linux-toradex.git/Documentation, branch v3.3.8

docs: update HOWTO for 2.6.x -> 3.x versioning

2012-06-01T07:15:45+00:00

commit 591bfc6bf9e5e25e464fd4c87d64afd5135667c4 upstream.

The HOWTO document needed updating for the new kernel versioning. The
git URI for -next was updated as well.

Signed-off-by: Kees Cook 
Signed-off-by: Greg Kroah-Hartman

tcp: change tcp_adv_win_scale and tcp_rmem[2]

2012-05-12T16:32:19+00:00

[ Upstream commit b49960a05e32121d29316cfdf653894b88ac9190 ]

tcp_adv_win_scale default value is 2, meaning we expect a good citizen
skb to have skb->len / skb->truesize ratio of 75% (3/4)

In 2.6 kernels we (mis)accounted for typical MSS=1460 frame :
1536 + 64 + 256 = 1856 'estimated truesize', and 1856 * 3/4 = 1392.
So these skbs were considered as not bloated.

With recent truesize fixes, a typical MSS=1460 frame truesize is now the
more precise :
2048 + 256 = 2304. But 2304 * 3/4 = 1728.
So these skb are not good citizen anymore, because 1460 < 1728

(GRO can escape this problem because it build skbs with a too low
truesize.)

This also means tcp advertises a too optimistic window for a given
allocated rcvspace : When receiving frames, sk_rmem_alloc can hit
sk_rcvbuf limit and we call tcp_prune_queue()/tcp_collapse() too often,
especially when application is slow to drain its receive queue or in
case of losses (netperf is fast, scp is slow). This is a major latency
source.

We should adjust the len/truesize ratio to 50% instead of 75%

This patch :

1) changes tcp_adv_win_scale default to 1 instead of 2

2) increase tcp_rmem[2] limit from 4MB to 6MB to take into account
better truesize tracking and to allow autotuning tcp receive window to
reach same value than before. Note that same amount of kernel memory is
consumed compared to 2.6 kernels.

Signed-off-by: Eric Dumazet 
Cc: Neal Cardwell 
Cc: Tom Herbert 
Cc: Yuchung Cheng 
Acked-by: Neal Cardwell 
Signed-off-by: David S. Miller 
Signed-off-by: Greg Kroah-Hartman

hwmon: (zl6100) Enable interval between chip accesses for all chips

2012-03-14T16:17:03+00:00

Intersil reports that all chips supported by the zl6100 driver require
an interval between chip accesses, even ZL2004 and ZL6105 which were thought
to be safe.

Reported-by: Vivek Gani 
Cc: stable@vger.kernel.org # 3.2+
Signed-off-by: Guenter Roeck

hwmon: (w83627ehf) Describe undocumented pwm attributes

2012-03-13T10:48:07+00:00

Add description of pwm[1-4]_start_output, pwm[1-4]_step_output,
pwm[1-4]_stop_output, and pwm[1-4]_max_output attributes to driver
documentation.

Signed-off-by: Guenter Roeck 
Acked-by: Jean Delvare

hwmon: (w83627ehf) Fix temp2 source for W83627UHG

2012-03-13T10:30:56+00:00

Properly set the source of temp2 for the W83627UHG. Also fix a
comment right before that, and document the W83627UHG as reporting up
to 3 temperatures.

Signed-off-by: Jean Delvare 
Cc: Guenter Roeck 
Cc: stable@vger.kernel.org
Signed-off-by: Guenter Roeck

Merge tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux-2.6

2012-03-09T01:24:27+00:00

Pull minor devicetree bug fixes and documentation updates from Grant Likely:
 "Fixes up a duplicate #include, adds an empty implementation of
  of_find_compatible_node() and make git ignore .dtb files.  And fix up
  bus name on OF described PHYs.  Nothing exciting here."

* tag 'devicetree-for-linus' of git://git.secretlab.ca/git/linux-2.6:
  doc: dt: Fix broken reference in gpio-leds documentation
  of/mdio: fix fixed link bus name
  of/fdt.c: asm/setup.h included twice
  of: add picochip vendor prefix
  dt: add empty of_find_compatible_node function
  ARM: devicetree: Add .dtb files to arch/arm/boot/.gitignore

Merge tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging

2012-03-09T01:22:54+00:00

Pull four hwmon patches from Guenter Roeck

* tag 'hwmon-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging:
  hwmon: (jc42) Add support for AT30TS00, TS3000GB2, TSE2002GB2, and MCP9804
  hwmon: (zl6100) Maintain delay parameter in driver instance data
  hwmon: (pmbus_core) Fix maximum number of POUT alarm attributes
  hwmon: (jc42) Add support for ST Microelectronics STTS2002 and STTS3000

hwmon: (jc42) Add support for AT30TS00, TS3000GB2, TSE2002GB2, and MCP9804

2012-03-07T17:48:44+00:00

Also update IDT datasheet locations.

Signed-off-by: Guenter Roeck 
Cc: stable@vger.kernel.org # 3.0+
Acked-by: Jean Delvare

hwmon: (jc42) Add support for ST Microelectronics STTS2002 and STTS3000

2012-03-07T17:48:21+00:00

These are fully compatible with Jedec JC 42.4 as far as I can see.

Signed-off-by: Jean Delvare 
Cc: Guenter Roeck 
Cc: stable@vger.kernel.org # 3.0+
Signed-off-by: Guenter Roeck

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

2012-03-07T16:31:31+00:00

Pull input updates from Dmitry Torokhov: "Just a few driver fixups,
nothing exciting."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: wacom - fix 3rd-gen Bamboo MT when 4+ fingers are in use
  Input: twl4030-vibra - use proper guard for PM methods
  Input: evdev - fix variable initialisation
  Input: wacom - add missing LEDS_CLASS to Kconfig
  Input: ALPS - fix touchpad detection when buttons are pressed