linux-kernel - [PATCH 1/2] wifi: ath11k: Use platform_get

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Message-Id: <20230124110057.1.I69cf3d56c97098287fe3a70084ee515098390b70@changeid>
Date:   Tue, 24 Jan 2023 11:01:00 -0800
From:   Douglas Anderson <dianders@...omium.org>
To:     ath11k@...ts.infradead.org, linux-wireless@...r.kernel.org
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        Nick Kossifidis <mickflemm@...il.com>,
        Youghandhar Chintala <quic_youghand@...cinc.com>,
        junyuu@...omium.org, Kalle Valo <kvalo@...nel.org>,
        Jiri Slaby <jirislaby@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Manikanta Pubbisetty <quic_mpubbise@...cinc.com>,
        Paolo Abeni <pabeni@...hat.com>, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH 1/2] wifi: ath11k: Use platform_get_irq() to get the interrupt

For the same reasons talked about in commit 9503a1fc123d ("ath9k: Use
platform_get_irq() to get the interrupt"), we should be using
platform_get_irq() in ath11k. Let's make the switch.

Without this change, WiFi wasn't coming up on my Qualcomm sc7280-based
hardware. Specifically, "platform_get_resource(pdev, IORESOURCE_IRQ,
i)" was failing even for i=0. Digging into the platform device there
truly were no IRQs present in the list of resources when the call was
made.

I didn't dig into what changed between 5.15 (where
platform_get_resource() seems to work) and mainline Linux (where it
doesn't). Given the zeal robot report for ath9k I assume it's a known
issue. I'll mark this as "fixing" the patch that introduced the
platform_get_resource() call since it should have always been fine to
just call platform_get_irq() and that'll make sure it goes back as far
as it needs to go.

Tested-on: WCN6750 hw1.0 AHB WLAN.MSL.1.0.1-00887-QCAMSLSWPLZ-1

Fixes: 00402f49d26f ("ath11k: Add support for WCN6750 device")
Signed-off-by: Douglas Anderson <dianders@...omium.org>
---

 drivers/net/wireless/ath/ath11k/ahb.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
index d34a4d6325b2..f70a119bb5c8 100644
--- a/drivers/net/wireless/ath/ath11k/ahb.c
+++ b/drivers/net/wireless/ath/ath11k/ahb.c
@@ -859,11 +859,11 @@ static int ath11k_ahb_setup_msi_resources(struct ath11k_base *ab)
 	ab->pci.msi.ep_base_data = int_prop + 32;

 	for (i = 0; i < ab->pci.msi.config->total_vectors; i++) {
-		res = platform_get_resource(pdev, IORESOURCE_IRQ, i);
-		if (!res)
-			return -ENODEV;
+		ret = platform_get_irq(pdev, i);
+		if (ret < 0)
+			return ret;

-		ab->pci.msi.irqs[i] = res->start;
+		ab->pci.msi.irqs[i] = ret;
 	}

 	set_bit(ATH11K_FLAG_MULTI_MSI_VECTORS, &ab->dev_flags);
-- 
2.39.1.405.gd4c25cc71f-goog