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44 lines
1.8 KiB
Diff
44 lines
1.8 KiB
Diff
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From 994818d7302f5e26644f6571183455da1d95e742 Mon Sep 17 00:00:00 2001
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From: Nick Hollinghurst <nick.hollinghurst@raspberrypi.com>
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Date: Tue, 13 Feb 2024 17:09:47 +0000
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Subject: [PATCH 0895/1085] PCI: brcmstb: Set new flags to avoid QOS "holes" on
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BCM2712D0
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Set some flags present (and recommended) in 2712D0, but missing
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(and harmless) in 2712C1. In particular, EN_QOS_UPDATE_TIMING_FIX
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must be set to avoid spurious QOS=0 when the queue changes from
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empty to non-empty, to make D0 match the existing C1 behaviour.
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Not enabling "QOS forwarding", which still seems not to help.
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Signed-off-by: Nick Hollinghurst <nick.hollinghurst@raspberrypi.com>
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---
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drivers/pci/controller/pcie-brcmstb.c | 7 ++++++-
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1 file changed, 6 insertions(+), 1 deletion(-)
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--- a/drivers/pci/controller/pcie-brcmstb.c
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+++ b/drivers/pci/controller/pcie-brcmstb.c
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@@ -199,6 +199,9 @@
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#define VDM_PRIORITY_TO_QOS_MAP_MASK 0xf
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#define PCIE_MISC_AXI_INTF_CTRL 0x416C
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+#define AXI_EN_RCLK_QOS_ARRAY_FIX BIT(13)
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+#define AXI_EN_QOS_UPDATE_TIMING_FIX BIT(12)
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+#define AXI_DIS_QOS_GATING_IN_MASTER BIT(11)
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#define AXI_REQFIFO_EN_QOS_PROPAGATION BIT(7)
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#define AXI_BRIDGE_LOW_LATENCY_MODE BIT(6)
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#define AXI_MASTER_MAX_OUTSTANDING_REQUESTS_MASK 0x3f
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@@ -558,9 +561,11 @@ static void brcm_pcie_set_tc_qos(struct
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if (pcie->type != BCM2712)
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return;
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- /* XXX: BCM2712C0 is broken, disable the forwarding search */
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+ /* Disable broken QOS forwarding search. Set chicken bits for 2712D0 */
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reg = readl(pcie->base + PCIE_MISC_AXI_INTF_CTRL);
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reg &= ~AXI_REQFIFO_EN_QOS_PROPAGATION;
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+ reg |= AXI_EN_RCLK_QOS_ARRAY_FIX | AXI_EN_QOS_UPDATE_TIMING_FIX |
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+ AXI_DIS_QOS_GATING_IN_MASTER;
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writel(reg, pcie->base + PCIE_MISC_AXI_INTF_CTRL);
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/* Disable VDM reception by default - QoS map defaults to 0 */
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