From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: Shawn Guo <shawn.guo@linaro.org>
Cc: Will Deacon <will@kernel.org>,
Robin Murphy <robin.murphy@arm.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Hanjun Guo <guohanjun@huawei.com>,
Sudeep Holla <sudeep.holla@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH v3] iommu/arm-smmu-qcom: hook up qcom_smmu_impl for ACPI boot
Date: Mon, 24 May 2021 22:58:45 -0500 [thread overview]
Message-ID: <YKx19fppKVGXhH45@yoga> (raw)
In-Reply-To: <20210509022607.17534-1-shawn.guo@linaro.org>
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 <bjorn.andersson@linaro.org>
Regards,
Bjorn
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> ---
> 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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next prev parent reply other threads:[~2021-05-25 4:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-09 2:26 [PATCH v3] iommu/arm-smmu-qcom: hook up qcom_smmu_impl for ACPI boot Shawn Guo
2021-05-23 6:05 ` Shawn Guo
2021-05-24 12:09 ` Robin Murphy
2021-05-25 3:58 ` Bjorn Andersson [this message]
2021-06-08 11:42 ` Will Deacon
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