linux-kernel - Re: [PATCH v2] bus: mhi: host: fix endianness of BHI vector table

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Message-ID: <fa6e5f45-a6d9-4f31-ab5a-7c47200a913c@oss.qualcomm.com>
Date: Fri, 16 May 2025 09:13:46 -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 v2] bus: mhi: host: fix endianness of BHI vector table

On 5/15/2025 3:55 AM, Alexander Wilhelm wrote:
> On big endian platforms like PowerPC the DMA address and size are required
> to be swapped. Otherwise 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
> 

Fixes?

> Signed-off-by: Alexander Wilhelm <alexander.wilhelm@...termo.com>

Reviewed-by: Jeff Hugo <jeff.hugo@....qualcomm.com>