From: dirk.behme@de•bosch.com (Dirk Behme)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH 0/3] ARM: imx6: fix up buggy CCM_CSCMR1 register
Date: Fri, 12 Jul 2013 11:15:43 +0200 [thread overview]
Message-ID: <51DFC93F.4020209@de.bosch.com> (raw)
In-Reply-To: <1373469722-32514-1-git-send-email-shawn.guo@linaro.org>
On 10.07.2013 17:21, Shawn Guo wrote:
> There is a defect in bits 22 and 21 of i.MX6 CCM_CSCMR1 register. These
> two bits are inverted between read and write. That said, bit field
> CCM_CSCMR1[22-20] (aclk/emi_podf on imx6q/dl and lcdif_pix_podf on
> imx6sl) will be something as below between read and write.
>
> read write divider
> 000 110 1
> 001 111 2
> 010 100 3
> 011 101 4
> 100 010 5
> 101 011 6
> 110 000 7
> 111 001 8
>
> To work around this hardware defect, every single read/modify/write
> sequence on the register will require a fix-up (invert bits 22 and 21)
> before writing the value into register. As there are dividers and
> multiplexers defined in the register, we choose to inherit the basic
> clk-divider and clk-mux and override the functions which writes register
> with a fix-up hooked in.
>
> Shawn
>
> Liu Ying (3):
> ARM: imx: add common clock support for fixup div
> ARM: imx: add common clock support for fixup mux
> ARM: imx6: change some clocks to fixup clocks
>
> arch/arm/mach-imx/Makefile | 3 +-
> arch/arm/mach-imx/clk-fixup-div.c | 129 +++++++++++++++++++++++++++++++++++++
> arch/arm/mach-imx/clk-fixup-mux.c | 107 ++++++++++++++++++++++++++++++
> arch/arm/mach-imx/clk-imx6q.c | 24 +++----
> arch/arm/mach-imx/clk-imx6sl.c | 20 +++---
> arch/arm/mach-imx/clk.c | 26 ++++++++
> arch/arm/mach-imx/clk.h | 10 +++
> 7 files changed, 296 insertions(+), 23 deletions(-)
> create mode 100644 arch/arm/mach-imx/clk-fixup-div.c
> create mode 100644 arch/arm/mach-imx/clk-fixup-mux.c
For the whole series:
Acked-by: Dirk Behme <dirk.behme@de•bosch.com>
Thanks
Dirk
prev parent reply other threads:[~2013-07-12 9:15 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-10 15:21 [PATCH 0/3] ARM: imx6: fix up buggy CCM_CSCMR1 register Shawn Guo
2013-07-10 15:22 ` [PATCH 1/3] ARM: imx: add common clock support for fixup div Shawn Guo
2013-07-10 15:22 ` [PATCH 2/3] ARM: imx: add common clock support for fixup mux Shawn Guo
2013-07-10 15:22 ` [PATCH 3/3] ARM: imx6: change some clocks to fixup clocks Shawn Guo
2013-07-12 9:15 ` Dirk Behme [this message]
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