imx6_pcie_link_up() previously used usleep_range() to wait for the link to
come up.  Since it may be called while holding the config spinlock, the
sleep causes a "BUG: scheduling while atomic" error.

Instead of waiting for the link to come up in imx6_pcie_link_up(), do the
waiting in imx6_pcie_wait_for_link(), where we're not holding a lock and
sleeping is allowed.

[bhelgaas: changelog, references to bugzilla and f95d3ae7]
Link: https://bugzilla.kernel.org/show_bug.cgi?id=100031
Fixes: f95d3ae7 ("PCI: imx6: Wait for retraining")
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

Remove the remnants of the workaround for erratum ERR005184 which was never
completely implemented.  The checks alone don't carry any value as we don't
act properly on the result.

A workaround should be added to the lane speed change in establish_link
later.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

This adds the PHY reset into a common error path of
imx6_pcie_establish_link(), deduplicating some of the debug prints.  Also
reduce the severity of the "no-link" message in the one place where it is
expected to be hit when no peripheral is attached.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

Move imx6_pcie_reset_phy() near the other PHY related functions in the
file.  This is a cosmetic change, but also allows to do the following
changes without introducing needless forward declarations.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

Fix all whitespace issues (missing or needed whitespace) in all files in
drivers/pci.  Code is compiled with allyesconfig before and after code
changes and objects are recorded and checked with objdiff and they are not
changed after this commit.
Signed-off-by: NBogicevic Sasa <brutallesale@gmail.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

On -RT and if kernel is booting with "threadirqs" cmd line parameter,
PCIe/PCI (MSI) IRQ cascade handlers (like dra7xx_pcie_msi_irq_handler())
will be forced threaded and, as result, will generate warnings like this:

  WARNING: CPU: 1 PID: 82 at kernel/irq/handle.c:150 handle_irq_event_percpu+0x14c/0x174()
  irq 460 handler irq_default_primary_handler+0x0/0x14 enabled interrupts
  Backtrace:
   (warn_slowpath_common) from (warn_slowpath_fmt+0x38/0x40)
   (warn_slowpath_fmt) from (handle_irq_event_percpu+0x14c/0x174)
   (handle_irq_event_percpu) from (handle_irq_event+0x84/0xb8)
   (handle_irq_event) from (handle_simple_irq+0x90/0x118)
   (handle_simple_irq) from (generic_handle_irq+0x30/0x44)
   (generic_handle_irq) from (dra7xx_pcie_msi_irq_handler+0x7c/0x8c)
   (dra7xx_pcie_msi_irq_handler) from (irq_forced_thread_fn+0x28/0x5c)
   (irq_forced_thread_fn) from (irq_thread+0x128/0x204)

This happens because all of them invoke generic_handle_irq() from the
requested handler.  generic_handle_irq() grabs raw_locks and thus needs to
run in raw-IRQ context.

This issue was originally reproduced on TI dra7-evem, but, as was
identified during discussion [1], other hosts can also suffer from this
issue.  Fix all them at once by marking PCIe/PCI (MSI) IRQ cascade handlers
IRQF_NO_THREAD explicitly.

[1] http://lkml.kernel.org/r/1448027966-21610-1-git-send-email-grygorii.strashko@ti.com

[bhelgaas: add stable tag, fix typos]
Signed-off-by: NGrygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: Lucas Stach <l.stach@pengutronix.de> (for imx6)
CC: stable@vger.kernel.org
CC: Kishon Vijay Abraham I <kishon@ti.com>
CC: Jingoo Han <jingoohan1@gmail.com>
CC: Kukjin Kim <kgene@kernel.org>
CC: Krzysztof Kozlowski <k.kozlowski@samsung.com>
CC: Richard Zhu <Richard.Zhu@freescale.com>
CC: Thierry Reding <thierry.reding@gmail.com>
CC: Stephen Warren <swarren@wwwdotorg.org>
CC: Alexandre Courbot <gnurou@gmail.com>
CC: Simon Horman <horms@verge.net.au>
CC: Pratyush Anand <pratyush.anand@gmail.com>
CC: Michal Simek <michal.simek@xilinx.com>
CC: "Sören Brinkmann" <soren.brinkmann@xilinx.com>
CC: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We previously used of_get_named_gpio(), which ignores the OF flags cell, so
the reset GPIO defaulted to "active high." This doesn't work on the Toradex
Apalis SoM with Ixora base board, which has an active-low reset GPIO.

