linux-kernel - [RFC PATCH 05/17] net: ipa: Check interrupts for availability

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Date:   Mon, 20 Sep 2021 08:37:59 +0530
From:   Sireesh Kodali <sireeshkodali1@...il.com>
To:     phone-devel@...r.kernel.org, ~postmarketos/upstreaming@...ts.sr.ht,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, elder@...nel.org
Cc:     Vladimir Lypak <vladimir.lypak@...il.com>,
        Sireesh Kodali <sireeshkodali1@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Subject: [RFC PATCH 05/17] net: ipa: Check interrupts for availability

From: Vladimir Lypak <vladimir.lypak@...il.com>

Make ipa_interrupt_add/ipa_interrupt_remove no-operation if requested
interrupt is not supported by IPA hardware.

Signed-off-by: Vladimir Lypak <vladimir.lypak@...il.com>
Signed-off-by: Sireesh Kodali <sireeshkodali1@...il.com>
---
 drivers/net/ipa/ipa_interrupt.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/net/ipa/ipa_interrupt.c b/drivers/net/ipa/ipa_interrupt.c
index b35170a93b0f..94708a23a597 100644
--- a/drivers/net/ipa/ipa_interrupt.c
+++ b/drivers/net/ipa/ipa_interrupt.c
@@ -48,6 +48,25 @@ static bool ipa_interrupt_uc(struct ipa_interrupt *interrupt, u32 irq_id)
 	return irq_id == IPA_IRQ_UC_0 || irq_id == IPA_IRQ_UC_1;
 }
 
+static bool ipa_interrupt_check_fixup(enum ipa_irq_id *irq_id, enum ipa_version version)
+{
+	switch (*irq_id) {
+	case IPA_IRQ_EOT_COAL:
+		return version < IPA_VERSION_3_5;
+	case IPA_IRQ_DCMP:
+		return version < IPA_VERSION_4_5;
+	case IPA_IRQ_TLV_LEN_MIN_DSM:
+		return version >= IPA_VERSION_4_5;
+	default:
+		break;
+	}
+
+	if (*irq_id >= IPA_IRQ_DRBIP_PKT_EXCEED_MAX_SIZE_EN)
+		return version >= IPA_VERSION_4_9;
+
+	return true;
+}
+
 /* Process a particular interrupt type that has been received */
 static void ipa_interrupt_process(struct ipa_interrupt *interrupt, u32 irq_id)
 {
@@ -191,6 +210,9 @@ void ipa_interrupt_add(struct ipa_interrupt *interrupt,
 	struct ipa *ipa = interrupt->ipa;
 	u32 offset;
 
+	if (!ipa_interrupt_check_fixup(&ipa_irq, ipa->version))
+		return;
+
 	WARN_ON(ipa_irq >= IPA_IRQ_COUNT);
 
 	interrupt->handler[ipa_irq] = handler;
@@ -208,6 +230,9 @@ ipa_interrupt_remove(struct ipa_interrupt *interrupt, enum ipa_irq_id ipa_irq)
 	struct ipa *ipa = interrupt->ipa;
 	u32 offset;
 
+	if (!ipa_interrupt_check_fixup(&ipa_irq, ipa->version))
+		return;
+
 	WARN_ON(ipa_irq >= IPA_IRQ_COUNT);
 
 	/* Update the IPA interrupt mask to disable it */
-- 
2.33.0