linux-kernel - Re: [PATCH v4] bus: mhi: host: fix endianness of BHI vector table

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Message-ID: <48a98603-d2b0-c279-6b04-0c89baf32d05@oss.qualcomm.com>
Date: Tue, 20 May 2025 09:34:00 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Alexander Wilhelm <alexander.wilhelm@...termo.com>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Jeff Hugo <jeff.hugo@....qualcomm.com>, mhi@...ts.linux.dev,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4] bus: mhi: host: fix endianness of BHI vector table



On 5/19/2025 8:28 PM, 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.
> 
> Fixes: 6cd330ae76ff ("bus: mhi: core: Add support for ringing channel/event ring doorbells")
> Signed-off-by: Alexander Wilhelm <alexander.wilhelm@...termo.com>
> Reviewed-by: Jeff Hugo <jeff.hugo@....qualcomm.com>
Reviewed-by: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
> ---
> Changes in v2:
>    - Set __le64 type for dma_addr and size.
> 
> Changes in v3:
>    - Improve the clarity of the commit message.
> 
> Changes in v4:
>    - Add missing fixes tag.
>    - Fix commit message character width.
> 
>   drivers/bus/mhi/host/boot.c     | 8 ++++----
>   drivers/bus/mhi/host/internal.h | 4 ++--
>   2 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/bus/mhi/host/boot.c b/drivers/bus/mhi/host/boot.c
> index efa3b6dddf4d..205d83ac069f 100644
> --- a/drivers/bus/mhi/host/boot.c
> +++ b/drivers/bus/mhi/host/boot.c
> @@ -31,8 +31,8 @@ int mhi_rddm_prepare(struct mhi_controller *mhi_cntrl,
>   	int ret;
>   
>   	for (i = 0; i < img_info->entries - 1; i++, mhi_buf++, bhi_vec++) {
> -		bhi_vec->dma_addr = mhi_buf->dma_addr;
> -		bhi_vec->size = mhi_buf->len;
> +		bhi_vec->dma_addr = cpu_to_le64(mhi_buf->dma_addr);
> +		bhi_vec->size = cpu_to_le64(mhi_buf->len);
>   	}
>   
>   	dev_dbg(dev, "BHIe programming for RDDM\n");
> @@ -431,8 +431,8 @@ static void mhi_firmware_copy_bhie(struct mhi_controller *mhi_cntrl,
>   	while (remainder) {
>   		to_cpy = min(remainder, mhi_buf->len);
>   		memcpy(mhi_buf->buf, buf, to_cpy);
> -		bhi_vec->dma_addr = mhi_buf->dma_addr;
> -		bhi_vec->size = to_cpy;
> +		bhi_vec->dma_addr = cpu_to_le64(mhi_buf->dma_addr);
> +		bhi_vec->size = cpu_to_le64(to_cpy);
>   
>   		buf += to_cpy;
>   		remainder -= to_cpy;
> diff --git a/drivers/bus/mhi/host/internal.h b/drivers/bus/mhi/host/internal.h
> index ce566f7d2e92..1dbc3f736161 100644
> --- a/drivers/bus/mhi/host/internal.h
> +++ b/drivers/bus/mhi/host/internal.h
> @@ -25,8 +25,8 @@ struct mhi_ctxt {
>   };
>   
>   struct bhi_vec_entry {
> -	u64 dma_addr;
> -	u64 size;
> +	__le64 dma_addr;
> +	__le64 size;
>   };
>   
>   enum mhi_fw_load_type {