Use devm_gpiod_get_optional() instead so we pay attention to the active
high/low flag.  This also adds support for GPIOs described via ACPI.

[bhelgaas: changelog]
Signed-off-by: NPetr Štetiar <ynezz@true.cz>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NLucas Stach <l.stach@pengutronix.de>

We are in a context where we can sleep, and the PCIe reset gpio may be on
an I2C expander.  Use the cansleep() variant when setting the GPIO value.

Based on a patch from Russell King for pci-mvebu.c.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NLucas Stach <l.stach@pengutronix.de>

Add a #define for PCIE_PHY_RX_ASIC_OUT_VALID and use it instead of a
hardcoded value.

[bhelgaas: drop PCIE_PHY_DEBUG_R0_LTSSM_MASK; updated in future patch]
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NBjorn Helgaas <helgaas@kernel.org>
Reviewed-by: NLucas Stach <l.stach@pengutronix.de>

When devm_request_irq() fails, imx6_add_pcie_port() should return the real
error code instead of always returning -ENODEV.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NBjorn Helgaas <helgaas@kernel.org>
Reviewed-by: NLucas Stach <l.stach@pengutronix.de>

Simplify a trivial if-return sequence by combining it with a preceding
function call.

The semantic patch that makes this change is available in
scripts/coccinelle/misc/simple_return.cocci.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
CC: Lucas Stach <l.stach@pengutronix.de>

Define PCIE_RC_LCSR and use it instead of the bare offset "0x80."
No functional change.
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

Use "u32", not "uint32_t", for consistency.  Use "tmp", not "temp", for
consistency within the driver.
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NRichard Zhu <Richard.Zhu@freescale.com>

Currently, the timeout is never detected as count has a value of -1 if a
timeout happens, but the code is checking for 0.  Also, this patch removes
the unneeded final wait if a timeout occurs.

[bhelgaas: reworked starting from http://lkml.kernel.org/r/1433543864-7252-1-git-send-email-troy.kisky@boundarydevices.com]
Signed-off-by: NTroy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

All the DesignWare-based host drivers loop waiting for the link to come up,
but they do it several ways that are needlessly different.

Wait for the link to come up in a consistent style across all the
DesignWare drivers.  No functional change.
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NPratyush Anand <pratyush.anand@gmail.com>

Rename imx6_pcie_start_link() to imx6_pcie_establish_link() to follow the
convention of other DesignWare-based host drivers.  No functional change.
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NPratyush Anand <pratyush.anand@gmail.com>

This patch fixes the following checkpatch error:

  ERROR: code indent should use tabs where possible
Signed-off-by: NJingoo Han <jg1.han@samsung.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

For boards without a reset GPIO we skip the delay between enabling the
pcie_ref_clk and touching the RC registers for configuration.  This hangs
the system if there isn't a proper delay to ensure the clocks are settled
in the DW PCIe core.

Also iMX6Q always needs an additional 10us delay to make sure the reset is
propagated through the core, as we don't have an explicitly controlled
reset input on this SoC.

This fixes a problem with 3fce0e88 ("PCI: imx6: Delay enabling
reference clock for SS until it stabilizes"): the kernel doesn't boot on
systems that don't pass the PCI GPIO reset in the DTB.  This regression
affects mx6 nitrogen boards.

[bhelgaas: add regression info in changelog]
Fixes: 3fce0e88 ("PCI: imx6: Delay enabling reference clock for SS until it stabilizes")
Reported-by: NFabio Estevam <fabio.estevam@freescale.com>
Tested-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NRichard Zhu <richard.zhu@freescale.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NLucas Stach <l.stach@pengutronix.de>

A platform_driver does not need to set an owner, it will be populated by the
driver core.
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

According to the IMX6 reference manuals, REF_SSP_EN (Reference clock enable
for SS function) must remain deasserted until the reference clock is
running at the appropriate frequency.

Delay enabling the reference clock for the SS function until it has
stabilized.  This prevents a high link failure rate (>5%) on certain IMX6
boards at various temperatures.

