linux-kernel - [PATCH 6/6] pci/hotplug/pnv_php: Enable third attention indicator

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Message-ID: <1984998826.1309773.1750220641884.JavaMail.zimbra@raptorengineeringinc.com>
Date: Tue, 17 Jun 2025 23:24:01 -0500 (CDT)
From: Timothy Pearson <tpearson@...torengineering.com>
To: linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Cc: linux-kernel <linux-kernel@...r.kernel.org>, 
	linux-pci <linux-pci@...r.kernel.org>, 
	Timothy Pearson <tpearson@...torengineering.com>, 
	Madhavan Srinivasan <maddy@...ux.ibm.com>, 
	Michael Ellerman <mpe@...erman.id.au>, 
	christophe leroy <christophe.leroy@...roup.eu>, 
	Naveen N Rao <naveen@...nel.org>, 
	Bjorn Helgaas <bhelgaas@...gle.com>, 
	Shawn Anastasio <sanastasio@...torengineering.com>
Subject: [PATCH 6/6] pci/hotplug/pnv_php: Enable third attention indicator

 state

The PCIe specification allows three attention indicator states,
on, off, and blink.  Enable all three states instead of basic
on / off control.

Signed-off-by: Timothy Pearson <tpearson@...torengineering.com>
---
 drivers/pci/hotplug/pnv_php.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/hotplug/pnv_php.c b/drivers/pci/hotplug/pnv_php.c
index 32f26f0d1ca6..c9003dec91c3 100644
--- a/drivers/pci/hotplug/pnv_php.c
+++ b/drivers/pci/hotplug/pnv_php.c
@@ -3,6 +3,7 @@
  * PCI Hotplug Driver for PowerPC PowerNV platform.
  *
  * Copyright Gavin Shan, IBM Corporation 2016.
+ * Copyright (C) 2025 Raptor Engineering, LLC
  */
 
 #include <linux/bitfield.h>
@@ -439,10 +440,23 @@ static int pnv_php_get_adapter_state(struct hotplug_slot *slot, u8 *state)
 	return ret;
 }
 
+static int pnv_php_get_raw_indicator_status(struct hotplug_slot *slot, u8 *state)
+{
+	struct pnv_php_slot *php_slot = to_pnv_php_slot(slot);
+	struct pci_dev *bridge = php_slot->pdev;
+	u16 status;
+
+	pcie_capability_read_word(bridge, PCI_EXP_SLTCTL, &status);
+	*state = (status & (PCI_EXP_SLTCTL_AIC | PCI_EXP_SLTCTL_PIC)) >> 6;
+	return 0;
+}
+
+
 static int pnv_php_get_attention_state(struct hotplug_slot *slot, u8 *state)
 {
 	struct pnv_php_slot *php_slot = to_pnv_php_slot(slot);
 
+	pnv_php_get_raw_indicator_status(slot, &php_slot->attention_state);
 	*state = php_slot->attention_state;
 	return 0;
 }
@@ -460,7 +474,7 @@ static int pnv_php_set_attention_state(struct hotplug_slot *slot, u8 state)
 	mask = PCI_EXP_SLTCTL_AIC;
 
 	if (state)
-		new = PCI_EXP_SLTCTL_ATTN_IND_ON;
+		new = FIELD_PREP(PCI_EXP_SLTCTL_AIC, state);
 	else
 		new = PCI_EXP_SLTCTL_ATTN_IND_OFF;
 
-- 
2.39.5