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.
Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller") Cc: stable@vger.kernel.org Signed-off-by: Rick Wertenbroek rick.wertenbroek@gmail.com --- drivers/pci/controller/pcie-rockchip-ep.c | 38 +++++------------------ drivers/pci/controller/pcie-rockchip.h | 6 ++++ 2 files changed, 14 insertions(+), 30 deletions(-)
diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c index cbc281a6a..ca5b363ba 100644 --- a/drivers/pci/controller/pcie-rockchip-ep.c +++ b/drivers/pci/controller/pcie-rockchip-ep.c @@ -328,45 +328,23 @@ static void rockchip_pcie_ep_assert_intx(struct rockchip_pcie_ep *ep, u8 fn, u8 intx, bool is_asserted) { 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) { ep->irq_pending |= BIT(intx); - msg_code = ROCKCHIP_PCIE_MSG_CODE_ASSERT_INTA + intx; } else { ep->irq_pending &= ~BIT(intx); - msg_code = ROCKCHIP_PCIE_MSG_CODE_DEASSERT_INTA + intx; }
- 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); + if (is_asserted) { + rockchip_pcie_write(rockchip, + PCIE_CLIENT_INT_IN_ASSERT | PCIE_CLIENT_INT_PEND_ST_PEND, + PCIE_CLIENT_LEGACY_INT_CTRL); + } else { + rockchip_pcie_write(rockchip, + PCIE_CLIENT_INT_IN_DEASSERT | PCIE_CLIENT_INT_PEND_ST_NORMAL, + PCIE_CLIENT_LEGACY_INT_CTRL); } - - 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, diff --git a/drivers/pci/controller/pcie-rockchip.h b/drivers/pci/controller/pcie-rockchip.h index 72e427a0f..e90c2a2b8 100644 --- a/drivers/pci/controller/pcie-rockchip.h +++ b/drivers/pci/controller/pcie-rockchip.h @@ -39,6 +39,12 @@ #define PCIE_CLIENT_GEN_SEL_1 HIWORD_UPDATE(0x0080, 0) #define PCIE_CLIENT_GEN_SEL_2 HIWORD_UPDATE_BIT(0x0080) #define PCIE_CLIENT_SIDE_BAND_STATUS (PCIE_CLIENT_BASE + 0x20) +#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) #define PCIE_CLIENT_DEBUG_LTSSM_MASK GENMASK(5, 0)
On 2/14/23 23:08, Rick Wertenbroek wrote:
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.
Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller") Cc: stable@vger.kernel.org Signed-off-by: Rick Wertenbroek rick.wertenbroek@gmail.com
Some nits below. But otherwise works fine for me.
drivers/pci/controller/pcie-rockchip-ep.c | 38 +++++------------------ drivers/pci/controller/pcie-rockchip.h | 6 ++++ 2 files changed, 14 insertions(+), 30 deletions(-)
diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c index cbc281a6a..ca5b363ba 100644 --- a/drivers/pci/controller/pcie-rockchip-ep.c +++ b/drivers/pci/controller/pcie-rockchip-ep.c @@ -328,45 +328,23 @@ static void rockchip_pcie_ep_assert_intx(struct rockchip_pcie_ep *ep, u8 fn, u8 intx, bool is_asserted) { 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) { ep->irq_pending |= BIT(intx);
msg_code = ROCKCHIP_PCIE_MSG_CODE_ASSERT_INTA + intx;msg_code = ROCKCHIP_PCIE_MSG_CODE_DEASSERT_INTA + intx;
- 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);
- if (is_asserted) {
rockchip_pcie_write(rockchip,PCIE_CLIENT_INT_IN_ASSERT | PCIE_CLIENT_INT_PEND_ST_PEND,PCIE_CLIENT_LEGACY_INT_CTRL);- } else {
rockchip_pcie_write(rockchip,PCIE_CLIENT_INT_IN_DEASSERT | PCIE_CLIENT_INT_PEND_ST_NORMAL,PCIE_CLIENT_LEGACY_INT_CTRL);
With this change, you have now twice "if (is_asserted) {", which is not necessary. You can simplify the code a bit:
static void rockchip_pcie_ep_assert_intx(struct rockchip_pcie_ep *ep, u8 fn, u8 intx, bool do_assert) {
u8 msg_code;
intx &= 3;
if (do_assert) {
ep->irq_pending |= BIT(intx);
msg_code = ROCKCHIP_PCIE_MSG_CODE_ASSERT_INTA + intx;
rockchip_pcie_write(&ep->rockchip,
PCIE_CLIENT_INT_IN_ASSERT |
PCIE_CLIENT_INT_PEND_ST_PEND,
PCIE_CLIENT_LEGACY_INT_CTRL);
return;
}
ep->irq_pending &= ~BIT(intx);
msg_code = ROCKCHIP_PCIE_MSG_CODE_DEASSERT_INTA + intx;
rockchip_pcie_write(&ep->rockchip,
PCIE_CLIENT_INT_IN_DEASSERT |
PCIE_CLIENT_INT_PEND_ST_NORMAL,
PCIE_CLIENT_LEGACY_INT_CTRL);
}
Note also the renaming of the argument "is_asserted" to "do_assert". The name is_asserted is badly misleading considering the english meaning given that it is true when we *must* do the assert and false when we must deassert. So do_assert as a name better match the use of that argument I think.
- 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, diff --git a/drivers/pci/controller/pcie-rockchip.h b/drivers/pci/controller/pcie-rockchip.h index 72e427a0f..e90c2a2b8 100644 --- a/drivers/pci/controller/pcie-rockchip.h +++ b/drivers/pci/controller/pcie-rockchip.h @@ -39,6 +39,12 @@ #define PCIE_CLIENT_GEN_SEL_1 HIWORD_UPDATE(0x0080, 0) #define PCIE_CLIENT_GEN_SEL_2 HIWORD_UPDATE_BIT(0x0080) #define PCIE_CLIENT_SIDE_BAND_STATUS (PCIE_CLIENT_BASE + 0x20) +#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) #define PCIE_CLIENT_DEBUG_LTSSM_MASK GENMASK(5, 0)
On 2/14/23 23:08, Rick Wertenbroek wrote:
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.
Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller") Cc: stable@vger.kernel.org Signed-off-by: Rick Wertenbroek rick.wertenbroek@gmail.com
drivers/pci/controller/pcie-rockchip-ep.c | 38 +++++------------------ drivers/pci/controller/pcie-rockchip.h | 6 ++++ 2 files changed, 14 insertions(+), 30 deletions(-)
diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c index cbc281a6a..ca5b363ba 100644 --- a/drivers/pci/controller/pcie-rockchip-ep.c +++ b/drivers/pci/controller/pcie-rockchip-ep.c @@ -328,45 +328,23 @@ static void rockchip_pcie_ep_assert_intx(struct rockchip_pcie_ep *ep, u8 fn, u8 intx, bool is_asserted) { 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;
By the way, ROCKCHIP_PCIE_EP_PCI_LEGACY_IRQ_ADDR is now unused. Remove it too please.
linux-stable-mirror@lists.linaro.org
-
Damien Le Moal -
Rick Wertenbroek