aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-4.19/950-0804-pcie-brcmstb-Bounce-buffer-support-is-for-BCM2711B0.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0804-pcie-brcmstb-Bounce-buffer-support-is-for-BCM2711B0.patch')
-rw-r--r--target/linux/brcm2708/patches-4.19/950-0804-pcie-brcmstb-Bounce-buffer-support-is-for-BCM2711B0.patch88
1 files changed, 88 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0804-pcie-brcmstb-Bounce-buffer-support-is-for-BCM2711B0.patch b/target/linux/brcm2708/patches-4.19/950-0804-pcie-brcmstb-Bounce-buffer-support-is-for-BCM2711B0.patch
new file mode 100644
index 0000000000..05172ebcec
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.19/950-0804-pcie-brcmstb-Bounce-buffer-support-is-for-BCM2711B0.patch
@@ -0,0 +1,88 @@
+From 4b777f389e22abb364e398f45673e54bcda9cc55 Mon Sep 17 00:00:00 2001
+From: Phil Elwell <phil@raspberrypi.org>
+Date: Fri, 12 Jul 2019 11:41:25 +0100
+Subject: [PATCH] pcie-brcmstb: Bounce buffer support is for BCM2711B0
+
+Add a new compatible string to identify BCM2711B0, as later revisions
+don't require the bounce buffer support.
+
+Signed-off-by: Phil Elwell <phil@raspberrypi.org>
+---
+ drivers/pci/controller/pcie-brcmstb.c | 31 +++++++++++++++++++++++----
+ 1 file changed, 27 insertions(+), 4 deletions(-)
+
+--- a/drivers/pci/controller/pcie-brcmstb.c
++++ b/drivers/pci/controller/pcie-brcmstb.c
+@@ -206,6 +206,8 @@ enum pcie_type {
+ BCM7435,
+ GENERIC,
+ BCM7278,
++ BCM2711B0,
++ BCM2711,
+ };
+
+ struct brcm_window {
+@@ -302,6 +304,20 @@ static const int pcie_offsets[] = {
+ [EXT_CFG_DATA] = 0x8000,
+ };
+
++static const struct pcie_cfg_data bcm2711b0_cfg = {
++ .reg_field_info = pcie_reg_field_info,
++ .offsets = pcie_offsets,
++ .max_burst_size = BURST_SIZE_128,
++ .type = BCM2711B0,
++};
++
++static const struct pcie_cfg_data bcm2711_cfg = {
++ .reg_field_info = pcie_reg_field_info,
++ .offsets = pcie_offsets,
++ .max_burst_size = BURST_SIZE_128,
++ .type = BCM2711,
++};
++
+ static const struct pcie_cfg_data bcm7435_cfg = {
+ .reg_field_info = pcie_reg_field_info,
+ .offsets = pcie_offsets,
+@@ -312,7 +328,7 @@ static const struct pcie_cfg_data bcm743
+ static const struct pcie_cfg_data generic_cfg = {
+ .reg_field_info = pcie_reg_field_info,
+ .offsets = pcie_offsets,
+- .max_burst_size = BURST_SIZE_128, // before BURST_SIZE_512
++ .max_burst_size = BURST_SIZE_512,
+ .type = GENERIC,
+ };
+
+@@ -380,7 +396,7 @@ static unsigned int bounce_buffer = 32*1
+ module_param(bounce_buffer, uint, 0644);
+ MODULE_PARM_DESC(bounce_buffer, "Size of bounce buffer");
+
+-static unsigned int bounce_threshold = 0xc0000000;
++static unsigned int bounce_threshold;
+ module_param(bounce_threshold, uint, 0644);
+ MODULE_PARM_DESC(bounce_threshold, "Bounce threshold");
+
+@@ -1681,6 +1697,8 @@ static int brcm_pcie_remove(struct platf
+ }
+
+ static const struct of_device_id brcm_pcie_match[] = {
++ { .compatible = "brcm,bcm2711b0-pcie", .data = &bcm2711b0_cfg },
++ { .compatible = "brcm,bcm2711-pcie", .data = &bcm2711_cfg },
+ { .compatible = "brcm,bcm7425-pcie", .data = &bcm7425_cfg },
+ { .compatible = "brcm,bcm7435-pcie", .data = &bcm7435_cfg },
+ { .compatible = "brcm,bcm7278-pcie", .data = &bcm7278_cfg },
+@@ -1736,8 +1754,13 @@ static int brcm_pcie_probe(struct platfo
+ if (IS_ERR(base))
+ return PTR_ERR(base);
+
+- /* To Do: Add hardware check if this ever gets fixed */
+- if (max_pfn > (bounce_threshold/PAGE_SIZE)) {
++ if (!bounce_threshold) {
++ /* PCIe on BCM2711B0 can only address 3GB */
++ if (pcie->type == BCM2711B0 || pcie->type == GENERIC)
++ bounce_threshold = 0xc0000000;
++ }
++
++ if (bounce_threshold && (max_pfn > (bounce_threshold/PAGE_SIZE))) {
+ int ret;
+ ret = brcm_pcie_bounce_init(&pdev->dev, bounce_buffer,
+ (dma_addr_t)bounce_threshold);