linux-kernel - RE: [PATCH v4 20/23] iommu/tegra241-cmdqv: Simplify deinit flow in tegra241_cmdqv_remove

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Message-ID: <BN9PR11MB5276E43E56DBB09FA3D495118C90A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Thu, 15 May 2025 08:00:43 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>, "jgg@...dia.com" <jgg@...dia.com>,
	"corbet@....net" <corbet@....net>, "will@...nel.org" <will@...nel.org>
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Subject: RE: [PATCH v4 20/23] iommu/tegra241-cmdqv: Simplify deinit flow in
 tegra241_cmdqv_remove_vintf()

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Friday, May 9, 2025 11:03 AM
> 
> The current flow of tegra241_cmdqv_remove_vintf() is:
>  1. For each LVCMDQ, tegra241_vintf_remove_lvcmdq():
>     a. Disable the LVCMDQ HW
>     b. Release the LVCMDQ SW resource
>  2. For current VINTF, tegra241_vintf_hw_deinit():
>     c. Disable all LVCMDQ HWs
>     d. Disable VINTF HW
> 
> Obviously, the step 1.a and the step 2.c are redundant.
> 
> Since tegra241_vintf_hw_deinit() disables all of its LVCMDQ HWs, it could
> simplify the flow in tegra241_cmdqv_remove_vintf() by calling that first:
>  1. For current VINTF, tegra241_vintf_hw_deinit():
>     a. Disable all LVCMDQ HWs
>     b. Disable VINTF HW
>  2. Release all LVCMDQ SW resources
> 
> Drop tegra241_vintf_remove_lvcmdq(), and move
> tegra241_vintf_free_lvcmdq()
> as the new step 2.
> 
> Acked-by: Pranjal Shrivastava <praan@...gle.com>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>

Reviewed-by: Kevin Tian <kevin.tian@...el.com>