Re: [PATCH 09/19] clock-imx35: fix reboot in internal boot modeg

From: Sascha Hauer
Date: Tue Dec 13 2011 - 05:00:56 EST


On Tue, Dec 13, 2011 at 07:31:41AM +0100, Eric Bénard wrote:
> commit 8d75a2620dc3e33ce504044c375c443ed7ed4128 disable IIM
> clock after reading silicon revision which will prevent
> reboot in internal boot mode (see comment a few line before)

I'm a bit unsure. The fix you suggest is the least intrusive, but
a proper fix would be to move the mentioned block below the
imx_print_silicon_rev, like this:

clk_enable(&iim_clk);
imx_print_silicon_rev("i.MX35", mx35_revision());
clk_disable(&iim_clk);

/*
* Check if we came up in internal boot mode. If yes, we need
* some
* extra clocks turned on, otherwise the MX35 boot ROM code will
* hang after a watchdog reset.
*/
if (!(__raw_readl(CCM_BASE + CCM_RCSR) & (3 << 10))) {
clk_enable(&iim_clk);
clk_enable(&uart1_clk);
clk_enable(&scc_clk);
}

This would also get the clk enable counters right.

Sascha

>
> Signed-off-by: Eric Bénard <eric@xxxxxxxxxx>
> Cc: Jason Liu <jason.hui@xxxxxxxxxx>
> Cc: Sascha Hauer <kernel@xxxxxxxxxxxxxx>
> ---
> arch/arm/mach-imx/clock-imx35.c | 5 ++++-
> 1 files changed, 4 insertions(+), 1 deletions(-)
>
> diff --git a/arch/arm/mach-imx/clock-imx35.c b/arch/arm/mach-imx/clock-imx35.c
> index 8116f11..b49a732 100644
> --- a/arch/arm/mach-imx/clock-imx35.c
> +++ b/arch/arm/mach-imx/clock-imx35.c
> @@ -538,7 +538,10 @@ int __init mx35_clocks_init()
>
> clk_enable(&iim_clk);
> imx_print_silicon_rev("i.MX35", mx35_revision());
> - clk_disable(&iim_clk);
> + /* Don't disable IIM clock if we came up in internal boot mode */
> + if (__raw_readl(CCM_BASE + CCM_RCSR) & (3 << 10)) {
> + clk_disable(&iim_clk);
> + }
>
> #ifdef CONFIG_MXC_USE_EPIT
> epit_timer_init(&epit1_clk,
> --
> 1.7.6.4
>
>

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