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From:   Kalle Valo <kvalo@kernel.org>
To:     Manikanta Pubbisetty <quic_mpubbise@quicinc.com>
Cc:     <ath11k@lists.infradead.org>, <linux-wireless@vger.kernel.org>,
        <devicetree@vger.kernel.org>, <robh@kernel.org>, <mka@chromium.org>
Subject: Re: [PATCH v4 04/12] ath11k: Add register access logic for WCN6750
References: <20220406094107.17878-1-quic_mpubbise@quicinc.com>
        <20220406094107.17878-5-quic_mpubbise@quicinc.com>
Date:   Wed, 27 Apr 2022 08:45:33 +0300
In-Reply-To: <20220406094107.17878-5-quic_mpubbise@quicinc.com> (Manikanta
        Pubbisetty's message of "Wed, 6 Apr 2022 15:10:58 +0530")
Message-ID: <87czh3gjuq.fsf@kernel.org>
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Manikanta Pubbisetty <quic_mpubbise@quicinc.com> writes:

> WCN6750 uses static window mapping to access the HW registers.
> Unlike QCN9074 which uses 2nd window for CE and 3rd window
> for UMAC register accesses, WCN6750 uses 1st window for UMAC
> and 2nd window for CE registers.
>
> Code is refactored so that WCN6750 can use the existing
> ath11k_pci_read/write() APIs for accessing the registers.
>
> Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-00573-QCAMSLSWPLZ-1
> Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-01720.1-QCAHSPSWPL_V1_V2_SILICONZ_LITE-1
> Tested-on: QCN9074 hw1.0 PCI WLAN.HK.2.5.0.1-01100-QCAHKSWPL_SILICONZ-1
> Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.4.0.1-00192-QCAHKSWPL_SILICONZ-1
>
> Signed-off-by: Manikanta Pubbisetty <quic_mpubbise@quicinc.com>
> ---
>  drivers/net/wireless/ath/ath11k/ahb.c  |  3 ++
>  drivers/net/wireless/ath/ath11k/core.h |  2 +
>  drivers/net/wireless/ath/ath11k/pci.c  |  4 ++
>  drivers/net/wireless/ath/ath11k/pcic.c | 53 +++++++++-----------------
>  4 files changed, 28 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
> index d73643e3e8dd..d27fc7276977 100644
> --- a/drivers/net/wireless/ath/ath11k/ahb.c
> +++ b/drivers/net/wireless/ath/ath11k/ahb.c
> @@ -42,6 +42,9 @@ const struct ath11k_bus_params ath11k_ahb_hybrid_bus_params = {
>  	.fixed_bdf_addr = false,
>  	.fixed_mem_region = false,
>  	.hybrid_bus_type = true,
> +	.static_window_map = true,
> +	.dp_window_idx = 1,
> +	.ce_window_idx = 2,
>  };

Even if the values are zero, please initialise the new fields in every
bus_params structure:

ahb.c:31:static const struct ath11k_bus_params ath11k_ahb_bus_params = {
pci.c:118:static const struct ath11k_bus_params ath11k_pci_bus_params = {

> --- a/drivers/net/wireless/ath/ath11k/pci.c
> +++ b/drivers/net/wireless/ath/ath11k/pci.c
> @@ -771,6 +771,10 @@ static int ath11k_pci_probe(struct pci_dev *pdev,
>  		ab->bus_params.static_window_map = true;
>  		ab->pci.ops = &ath11k_pci_ops_qcn9074;
>  		ab->hw_rev = ATH11K_HW_QCN9074_HW10;
> +
> +		/* For QCN9074, CE: 2nd window, UMAC: 3rd window */
> +		ab->bus_params.ce_window_idx = 2;
> +		ab->bus_params.dp_window_idx = 3;

Bus params are supposed to be const so that you cannot change them. If
there are device specific attributes they should be in hw_params.

I see now that both hw_params and bus_params are not const in struct
ath11k_base and that's why you were able to change them:

	struct ath11k_hw_params hw_params;
	struct ath11k_bus_params bus_params;

I'll send a separate patch to fix that.

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