linux-kernel - [PATCH AUTOSEL 5.4 18/40] PCI: Add a REBAR size quirk for Sapphire RX 5600 XT Pulse

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Message-Id: <20210224125340.483162-18-sashal@kernel.org>
Date:   Wed, 24 Feb 2021 07:53:18 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Nirmoy Das <nirmoy.das@....com>,
        Christian König <christian.koenig@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Sasha Levin <sashal@...nel.org>, linux-pci@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 18/40] PCI: Add a REBAR size quirk for Sapphire RX 5600 XT Pulse

From: Nirmoy Das <nirmoy.das@....com>

[ Upstream commit 907830b0fc9e374d00f3c83de5e426157b482c01 ]

RX 5600 XT Pulse advertises support for BAR 0 being 256MB, 512MB,
or 1GB, but it also supports 2GB, 4GB, and 8GB. Add a rebar
size quirk so that the BAR 0 is big enough to cover complete VARM.

Signed-off-by: Christian König <christian.koenig@....com>
Signed-off-by: Nirmoy Das <nirmoy.das@....com>
Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/20210107175017.15893-5-nirmoy.das@amd.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/pci/pci.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 89dece8a41321..9add26438be50 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3471,7 +3471,14 @@ u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar)
 		return 0;
 
 	pci_read_config_dword(pdev, pos + PCI_REBAR_CAP, &cap);
-	return (cap & PCI_REBAR_CAP_SIZES) >> 4;
+	cap &= PCI_REBAR_CAP_SIZES;
+
+	/* Sapphire RX 5600 XT Pulse has an invalid cap dword for BAR 0 */
+	if (pdev->vendor == PCI_VENDOR_ID_ATI && pdev->device == 0x731f &&
+	    bar == 0 && cap == 0x7000)
+		cap = 0x3f000;
+
+	return cap >> 4;
 }
 
 /**
-- 
2.27.0