linux-kernel - Re: [PATCH v3] bus: mhi: host: fix endianness of BHI vector table

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Message-ID: <cf4adaba-5601-40b9-bd17-1b1bfa686b0f@oss.qualcomm.com>
Date: Mon, 19 May 2025 08:13:00 -0600
From: Jeff Hugo <jeff.hugo@....qualcomm.com>
To: Alexander Wilhelm <alexander.wilhelm@...termo.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] bus: mhi: host: fix endianness of BHI vector table

On 5/19/2025 12:10 AM, Alexander Wilhelm wrote:
> On big endian platform like PowerPC the MHI bus does not start properly. The
> following example shows the error messages by using qcn9274 wireless radio
> module with ath12k driver:
> 
>      ath12k_pci 0001:01:00.0: BAR 0: assigned [mem 0xc00000000-0xc001fffff 64bit]
>      ath12k_pci 0001:01:00.0: MSI vectors: 1
>      ath12k_pci 0001:01:00.0: Hardware name: qcn9274 hw2.0
>      ath12k_pci 0001:01:00.0: failed to set mhi state: POWER_ON(2)
>      ath12k_pci 0001:01:00.0: failed to start mhi: -110
>      ath12k_pci 0001:01:00.0: failed to power up :-110
>      ath12k_pci 0001:01:00.0: failed to create soc core: -110
>      ath12k_pci 0001:01:00.0: failed to init core: -110
>      ath12k_pci: probe of 0001:01:00.0 failed with error -110
> 
> Fix it by swapping DMA address and size of the BHI vector table.
> 
> Signed-off-by: Alexander Wilhelm <alexander.wilhelm@...termo.com>
> Reviewed-by: Jeff Hugo <jeff.hugo@....qualcomm.com>

Shouldn't there be a fixes tag?  Probably pointing to one of the 
original MHI commits given what this change is touching.

-Jeff