[bhelgaas: reword changelog slightly]
Tested-by: NFabio Estevam <festevam@gmail.com>
Signed-off-by: NTim Harvey <tharvey@gateworks.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NMarek Vasut <marex@denx.de>
Acked-by: NLucas Stach <l.stach@pengutronix.de>

This effectively reverts f216f57f ("PCI: imx6: Probe the PCIe in
fs_initcall()") as the resource allocation issue that prevented the driver
from working properly at module_initcall level is now fixed in
pcie-designware.c.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NRichard Zhu <r65037@freescale.com>

This fixes a boot hang observed when the bootloader already enabled the
PCIe link for its own use.  The fundamental problem is that Freescale
forgot to wire up the core reset, so software doesn't have a sane way to
get the core into a defined state.

According to the DW PCIe core reference manual, configuration of the core
may only happen when the LTSSM is disabled, so this is one of the first
things we need to do.  Apparently this isn't safe to do when the LTSSM is in
any state other than "detect" as we observe an instant machine hang when
trying to do so while the link is already up.

As a workaround, force LTSSM into detect state right before hitting the
disable switch.  There is still a race window because the LTSSM may
transition out of "detect" before we can disable it, but it's the best
we can do for now.

[bhelgaas: mention race window]
Link: http://lkml.kernel.org/r/1406830565-23450-3-git-send-email-l.stach@pengutronix.deReported-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NTim Harvey <tharvey@gateworks.com>

This patch adds support for Message Signaled Interrupts in the imx6-pcie
driver.
Signed-off-by: NHarro Haan <hrhaan@gmail.com>
Signed-off-by: NJuergen Beisert <jbe@pengutronix.de>
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NRichard Zhu <r65037@freescale.com>

They are dropped with the new binding.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NRichard Zhu <r65037@freescale.com>

We don't need this anymore.  The IRQs are now properly mapped through the
DT.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NRichard Zhu <r65037@freescale.com>

As defined in the new binding.
Signed-off-by: NLucas Stach <l.stach@pengutronix.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NRichard Zhu <r65037@freescale.com>

imx6_add_pcie_port() is called only from from imx6_pcie_probe() which is
annotated with __init.  Thus it makes sense to annotate
imx6_add_pcie_port() with __init to avoid section mismatch warnings.

[bhelgaas: changelog]
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Cc: Sean Cross <xobs@kosagi.com>

Serialization of configuration accesses is provided by 'pci_lock' in
drivers/pci/access.c thus making the driver's 'conf_lock' superfluous.
Signed-off-by: NAndrew Murray <amurray@embedded-bits.co.uk>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NJingoo Han <jg1.han@samsung.com>
Acked-by: NRichard Zhu <r65037@freescale.com>

This patch handles the case where the PCIe link is up and running, yet
drops into the LTSSM training mode. The link spends short time in the LTSSM
training mode, but the current code can misinterpret it as the link being
stalled.  Waiting for the LTSSM training to complete fixes the issue.

Quoting Sascha:

  This is broken since commit 7f9f40c0 ('PCI: imx6: Report "link up"
  only after link training completes').

  The designware driver changes the PORT_LOGIC_SPEED_CHANGE bit in
  dw_pcie_host_init() which causes the link to be retrained. During the
  next call to dw_pcie_rd_conf() the link is then reported being down and
  the function returns PCIBIOS_DEVICE_NOT_FOUND resulting in nonfunctioning
  PCIe.

Fixes: 7f9f40c0 (PCI: imx6: Report "link up" only after link training completes)
Tested-by: NTroy Kisky <troy.kisky@boundarydevices.com>
Tested-by: NSascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NTroy Kisky <troy.kisky@boundarydevices.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>

LTSSM shouldn't be set once in assert_core_reset().  Move peripheral reset
just before LTSSM start.
Signed-off-by: NRichard Zhu <r65037@freescale.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Cc: Frank Li <lznuaa@gmail.com>
Cc: Harro Haan <hrhaan@gmail.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Richard Zhu <r65037@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Sean Cross <xobs@kosagi.com>
Cc: Siva Reddy Kallam <siva.kallam@samsung.com>
Cc: Srikanth T Shivanand <ts.srikanth@samsung.com>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: Yinghai Lu <yinghai@kernel.org>

This patch first forces the link into Gen1 mode before starting up the link
and, only after the link is up, start negotiating possible Gen2 mode
operation.  This is because without such sequence, some PCIe switches are
not detected at all.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Cc: Frank Li <lznuaa@gmail.com>
Cc: Harro Haan <hrhaan@gmail.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Richard Zhu <r65037@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Sean Cross <xobs@kosagi.com>
Cc: Siva Reddy Kallam <siva.kallam@samsung.com>
Cc: Srikanth T Shivanand <ts.srikanth@samsung.com>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: Yinghai Lu <yinghai@kernel.org>

Split the function that waits for the PCIe link to come up from the rest if
the host init function.  We will find this change useful in the subsequent
patch, since this will be called twice then.

