This is a note to let you know that I've just added the patch titled
PCI: rockchip: Fix legacy IRQ generation for RK3399 PCIe endpoint core
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
pci-rockchip-fix-legacy-irq-generation-for-rk3399-pcie-endpoint-core.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 166e89d99dd85a856343cca51eee781b793801f2 Mon Sep 17 00:00:00 2001
From: Rick Wertenbroek <rick.wertenbroek@xxxxxxxxx>
Date: Tue, 18 Apr 2023 09:46:54 +0200
Subject: PCI: rockchip: Fix legacy IRQ generation for RK3399 PCIe endpoint core
From: Rick Wertenbroek <rick.wertenbroek@xxxxxxxxx>
commit 166e89d99dd85a856343cca51eee781b793801f2 upstream.
Fix legacy IRQ generation for RK3399 PCIe endpoint core according to
the technical reference manual (TRM). Assert and deassert legacy
interrupt (INTx) through the legacy interrupt control register
("PCIE_CLIENT_LEGACY_INT_CTRL") instead of manually generating a PCIe
message. The generation of the legacy interrupt was tested and validated
with the PCIe endpoint test driver.
Link: https://lore.kernel.org/r/20230418074700.1083505-8-rick.wertenbroek@xxxxxxxxx
Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller")
Tested-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Signed-off-by: Rick Wertenbroek <rick.wertenbroek@xxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lpieralisi@xxxxxxxxxx>
Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/pci/controller/pcie-rockchip-ep.c | 45 +++++++-----------------------
drivers/pci/controller/pcie-rockchip.h | 6 +++-
2 files changed, 16 insertions(+), 35 deletions(-)
--- a/drivers/pci/controller/pcie-rockchip-ep.c
+++ b/drivers/pci/controller/pcie-rockchip-ep.c
@@ -347,48 +347,25 @@ static int rockchip_pcie_ep_get_msi(stru
}
static void rockchip_pcie_ep_assert_intx(struct rockchip_pcie_ep *ep, u8 fn,
- u8 intx, bool is_asserted)
+ u8 intx, bool do_assert)
{
struct rockchip_pcie *rockchip = &ep->rockchip;
- u32 r = ep->max_regions - 1;
- u32 offset;
- u32 status;
- u8 msg_code;
-
- if (unlikely(ep->irq_pci_addr != ROCKCHIP_PCIE_EP_PCI_LEGACY_IRQ_ADDR ||
- ep->irq_pci_fn != fn)) {
- rockchip_pcie_prog_ep_ob_atu(rockchip, fn, r,
- AXI_WRAPPER_NOR_MSG,
- ep->irq_phys_addr, 0, 0);
- ep->irq_pci_addr = ROCKCHIP_PCIE_EP_PCI_LEGACY_IRQ_ADDR;
- ep->irq_pci_fn = fn;
- }
intx &= 3;
- if (is_asserted) {
+
+ if (do_assert) {
ep->irq_pending |= BIT(intx);
- msg_code = ROCKCHIP_PCIE_MSG_CODE_ASSERT_INTA + intx;
+ rockchip_pcie_write(rockchip,
+ PCIE_CLIENT_INT_IN_ASSERT |
+ PCIE_CLIENT_INT_PEND_ST_PEND,
+ PCIE_CLIENT_LEGACY_INT_CTRL);
