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habanalabs: clear msg_to_cpu_reg to avoid misread after reset

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For some ASICs, the f/w reads the msg_to_cpu_reg value after
reset, and for some it doesn't.
Therefore, to be sure f/w doesn't read a wrong value after reset, we
need to clear this register before the reset occurs.

Signed-off-by: Koby Elbaz <kelbaz@habana.ai>
Reviewed-by: Oded Gabbay <ogabbay@kernel.org>
Signed-off-by: Oded Gabbay <ogabbay@kernel.org>
This commit is contained in:
Koby Elbaz 2021-07-19 08:28:34 +03:00 committed by Oded Gabbay
parent b9317d5130
commit cc5b4c4c75
1 changed files with 12 additions and 16 deletions
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28
drivers/misc/habanalabs/common/firmware_if.c
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@ -667,17 +667,15 @@ int hl_fw_cpucp_info_get(struct hl_device *hdev,
hdev->event_queue.check_eqe_index = false;
/* Read FW application security bits again */
if (hdev->asic_prop.fw_cpu_boot_dev_sts0_valid) {
hdev->asic_prop.fw_app_cpu_boot_dev_sts0 =
RREG32(sts_boot_dev_sts0_reg);
if (hdev->asic_prop.fw_app_cpu_boot_dev_sts0 &
if (prop->fw_cpu_boot_dev_sts0_valid) {
prop->fw_app_cpu_boot_dev_sts0 = RREG32(sts_boot_dev_sts0_reg);
if (prop->fw_app_cpu_boot_dev_sts0 &
CPU_BOOT_DEV_STS0_EQ_INDEX_EN)
hdev->event_queue.check_eqe_index = true;
}
if (hdev->asic_prop.fw_cpu_boot_dev_sts1_valid)
hdev->asic_prop.fw_app_cpu_boot_dev_sts1 =
RREG32(sts_boot_dev_sts1_reg);
if (prop->fw_cpu_boot_dev_sts1_valid)
prop->fw_app_cpu_boot_dev_sts1 = RREG32(sts_boot_dev_sts1_reg);
out:
hdev->asic_funcs->cpu_accessible_dma_pool_free(hdev,
@ -1012,6 +1010,11 @@ void hl_fw_ask_halt_machine_without_linux(struct hl_device *hdev)
} else {
WREG32(static_loader->kmd_msg_to_cpu_reg, KMD_MSG_GOTO_WFE);
msleep(static_loader->cpu_reset_wait_msec);
/* Must clear this register in order to prevent preboot
* from reading WFE after reboot
*/
WREG32(static_loader->kmd_msg_to_cpu_reg, KMD_MSG_NA);
}
hdev->device_cpu_is_halted = true;
@ -1242,11 +1245,6 @@ static void hl_fw_preboot_update_state(struct hl_device *hdev)
* b. Check whether hard reset is done by boot cpu
* 3. FW application - a. Fetch fw application security status
* b. Check whether hard reset is done by fw app
*
* Preboot:
* Check security status bit (CPU_BOOT_DEV_STS0_ENABLED). If set, then-
* check security enabled bit (CPU_BOOT_DEV_STS0_SECURITY_EN)
* If set, then mark GIC controller to be disabled.
*/
prop->hard_reset_done_by_fw =
!!(cpu_boot_dev_sts0 & CPU_BOOT_DEV_STS0_FW_HARD_RST_EN);
@ -2126,8 +2124,7 @@ static void hl_fw_linux_update_state(struct hl_device *hdev,
/* Read FW application security bits */
if (prop->fw_cpu_boot_dev_sts0_valid) {
prop->fw_app_cpu_boot_dev_sts0 =
RREG32(cpu_boot_dev_sts0_reg);
prop->fw_app_cpu_boot_dev_sts0 = RREG32(cpu_boot_dev_sts0_reg);
if (prop->fw_app_cpu_boot_dev_sts0 &
CPU_BOOT_DEV_STS0_FW_HARD_RST_EN)
@ -2147,8 +2144,7 @@ static void hl_fw_linux_update_state(struct hl_device *hdev,
}
if (prop->fw_cpu_boot_dev_sts1_valid) {
prop->fw_app_cpu_boot_dev_sts1 =
RREG32(cpu_boot_dev_sts1_reg);
prop->fw_app_cpu_boot_dev_sts1 = RREG32(cpu_boot_dev_sts1_reg);
dev_dbg(hdev->dev,
"Firmware application CPU status1 %#x\n",