No functional change.

[bhelgaas: remove useless "return;"]
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Cc: Frank Li <lznuaa@gmail.com>
Cc: Harro Haan <hrhaan@gmail.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Richard Zhu <r65037@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Sean Cross <xobs@kosagi.com>
Cc: Siva Reddy Kallam <siva.kallam@samsung.com>
Cc: Srikanth T Shivanand <ts.srikanth@samsung.com>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: Yinghai Lu <yinghai@kernel.org>

Split the PCIe PHY reset from the link up function to make the code a
little more structured.

No functional change.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Cc: Frank Li <lznuaa@gmail.com>
Cc: Harro Haan <hrhaan@gmail.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Richard Zhu <r65037@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Sean Cross <xobs@kosagi.com>
Cc: Siva Reddy Kallam <siva.kallam@samsung.com>
Cc: Srikanth T Shivanand <ts.srikanth@samsung.com>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: Yinghai Lu <yinghai@kernel.org>

While waiting for the PHY to report the PCIe link is up, we might hit a
situation where the link training is still in progress, while the PHY
already reports the link is up.  Add additional check for this condition.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Cc: Frank Li <lznuaa@gmail.com>
Cc: Harro Haan <hrhaan@gmail.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Richard Zhu <r65037@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Sean Cross <xobs@kosagi.com>
Cc: Siva Reddy Kallam <siva.kallam@samsung.com>
Cc: Srikanth T Shivanand <ts.srikanth@samsung.com>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: Yinghai Lu <yinghai@kernel.org>

Some boards do not have a PCIe reset GPIO.  To avoid probe failure on these
boards, make the reset GPIO optional as well.

[bhelgaas: whitespace fixes]
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Reviewed-by: NJingoo Han <jg1.han@samsung.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Cc: Frank Li <lznuaa@gmail.com>
Cc: Harro Haan <hrhaan@gmail.com>
Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Richard Zhu <r65037@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Sean Cross <xobs@kosagi.com>
Cc: Siva Reddy Kallam <siva.kallam@samsung.com>
Cc: Srikanth T Shivanand <ts.srikanth@samsung.com>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: Yinghai Lu <yinghai@kernel.org>

There is no need to use 'goto err' as we can directly return the errors.
No functional change.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>

When using devm_ioremap_resource(), we do not need to check the return
value of platform_get_resource(), so just remove it.
Signed-off-by: NFabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NMarek Vasut <marex@denx.de>

Probe the PCIe driver in fs_initcall() instead of module_init()
to assure that pci_assign_unassigned_resources() will be called
early.  This function is called in dw_pcie_host_init(), which is
in turn called from imx6_add_pcie_port(), which is called from
imx6_pcie_probe().  If this is not called early, we will hit
resource collisions since pcieport driver is then probed way too
late.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Cc: Frank Li <lznuaa@gmail.com>
Cc: Jingoo Han <jg1.han@samsung.com>
Cc: Mohit KUMAR <Mohit.KUMAR@st.com>
Cc: Pratyush Anand <pratyush.anand@st.com>
Cc: Richard Zhu <r65037@freescale.com>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Sean Cross <xobs@kosagi.com>
Cc: Siva Reddy Kallam <siva.kallam@samsung.com>
Cc: Srikanth T Shivanand <ts.srikanth@samsung.com>
Cc: Tim Harvey <tharvey@gateworks.com>
Cc: Troy Kisky <troy.kisky@boundarydevices.com>
Cc: Yinghai Lu <yinghai@kernel.org>

imx6_pcie_of_match is always compiled in because PCI_IMX6 depends on
SOC_IMX6Q, which only supports OF build.  Hence of_match_ptr is not
required.

[bhelgaas: add changelog details from Shawn]
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>
Cc: Sean Cross <xobs@kosagi.com>

A longer link startup timeout is required when certain PCI switches are
attached to the root complex.  This was tested with a Pericom switch
and a PLX switch.
Signed-off-by: NMarek Vasut <marex@denx.de>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Acked-by: NTim Harvey <tharvey@gateworks.com>
Acked-by: NShawn Guo <shawn.guo@linaro.org>