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76 lines
2.8 KiB
Diff
76 lines
2.8 KiB
Diff
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From 871d0b3de72f8af11a41696a375972a38b408ec9 Mon Sep 17 00:00:00 2001
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From: Phil Elwell <phil@raspberrypi.com>
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Date: Thu, 11 Jun 2020 09:57:03 +0100
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Subject: [PATCH 0215/1085] PCI: brcmstb: Add DT property to control L1SS
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The BRCM PCIe block has controls to enable control of the CLKREQ#
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signal by the L1SS, and to gate the refclk with the CLKREQ# input.
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These controls are mutually exclusive - the upstream code sets the
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latter, but some use cases require the former.
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Add a Device Tree property - brcm,enable-l1ss - to switch to the
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L1SS configuration.
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Signed-off-by: Phil Elwell <phil@raspberrypi.com>
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---
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drivers/pci/controller/pcie-brcmstb.c | 26 +++++++++++++++++++++-----
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1 file changed, 21 insertions(+), 5 deletions(-)
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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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@@ -123,6 +123,7 @@
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#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK 0x2
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#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x08000000
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#define PCIE_BMIPS_MISC_HARD_PCIE_HARD_DEBUG_SERDES_IDDQ_MASK 0x00800000
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+#define PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_L1SS_ENABLE_MASK 0x00200000
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#define PCIE_INTR2_CPU_BASE 0x4300
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@@ -252,6 +253,7 @@ struct brcm_pcie {
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struct clk *clk;
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struct device_node *np;
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bool ssc;
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+ bool l1ss;
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int gen;
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u64 msi_target_addr;
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struct brcm_msi *msi;
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@@ -1077,12 +1079,25 @@ static int brcm_pcie_start_link(struct b
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pci_speed_string(pcie_link_speed[cls]), nlw,
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ssc_good ? "(SSC)" : "(!SSC)");
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- /*
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- * Refclk from RC should be gated with CLKREQ# input when ASPM L0s,L1
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- * is enabled => setting the CLKREQ_DEBUG_ENABLE field to 1.
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- */
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tmp = readl(base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
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- tmp |= PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK;
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+ if (pcie->l1ss) {
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+ /*
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+ * Enable CLKREQ# signalling include L1 Substate control of
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+ * the CLKREQ# signal and the external reference clock buffer.
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+ * meet requirement for Endpoints that require CLKREQ#
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+ * assertion to clock active within 400ns.
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+ */
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+ tmp &= ~PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK;
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+ tmp |= PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_L1SS_ENABLE_MASK;
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+ } else {
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+ /*
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+ * Refclk from RC should be gated with CLKREQ# input when
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+ * ASPM L0s,L1 is enabled => setting the CLKREQ_DEBUG_ENABLE
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+ * field to 1.
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+ */
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+ tmp &= ~PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_L1SS_ENABLE_MASK;
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+ tmp |= PCIE_MISC_HARD_PCIE_HARD_DEBUG_CLKREQ_DEBUG_ENABLE_MASK;
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+ }
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writel(tmp, base + PCIE_MISC_HARD_PCIE_HARD_DEBUG);
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return 0;
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@@ -1536,6 +1551,7 @@ static int brcm_pcie_probe(struct platfo
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pcie->gen = (ret < 0) ? 0 : ret;
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pcie->ssc = of_property_read_bool(np, "brcm,enable-ssc");
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+ pcie->l1ss = of_property_read_bool(np, "brcm,enable-l1ss");
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ret = clk_prepare_enable(pcie->clk);
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if (ret) {
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