From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?UTF-8?B?IkRhdmlkIE3DvGxsZXIgKEVMU09GVCBBRyki?= <d.mueller@elsoft.ch>
Date: Fri, 30 May 2014 09:04:50 +0200
Subject: [U-Boot] U-boot hangs on imx6 pci driver
In-Reply-To: <CAOMZO5AaqOjnJ1ncZb09QfUg2eBPwhDi8wMiipVTtK45X_kKWA@mail.gmail.com>
References: <CAOMZO5DU_AbK59WuU8kypC4aoq0KmCN9wa7oFMOHRyXaNEUWOQ@mail.gmail.com>	<201405271525.51525.marex@denx.de>	<5384A47C.7010107@elsoft.ch>	<201405271656.31939.marex@denx.de>	<53859308.3020006@elsoft.ch>
	<CAOMZO5AaqOjnJ1ncZb09QfUg2eBPwhDi8wMiipVTtK45X_kKWA@mail.gmail.com>
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Fabio Estevam wrote:
> On Wed, May 28, 2014 at 4:40 AM, "David M?ller (ELSOFT AG)"
> <d.mueller@elsoft.ch> wrote:
>> I use an additional delay in imx6_add_pcie_port() as a workaround so far.
> 
> How much of additional delay? Could you please share your patch?

diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index ee08250..1accc0e 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -503,6 +532,9 @@ static int imx6_add_pcie_port(struct pcie_port *pp,
 	pp->root_bus_nr = -1;
 	pp->ops = &imx6_pcie_host_ops;

+	/* FIXME  kernel hangs without this delay */
+	usleep_range(20000, 25000);
+
 	spin_lock_init(&pp->conf_lock);
 	ret = dw_pcie_host_init(pp);
 	if (ret) {


Dave