diff options
Diffstat (limited to 'target/linux/mvebu/patches-5.4/001-PCI-aardvark-Wait-for-endpoint-to-be-ready-before-tr.patch')
-rw-r--r-- | target/linux/mvebu/patches-5.4/001-PCI-aardvark-Wait-for-endpoint-to-be-ready-before-tr.patch | 50 |
1 files changed, 0 insertions, 50 deletions
diff --git a/target/linux/mvebu/patches-5.4/001-PCI-aardvark-Wait-for-endpoint-to-be-ready-before-tr.patch b/target/linux/mvebu/patches-5.4/001-PCI-aardvark-Wait-for-endpoint-to-be-ready-before-tr.patch deleted file mode 100644 index ca10ecf6b2..0000000000 --- a/target/linux/mvebu/patches-5.4/001-PCI-aardvark-Wait-for-endpoint-to-be-ready-before-tr.patch +++ /dev/null @@ -1,50 +0,0 @@ -From f4c7d053d7f77cd5c1a1ba7c7ce085ddba13d1d7 Mon Sep 17 00:00:00 2001 -From: Remi Pommarel <repk@triplefau.lt> -Date: Wed, 22 May 2019 23:33:50 +0200 -Subject: [PATCH] PCI: aardvark: Wait for endpoint to be ready before training - link - -When configuring pcie reset pin from gpio (e.g. initially set by -u-boot) to pcie function this pin goes low for a brief moment -asserting the PERST# signal. Thus connected device enters fundamental -reset process and link configuration can only begin after a minimal -100ms delay (see [1]). - -Because the pin configuration comes from the "default" pinctrl it is -implicitly configured before the probe callback is called: - -driver_probe_device() - really_probe() - ... - pinctrl_bind_pins() /* Here pin goes from gpio to PCIE reset - function and PERST# is asserted */ - ... - drv->probe() - -[1] "PCI Express Base Specification", REV. 4.0 - PCI Express, February 19 2014, 6.6.1 Conventional Reset - -Signed-off-by: Remi Pommarel <repk@triplefau.lt> -Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> -Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com> ---- - drivers/pci/controller/pci-aardvark.c | 8 ++++++++ - 1 file changed, 8 insertions(+) - ---- a/drivers/pci/controller/pci-aardvark.c -+++ b/drivers/pci/controller/pci-aardvark.c -@@ -353,6 +353,14 @@ static void advk_pcie_setup_hw(struct ad - reg |= PIO_CTRL_ADDR_WIN_DISABLE; - advk_writel(pcie, reg, PIO_CTRL); - -+ /* -+ * PERST# signal could have been asserted by pinctrl subsystem before -+ * probe() callback has been called, making the endpoint going into -+ * fundamental reset. As required by PCI Express spec a delay for at -+ * least 100ms after such a reset before link training is needed. -+ */ -+ msleep(PCI_PM_D3COLD_WAIT); -+ - /* Start link training */ - reg = advk_readl(pcie, PCIE_CORE_LINK_CTRL_STAT_REG); - reg |= PCIE_CORE_LINK_TRAINING; |