apalis_t30: fix pcie clock and reset not conforming to specification

Fix PCIe clock and reset not conforming to specification by moving PCIe
reset handling including the PLX PEX 8605 errata 5 workaround from the
board platform data into the right places timing wise in the PCIe driver
itself.

Also add a kernel command line argument to allow using the Apalis GPIO7
as a regular GPIO rather than for above mentioned PLX PEX 8605
workaround:

pex_perst=0

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>
Acked-by: Max Krummenacher <max.krummenacher@toradex.com>

1 files changed, 0 insertions, 14 deletions

diff --git a/arch/arm/mach-tegra/board-apalis_t30.c b/arch/arm/mach-tegra/board-apalis_t30.c
index 4715676a877b..1142a84de7b0 100644
--- a/arch/arm/mach-tegra/board-apalis_t30.c
+++ b/arch/arm/mach-tegra/board-apalis_t30.c
@@ -830,20 +830,6 @@ static struct tegra_pci_platform_data apalis_t30_pci_platform_data = {
 
 static void apalis_t30_pci_init(void)
 {
-	/* Reset PLX PEX 8605 PCIe Switch plus PCIe devices on Apalis Evaluation
-	   Board */
-	gpio_request(PEX_PERST_N, "PEX_PERST_N");
-	gpio_request(RESET_MOCI_N, "RESET_MOCI_N");
-	gpio_direction_output(PEX_PERST_N, 0);
-	gpio_direction_output(RESET_MOCI_N, 0);
-	/* Must be asserted for 100 ms after power and clocks are stable */
-	msleep(100);
-	gpio_set_value(PEX_PERST_N, 1);
-	/* Err_5: PEX_REFCLK_OUTpx/nx Clock Outputs is not Guaranteed Until
-	   900 us After PEX_PERST# De-assertion */
-	mdelay(1);
-	gpio_set_value(RESET_MOCI_N, 1);
-
 	tegra_pci_device.dev.platform_data = &apalis_t30_pci_platform_data;
 	platform_device_register(&tegra_pci_device);
 }