Re: [PATCH 3/8] media: iris: migrate firmware loading to qcom_mdt_pas_load() and qcom_pas_prepare_and_auth_reset()

[Gourav Kumar <gourav.kumar@oss.qualcomm.com>]

On 9/25/2026 9:27 PM, Mukesh Ojha wrote:
> iris_load_fw_to_memory() calls qcom_mdt_load() which bundles metadata
> init, memory setup, and segment loading with no PAS context, and
> iris_fw_load() calls qcom_pas_auth_and_reset() which skips the shmbridge
> prepare step required before TrustZone authentication.
> 
> Since the auth call is in a different function from where the PAS context
> is allocated, add a pas_ctx pointer to struct iris_core so it can be
> threaded between the two call sites.  Replace qcom_mdt_load() with
> devm_qcom_pas_context_alloc() and qcom_mdt_pas_load() in
> iris_load_fw_to_memory(), storing the context in core->pas_ctx, then
> pass it to qcom_pas_prepare_and_auth_reset() in iris_fw_load().
> 
> 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  | 20 ++++++++-----------
>  2 files changed, 10 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_core.h b/drivers/media/platform/qcom/iris/iris_core.h
> index 24da60448cf2..68e6adcc1dfd 100644
> --- a/drivers/media/platform/qcom/iris/iris_core.h
> +++ b/drivers/media/platform/qcom/iris/iris_core.h
> @@ -8,6 +8,7 @@
>  
>  #include <linux/types.h>
>  #include <linux/pm_domain.h>
> +#include <linux/firmware/qcom/qcom_pas.h>
>  #include <media/v4l2-device.h>
>  
>  #include "iris_hfi_common.h"
> @@ -123,6 +124,7 @@ struct iris_core {
>  	/* encoder and decoder have overlapping caps, so two different arrays are required */
>  	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 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 21cdf1c39835..e73a5dd98b88 100644
> --- a/drivers/media/platform/qcom/iris/iris_firmware.c
> +++ b/drivers/media/platform/qcom/iris/iris_firmware.c
> @@ -115,9 +115,7 @@ static int iris_load_fw_to_memory(struct iris_core *core)
>  	struct resource res;
>  	phys_addr_t mem_phys;
>  	const char *fw_name;
> -	size_t res_size;
>  	ssize_t fw_size;
> -	void *mem_virt;
>  	int ret;
>  
>  	ret = of_reserved_mem_region_to_resource(dev->of_node, 0, &res);
> @@ -125,7 +123,6 @@ static int iris_load_fw_to_memory(struct iris_core *core)
>  		return ret;
>  
>  	mem_phys = res.start;
> -	res_size = resource_size(&res);
>  
>  	firmware = iris_detect_firmware(core, &fw_name);
>  	if (IS_ERR(firmware))
> @@ -134,21 +131,20 @@ static int iris_load_fw_to_memory(struct iris_core *core)
>  	core->iris_firmware_data = core->iris_firmware_desc->firmware_data;
>  
>  	fw_size = qcom_mdt_get_size(firmware);
> -	if (fw_size < 0 || res_size < (size_t)fw_size) {
> +	if (fw_size < 0 || resource_size(&res) < (size_t)fw_size) {
>  		ret = -EINVAL;
>  		goto err_release_fw;
>  	}
>  
> -	mem_virt = memremap(mem_phys, res_size, MEMREMAP_WC);
> -	if (!mem_virt) {
> -		ret = -ENOMEM;
> +	core->pas_ctx = devm_qcom_pas_context_alloc(dev, IRIS_PAS_ID, mem_phys,
> +						    resource_size(&res));
> +	if (IS_ERR(core->pas_ctx)) {
> +		ret = PTR_ERR(core->pas_ctx);
> +		core->pas_ctx = NULL;
>  		goto err_release_fw;
>  	}
>  
> -	ret = qcom_mdt_load(dev, firmware, fw_name,
> -			    IRIS_PAS_ID, mem_virt, mem_phys, res_size, NULL);
> -
> -	memunmap(mem_virt);
> +	ret = qcom_mdt_pas_load(core->pas_ctx, firmware, fw_name, NULL);

qcom_mdt_pas_load() passes the ctx to qcom_pas_init_image(), which keeps
the metadata buffer in ctx->ptr, and qcom_pas_prepare_and_auth_reset()
does not free it. Who is expected to call qcom_pas_metadata_release()
for iris? I don't see it called after authentication (or on its
failure), unlike in qcom_q6v5_pas.c.

Gourav Kumar

>  err_release_fw:
>  	release_firmware(firmware);
>  
> @@ -166,7 +162,7 @@ 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);

ctx->use_tzmem is not set for iris, so the shmbridge creation in
qcom_scm_pas_prepare_and_auth_reset() is skipped and the behaviour is
the same as the old qcom_pas_auth_and_reset(). Please reword the commit
message accordingly, since it currently implies that the prepare step is
now performed by the new API as a fix.

Gourav Kumar

>  	if (ret)  {
>  		dev_err(core->dev, "auth and reset failed: %d\n", ret);
>  		return ret;