypto/intel/qat/qat_common/icp_qat_fw_loader_handle.h
index 6887930c7995..e74cafa95f1c 100644
--- a/drivers/crypto/intel/qat/qat_common/icp_qat_fw_loader_handle.h
+++ b/drivers/crypto/intel/qat/qat_common/icp_qat_fw_loader_handle.h
@@ -27,6 +27,7 @@ struct icp_qat_fw_loader_chip_info {
 	int mmp_sram_size;
 	bool nn;
 	bool lm2lm3;
+	u16 reset_delay_us;
 	u32 lm_size;
 	u32 icp_rst_csr;
 	u32 icp_rst_mask;
diff --git a/drivers/crypto/intel/qat/qat_common/qat_hal.c b/drivers/crypto/intel/qat/qat_common/qat_hal.c
index 0f5a2690690a..1c3d1311f1c7 100644
--- a/drivers/crypto/intel/qat/qat_common/qat_hal.c
+++ b/drivers/crypto/intel/qat/qat_common/qat_hal.c
@@ -20,6 +20,7 @@
 #define RST_CSR_QAT_LSB			20
 #define RST_CSR_AE_LSB			0
 #define MC_TIMESTAMP_ENABLE		(0x1 << 7)
+#define MIN_RESET_DELAY_US		3
 
 #define IGNORE_W1C_MASK ((~(1 << CE_BREAKPOINT_BITPOS)) & \
 	(~(1 << CE_CNTL_STORE_PARITY_ERROR_BITPOS)) & \
@@ -713,8 +714,10 @@ static int qat_hal_chip_init(struct icp_qat_fw_loader_handle *handle,
 		handle->chip_info->wakeup_event_val = 0x80000000;
 		handle->chip_info->fw_auth = true;
 		handle->chip_info->css_3k = true;
-		if (handle->pci_dev->device == PCI_DEVICE_ID_INTEL_QAT_6XXX)
+		if (handle->pci_dev->device == PCI_DEVICE_ID_INTEL_QAT_6XXX) {
 			handle->chip_info->dual_sign = true;
+			handle->chip_info->reset_delay_us = MIN_RESET_DELAY_US;
+		}
 		handle->chip_info->tgroup_share_ustore = true;
 		handle->chip_info->fcu_ctl_csr = FCU_CONTROL_4XXX;
 		handle->chip_info->fcu_sts_csr = FCU_STATUS_4XXX;
-- 
2.52.0