video: fb: xylonfb: Refresh rate bug fix

Fixed bug in calculation of display refresh rate when working in no EDID mode.
Added usage of VESA timings with reduced blanking period when getting video
mode timing parameters from kernel.

Signed-off-by: Davor Joja <davor.joja@logicbricks.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
drivers: staging: Client driver for AXI VDMA engine.

Provides handle to user-space application to configures
xilinx axi-vdma driver.
Uses DMA Engine API to perform functions like DMA channel
allocation,configuration and device control.

Signed-off-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
drivers: staging: imageon configures ADV7611 chip

Imageon driver provides platform data for initializing ADV7611
hdmi-in chip.
It configures ADV7611 using V4L2 sub-dev kernel API.
Uses request_firmware API to read EDID from fileystem.
Configured as loadable module and inserted into kernel
when filesystem and mdev(userspace handler) is up.

Signed-off-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
arm : dts : Zynq Base TRD dts added

Added additional parameters required for Zynq Base TRD.
Built on top of zynq-zc702 dts.
a)I2c entries added for ADV7511 ,IPMI eeprom and
some entries related to i2c slaves on FMC card .
b)UIO entries for Video IP's .
c)Xylon framebuffer.

Signed-off-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
arm: configs: Zynq Base TRD defconfig added

Enables Staging.
Selects AXI-VDMA client driver.
Selects imageon driver for ADV7611.

Signed-off-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
xilinx_emacps: Fix locking issues

The existing driver has locking issues. This patch fixes them.
The locking issues/warnings are mainly because some of the routines
are trying to acquire tx and rx locks both. Acquiring of both locks
was implemented because net_ctrl register was getting accessed on
both tx and rx paths and also in the timer handler meant to provide
a workaround for the Rx path sillicon issue. To maintain a consistent
net_ctrl register, some of the routines had to acquire both locks.
To fix this, this patch provides one more lock that is used only for
the net_ctrl register. This provides a much cleaner locking mechanism.
Also, after much analysis it was figured out that, some of the APIs
(e.g. xemacps_close and ethtool APIs) do not need any locks.
Some of the locking related warnings were because of these APIs
acquiring both the locks. This patch addresses them.

Signed-off-by: Anirudha Sarangi <anirudh@xilinx.com>
Tested-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
xilinx_emacps: Fix handling of skb fragments (1/3)

xemacps_clean_rings() needs to know the fragment length for unmapping
a Tx skb fragment -- skb->len is only correct for the first fragment.

For this, we add a field 'len' to 'struct ring_info'. We employ this
field for Rx packets as well, if only to avoid using the constant
XEMACPS_RX_BUF_SIZE everywhere.

Note: We also fix a minor issue with the tx_bytes statistics counter in
xemacps_tx_poll(); it was found when dropping the 'leninbd' variable
(which is no longer needed).

Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com>
Tested-by: Anirudha Sarangi <anirudh@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
xilinx_emacps: Fix handling of skb fragments (2/3)

In xemacps_start_xmit(), we cannot set tx_skb[].skb = NULL for a
fragment because xemacps_clean_rings() uses skb as a flag to call
dma_unmap_single().

Instead, we simply increment the skb's user count by skb_get() so that
dev_kfree_skb() can [and must] be called multiple times.

Note that the last dev_kfree_skb() in xemacps_clean_rings() will be
called after the last dma_unmap_single(), even if there is a wrap in
the middle of the packet; i.e., the socket buffer will be valid until
all DMA regions are unmapped.

Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com>
Tested-by: Anirudha Sarangi <anirudh@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
xilinx_emacps: Fix handling of skb fragments (3/3)

When a Tx packet is fragmented, the controller sets USED=1 only in the
first buffer. This means that xemacps_tx_poll() cannot "preserve" the
USED bit (which may be 0), but must set USED=1 explicitly once the
packet has been transmitted.

Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com>
Tested-by: Anirudha Sarangi <anirudh@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
xilinx_emacps: Read statistics registers only once

Statistics registers are clear-on-read, so xemacps_update_stats() must
take care to read each of them only once -- extra reads will usually
return 0, leading to inconsistencies.

Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com>
Tested-by: Anirudha Sarangi <anirudh@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
xilinx_emacps: Fix rx_errors and tx_errors

Some minor improvements in xemacps_update_stats():
o Count RXRESERR in rx_missed_errors.
o Count RXOR only in rx_fifo_errors, not twice in rx_fifo_errors and
  rx_over_errors (the latter are bundled with frame errors).
o Do not count SNGLCOLL and MULTICOLL in tx_errors (only in collisions)
  because the packets were successfully transmitted after all.

Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com>
Tested-by: Anirudha Sarangi <anirudh@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
xilinx_emacps: Log severe errors, fix tx_packets

Certain severe error conditions (which should never occur) should be
logged, in particular since the driver does not take actions to
recover; see 16.3.10 in the TRM. Some kind of dev_err() already used to
exist in previous driver versions, but got lost somehow:
o In xemacps_rx_poll(), log rx_status.HRESPNOK.
o In xemacps_tx_poll(), log tx_status.HRESPNOK and .BUFEXH.

Note: Some rx_status and tx_status error conditions are not covered by
statistics registers. There also used to be some code to increment the
net_device_stats counters, but I have refrained from re-adding it:
o rx_status.HRESPNOK: rx_errors, rx_fifo_errors
o rx_status.RXOVR:    rx_errors, rx_fifo_errors
o tx_status.HRESPNOK: tx_errors, tx_fifo_errors
o tx_status.BUFEXH:   tx_errors, tx_fifo_errors

In xemacps_tx_poll(), increment tx_packets and tx_bytes even if the
transmission failed. This is expected by SNMP (see ifOutUcastPkts in
RFC 2863: "The total number of packets that higher-level protocols
requested be transmitted, ..., including those that were discarded or
not sent."), and other Ethernet drivers also seem to handle it this way.

Note: In order to decide if an error occurred, we would need to check
the ERR bits of all buffers of a (multi-fragment) packet, not just the
last buffer; it is actually easier to drop this altogether, though.

Signed-off-by: Thomas Betker <thomas.betker@rohde-schwarz.com>
Tested-by: Anirudha Sarangi <anirudh@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
net: xemacps: Merge if-blocks

Merging two if-blocks which checked identical conditionals.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Anirudha Sarangi <anirudh@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
net: xemacps: Remove warning on round_rate failure

Assume that we deal with an input clock which is adjusted by different
means than the CCF when clk_round_rate() fails and remove the warning
message.
This allows warning free usage of an EMIO clock source w/o a CCF clock
driver on cost of that we don't detect an actual failing call to
clk_round_rate() which I think is rather unlikely to happen.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Tested-by: Anirudha Sarangi <anirudh@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
arm: zynq: Enable Cortex-A9 Errata

This patch enables the ARM Cortex-A9 errata.  Here are the list of errata:
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
               +                  +                                                +
Xilinx Answer  +  ARM Errata No.  +                 Description                    +
Record No.     +                  +                                                +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    47549      +      742231      + System Deadlock can occur in SMP Mode when the +
               +                  + Same Cache Line is Accessed by Both CPUs & ACP +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    47547      +      754322      + Following an ASID Switch, Faulty MMU Transla-  +
               +                  + tions can occur                                +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    47550      +      764369      + Cache Line Maintenance Operations by MVA might +
               +                  + not Succeed on an Inner Shareable Memory Region+
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    -----      +      742230      + DMB operation may be faulty                    +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    -----      +      743622      + Faulty hazard checking in the Store Buffer may +
               +                  + lead to data corruption                        +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    -----      +      754327      + No automatic Store Buffer drain                +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    52031      +      775420      + A data cache maintenance operation which aborts+
               +                  + might lead to deadlock                         +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    -----      +      720789      + TLBIASIDIS and TLBIMVAIS operations can broad  +
               +                  + cast a faulty ASID                             +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    -----      +      751472      + Interrupted ICIALLUIS may prevent completion of+
               +                  + broadcasted operation                          +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Signed-off-by: Srikanth Thokala <sthokal@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
zynq: dts: Remove xylon snipset

It is available already available in trd dts
and none is using this file.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
xilinx: arm: i2c: add support for graceful exit

Changes the blocking completion call to non-blocking
using the timeout variant of wait_for_completion.

Signed-off-by: Suneel Garapati <suneelg@xilinx.com>
Tested-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Merge branch 'ssw-master-next' into v4l2