Subject: Re: [PATCH v3] iommu/arm-smmu-qcom: hook up qcom_smmu_impl for ACPI boot

From: Bjorn Andersson <[email-masked]>
Date: Mon, 24 May 2021 22:58:45 -0500

On Sat 08 May 21:26 CDT 2021, Shawn Guo wrote:

> The hookup with qcom_smmu_impl is required to do ACPI boot on SC8180X
> based devices like Lenovo Flex 5G laptop and Microsoft Surface Pro X.
> Define acpi_platform_list for these platforms and match them using
> acpi_match_platform_list() call, and create qcom_smmu_impl accordingly.
> 
> (np == NULL) is used to check ACPI boot, because fwnode of SMMU device
> is a static allocation and thus helpers like has_acpi_companion() don't
> work here.
> 

Reviewed-by: Bjorn Andersson <[email-masked]>

Regards,
Bjorn

> Signed-off-by: Shawn Guo <[email-masked]>
> ---
> Changes for v3:
>  - Call acpi_match_platform_list() to match platform in qcom smmu
>    driver rather than IORT code.
> 
> Changes for v2:
>  - Rather than using asl_compiler_id in IORT table, follow suggestion
>    from Robin Murphy to use acpi_match_platform_list() to match platform.
> 
>  drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> index 98b3a1c2a181..f7e187f3fa66 100644
> --- a/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> +++ b/drivers/iommu/arm/arm-smmu/arm-smmu-qcom.c
> @@ -3,6 +3,7 @@
>   * Copyright (c) 2019, The Linux Foundation. All rights reserved.
>   */
>  
> +#include <linux/acpi.h>
>  #include <linux/adreno-smmu-priv.h>
>  #include <linux/of_device.h>
>  #include <linux/qcom_scm.h>
> @@ -339,10 +340,22 @@ static const struct of_device_id __maybe_unused qcom_smmu_impl_of_match[] = {
>  	{ }
>  };
>  
> +static struct acpi_platform_list qcom_acpi_platlist[] = {
> +	{ "LENOVO", "CB-01   ", 0x8180, ACPI_SIG_IORT, equal, "QCOM SMMU" },
> +	{ "QCOM  ", "QCOMEDK2", 0x8180, ACPI_SIG_IORT, equal, "QCOM SMMU" },
> +	{ }
> +};
> +
>  struct arm_smmu_device *qcom_smmu_impl_init(struct arm_smmu_device *smmu)
>  {
>  	const struct device_node *np = smmu->dev->of_node;
>  
> +	if (np == NULL) {
> +		/* Match platform for ACPI boot */
> +		if (acpi_match_platform_list(qcom_acpi_platlist) >= 0)
> +			return qcom_smmu_create(smmu, &qcom_smmu_impl);
> +	}
> +
>  	if (of_match_node(qcom_smmu_impl_of_match, np))
>  		return qcom_smmu_create(smmu, &qcom_smmu_impl);
>  
> -- 
> 2.17.1
> 

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