[PATCH v2 4/9] media: iris: migrate firmware loading to qcom_mdt_pas_load() and qcom_pas_prepare_and_auth_reset()

[Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>]

iris_load_fw_to_memory() calls qcom_mdt_load(), which bundles
metadata initialization, memory setup, and segment loading into a
single API that does not expose a PAS context.  iris_fw_load()
calls qcom_pas_auth_and_reset() for TrustZone authentication,
which is the intended behaviour. However, a new
qcom_mdt_pas_load() has recently been introduced that works with
a PAS context and can handle everything qcom_mdt_load() provides,
along with additional functionality such as shmbridge creation
and retrieving memory from the shmbridge buffer when the same
remote processor needs to run while Linux runs at EL2.

Embed a struct qcom_pas_context directly in struct iris_core and
initialize it with qcom_pas_context_init() inside
iris_load_fw_to_memory() on each call.  Replace qcom_mdt_load()
with qcom_mdt_pas_load() and replace qcom_pas_auth_and_reset()
with qcom_pas_prepare_and_auth_reset().  The
iris_detect_firmware() scan retains a separate memremap window
after qcom_mdt_pas_load() completes, since it needs to read back
the loaded image data.

Signed-off-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
---
 drivers/media/platform/qcom/iris/iris_core.h  |  2 ++
 .../media/platform/qcom/iris/iris_firmware.c  | 27 +++++++++----------
 2 files changed, 15 insertions(+), 14 deletions(-)

diff --git a/drivers/media/platform/qcom/iris/iris_core.h b/drivers/media/platform/qcom/iris/iris_core.h
index 3e4cf652bf39..ac73bda072f8 100644
--- a/drivers/media/platform/qcom/iris/iris_core.h
+++ b/drivers/media/platform/qcom/iris/iris_core.h
@@ -9,6 +9,7 @@
 #include <linux/types.h>
 #include <linux/dma-mapping.h>
 #include <linux/pm_domain.h>
+#include <linux/firmware/qcom/qcom_pas.h>
 #include <media/v4l2-device.h>
 
 #include "iris_hfi_common.h"
@@ -129,6 +130,7 @@ struct iris_core {
 	struct platform_inst_fw_cap		inst_fw_caps_dec[INST_FW_CAP_MAX];
 	struct platform_inst_fw_cap		inst_fw_caps_enc[INST_FW_CAP_MAX];
 	struct dma_iova_state			*iova_state;
+	struct qcom_pas_context			pas_ctx;
 };
 
 int iris_core_init(struct iris_core *core);
diff --git a/drivers/media/platform/qcom/iris/iris_firmware.c b/drivers/media/platform/qcom/iris/iris_firmware.c
index 21f57d37da18..b701a7f43514 100644
--- a/drivers/media/platform/qcom/iris/iris_firmware.c
+++ b/drivers/media/platform/qcom/iris/iris_firmware.c
@@ -201,21 +201,20 @@ static int iris_load_fw_to_memory(struct iris_core *core)
 		goto err_release_fw;
 	}
 
-	mem_virt = memremap(mem_phys, res_size, MEMREMAP_WC);
-	if (!mem_virt) {
-		ret = -ENOMEM;
-		goto err_release_fw;
-	}
-
-	memset(mem_virt, 0, res_size);
-
-	ret = qcom_mdt_load(dev, firmware, fw_name,
-			    IRIS_PAS_ID, mem_virt, mem_phys, res_size, NULL);
+	qcom_pas_context_init(&core->pas_ctx, dev, IRIS_PAS_ID, mem_phys,
+			      res_size);
+
+	ret = qcom_mdt_pas_load(&core->pas_ctx, firmware, fw_name, NULL);
+	if (!ret) {
+		mem_virt = memremap(mem_phys, res_size, MEMREMAP_WC);
+		if (!mem_virt) {
+			ret = -ENOMEM;
+			goto err_release_fw;
+		}
 
-	if (!ret)
 		iris_detect_firmware(core, fw_name, mem_virt, res_size, desc);
-
-	memunmap(mem_virt);
+		memunmap(mem_virt);
+	}
 err_release_fw:
 	release_firmware(firmware);
 
@@ -233,7 +232,7 @@ int iris_fw_load(struct iris_core *core)
 		return ret;
 	}
 
-	ret = qcom_pas_auth_and_reset(IRIS_PAS_ID);
+	ret = qcom_pas_prepare_and_auth_reset(&core->pas_ctx);
 	if (ret)  {
 		dev_err(core->dev, "auth and reset failed: %d\n", ret);
 		return ret;
-- 
2.55.0