[PATCH] accel/ivpu: Fix sporadic VPU boot failure

[Stanislaw Gruszka]

From: Andrzej Kacprowski <andrzej.kacprow...@linux.intel.com>

Wait for AON bit in HOST_SS_CPR_RST_CLR to return 0 before
starting VPUIP power up sequence, otherwise the VPU device
may sporadically fail to boot.

An error in power up sequence is propagated to the runtime
power management - the device will be in an error state
until the VPU driver is reloaded.

Fixes: 35b137630f08 ("accel/ivpu: Introduce a new DRM driver for Intel VPU")
Cc: sta...@vger.kernel.org # 6.3.x
Signed-off-by: Andrzej Kacprowski <andrzej.kacprow...@linux.intel.com>
Reviewed-by: Krystian Pradzynski <krystian.pradzyn...@linux.intel.com>
Signed-off-by: Stanislaw Gruszka <stanislaw.grus...@linux.intel.com>
---
 drivers/accel/ivpu/ivpu_hw_mtl.c     | 13 ++++++++++++-
 drivers/accel/ivpu/ivpu_hw_mtl_reg.h |  1 +
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/accel/ivpu/ivpu_hw_mtl.c b/drivers/accel/ivpu/ivpu_hw_mtl.c
index 382ec127be8e..efae679d7b7a 100644
--- a/drivers/accel/ivpu/ivpu_hw_mtl.c
+++ b/drivers/accel/ivpu/ivpu_hw_mtl.c
@@ -197,6 +197,11 @@ static void ivpu_pll_init_frequency_ratios(struct 
ivpu_device *vdev)
        hw->pll.pn_ratio = clamp_t(u8, fuse_pn_ratio, hw->pll.min_ratio, 
hw->pll.max_ratio);
 }
 
+static int ivpu_hw_mtl_wait_for_vpuip_bar(struct ivpu_device *vdev)
+{
+       return REGV_POLL_FLD(MTL_VPU_HOST_SS_CPR_RST_CLR, AON, 0, 100);
+}
+
 static int ivpu_pll_drive(struct ivpu_device *vdev, bool enable)
 {
        struct ivpu_hw_info *hw = vdev->hw;
@@ -239,6 +244,12 @@ static int ivpu_pll_drive(struct ivpu_device *vdev, bool 
enable)
                        ivpu_err(vdev, "Timed out waiting for PLL ready 
status\n");
                        return ret;
                }
+
+               ret = ivpu_hw_mtl_wait_for_vpuip_bar(vdev);
+               if (ret) {
+                       ivpu_err(vdev, "Timed out waiting for VPUIP bar\n");
+                       return ret;
+               }
        }
 
        return 0;
@@ -256,7 +267,7 @@ static int ivpu_pll_disable(struct ivpu_device *vdev)
 
 static void ivpu_boot_host_ss_rst_clr_assert(struct ivpu_device *vdev)
 {
-       u32 val = REGV_RD32(MTL_VPU_HOST_SS_CPR_RST_CLR);
+       u32 val = 0;
 
        val = REG_SET_FLD(MTL_VPU_HOST_SS_CPR_RST_CLR, TOP_NOC, val);
        val = REG_SET_FLD(MTL_VPU_HOST_SS_CPR_RST_CLR, DSS_MAS, val);
diff --git a/drivers/accel/ivpu/ivpu_hw_mtl_reg.h 
b/drivers/accel/ivpu/ivpu_hw_mtl_reg.h
index d83ccfd9a871..593b8ff07417 100644
--- a/drivers/accel/ivpu/ivpu_hw_mtl_reg.h
+++ b/drivers/accel/ivpu/ivpu_hw_mtl_reg.h
@@ -91,6 +91,7 @@
 #define MTL_VPU_HOST_SS_CPR_RST_SET_MSS_MAS_MASK                       
BIT_MASK(11)
 
 #define MTL_VPU_HOST_SS_CPR_RST_CLR                                    
0x00000098u
+#define MTL_VPU_HOST_SS_CPR_RST_CLR_AON_MASK                           
BIT_MASK(0)
 #define MTL_VPU_HOST_SS_CPR_RST_CLR_TOP_NOC_MASK                       
BIT_MASK(1)
 #define MTL_VPU_HOST_SS_CPR_RST_CLR_DSS_MAS_MASK                       
BIT_MASK(10)
 #define MTL_VPU_HOST_SS_CPR_RST_CLR_MSS_MAS_MASK                       
BIT_MASK(11)
-- 
2.25.1