} else {
ep->irq_pending &= ~BIT(intx);
- msg_code = ROCKCHIP_PCIE_MSG_CODE_DEASSERT_INTA + intx;
+ rockchip_pcie_write(rockchip,
+ PCIE_CLIENT_INT_IN_DEASSERT |
+ PCIE_CLIENT_INT_PEND_ST_NORMAL,
+ PCIE_CLIENT_LEGACY_INT_CTRL);
}
-
- status = rockchip_pcie_read(rockchip,
- ROCKCHIP_PCIE_EP_FUNC_BASE(fn) +
- ROCKCHIP_PCIE_EP_CMD_STATUS);
- status &= ROCKCHIP_PCIE_EP_CMD_STATUS_IS;
-
- if ((status != 0) ^ (ep->irq_pending != 0)) {
- status ^= ROCKCHIP_PCIE_EP_CMD_STATUS_IS;
- rockchip_pcie_write(rockchip, status,
- ROCKCHIP_PCIE_EP_FUNC_BASE(fn) +
- ROCKCHIP_PCIE_EP_CMD_STATUS);
- }
-
- offset =
- ROCKCHIP_PCIE_MSG_ROUTING(ROCKCHIP_PCIE_MSG_ROUTING_LOCAL_INTX) |
- ROCKCHIP_PCIE_MSG_CODE(msg_code) | ROCKCHIP_PCIE_MSG_NO_DATA;
- writel(0, ep->irq_cpu_addr + offset);
}
static int rockchip_pcie_ep_send_legacy_irq(struct rockchip_pcie_ep *ep, u8 fn,
--- a/drivers/pci/controller/pcie-rockchip.h
+++ b/drivers/pci/controller/pcie-rockchip.h
@@ -38,6 +38,11 @@
#define PCIE_CLIENT_MODE_EP HIWORD_UPDATE(0x0040, 0)
#define PCIE_CLIENT_GEN_SEL_1 HIWORD_UPDATE(0x0080, 0)
#define PCIE_CLIENT_GEN_SEL_2 HIWORD_UPDATE_BIT(0x0080)
+#define PCIE_CLIENT_LEGACY_INT_CTRL (PCIE_CLIENT_BASE + 0x0c)
+#define PCIE_CLIENT_INT_IN_ASSERT HIWORD_UPDATE_BIT(0x0002)
+#define PCIE_CLIENT_INT_IN_DEASSERT HIWORD_UPDATE(0x0002, 0)
+#define PCIE_CLIENT_INT_PEND_ST_PEND HIWORD_UPDATE_BIT(0x0001)
+#define PCIE_CLIENT_INT_PEND_ST_NORMAL HIWORD_UPDATE(0x0001, 0)
#define PCIE_CLIENT_SIDE_BAND_STATUS (PCIE_CLIENT_BASE + 0x20)
#define PCIE_CLIENT_PHY_ST BIT(12)
#define PCIE_CLIENT_DEBUG_OUT_0 (PCIE_CLIENT_BASE + 0x3c)
@@ -227,7 +232,6 @@
#define ROCKCHIP_PCIE_EP_MSI_CTRL_ME BIT(16)
#define ROCKCHIP_PCIE_EP_MSI_CTRL_MASK_MSI_CAP BIT(24)
#define ROCKCHIP_PCIE_EP_DUMMY_IRQ_ADDR 0x1
-#define ROCKCHIP_PCIE_EP_PCI_LEGACY_IRQ_ADDR 0x3
#define ROCKCHIP_PCIE_EP_FUNC_BASE(fn) (((fn) << 12) & GENMASK(19, 12))
#define ROCKCHIP_PCIE_AT_IB_EP_FUNC_BAR_ADDR0(fn, bar) \
(PCIE_RC_RP_ATS_BASE + 0x0840 + (fn) * 0x0040 + (bar) * 0x0008)
Patches currently in stable-queue which might be from rick.wertenbroek@xxxxxxxxx are
queue-6.4/pci-rockchip-use-u32-variable-to-access-32-bit-registers.patch
queue-6.4/pci-rockchip-assert-pci-configuration-enable-bit-after-probe.patch
queue-6.4/pci-rockchip-fix-legacy-irq-generation-for-rk3399-pcie-endpoint-core.patch
queue-6.4/pci-rockchip-add-poll-and-timeout-to-wait-for-phy-plls-to-be-locked.patch
queue-6.4/pci-rockchip-write-pci-device-id-to-correct-register.patch
queue-6.4/pci-rockchip-set-address-alignment-for-endpoint-mode.patch
