Skip to content

L
linux
Switch branch/tag
  1. 19 May, 2011 14 commits
  3. 12 Apr, 2011 3 commits
    • Dave Martin's avatar
      ARM: mxc: Correct data alignment in headsmp.S for CONFIG_THUMB2_KERNEL · 0575b4b8
      Dave Martin authored 
      Directives such as .long and .word do not magically cause the
assembler location counter to become aligned in gas.  As a
result, using these directives in code sections can result in
misaligned data words when building a Thumb-2 kernel
(CONFIG_THUMB2_KERNEL).

This is a Bad Thing, since the ABI permits the compiler to
assume that fundamental types of word size or above are word-
aligned when accessing them from C.  If the data is not really
word-aligned, this can cause impaired performance and stray
alignment faults in some circumstances.

In general, the following rules should be applied when using
data word declaration directives inside code sections:

    * .quad and .double:
         .align 3

    * .long, .word, .single, .float:
         .align (or .align 2)

    * .short:
        No explicit alignment required, since Thumb-2
        instructions are always 2 or 4 bytes in size.
        immediately after an instruction.
Signed-off-by: default avatarDave Martin <dave.martin@linaro.org>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
LAKML-Reference: 1289913217-8672-1-git-send-email-dave.martin@linaro.org
Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
      0575b4b8
    • Uwe Kleine-König's avatar
      ARM: mxs/clock-mx28: fix up name##_set_rate · f61b9fc2
      Uwe Kleine-König authored 
      For the lcdif clock get_rate looks as follows:

	read div from HW_CLKCTRL_DIS_LCDIF.DIV
	return clk_get_rate(clk->parent) / div

with clk->parent being ref_pix_clk on my system.

ref_pix_clk's rate depends on HW_CLKCTRL_FRAC1.PIXFRAC.

The set_rate function for lcdif does:

	parent_rate = clk_get_rate(clk->parent);
	based on that calculate frac and div such that
	  parent_rate * 18 / frac / div is near the requested rate.
	HW_CLKCTRL_FRAC1.PIXFRAC is updated with frac
	HW_CLKCTRL_DIS_LCDIF.DIV is updated with div

For this calculation to be correct parent_rate needs to be
initialized not with the clock rate of lcdif's parent (i.e. ref_pix) but
that of its grandparent (i.e. ref_pix' parent == pll0_clk).

The obvious downside of this patch is that now set_rate(lcdif) changes
its parent's rate, too.  Still this is better than a wrong rate.
Acked-by: default avatarShawn Guo <shawn.guo@freescale.com>
LAKML-Reference: 20110225084950.GA13684@S2101-09.ap.freescale.net
Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
      f61b9fc2
    • Uwe Kleine-König's avatar
      ARM: imx: fix usb related build failure for mach-vpr200 · 32a90b6e
      Uwe Kleine-König authored 
      This was broken by

	4bd597b6 (ARM i.MX ehci: do ehci init in board specific functions)

and fixes:

  CC      arch/arm/mach-mx3/mach-vpr200.o
arch/arm/mach-mx3/mach-vpr200.c:263: error: unknown field 'flags' specified in initializer
arch/arm/mach-mx3/mach-vpr200.c:264: warning: initialization makes pointer from integer without a cast

by just applying the change to mach-vpr200.c that the other machine files
got by 4bd597b6.

LAKML-Reference: 1302257029-17397-1-git-send-email-u.kleine-koenig@pengutronix.de
Acked-by: default avatarMarc Reilly <marc@cpdesign.com.au>
Signed-off-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: default avatarSascha Hauer <s.hauer@pengutronix.de>
      32a90b6e
  5. 06 Apr, 2011 1 commit
  7. 05 Apr, 2011 22 commits
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7