linux-kernel - Re: [PATCH 4/8] memory: emif: Handle devices which are not rated for >85C

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Date:	Mon, 11 Mar 2013 11:08:21 +0530
From:	Santosh Shilimkar <santosh.shilimkar@...com>
To:	Lokesh Vutla <lokeshvutla@...com>
CC:	<linux-kernel@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, Nishanth Menon <nm@...com>
Subject: Re: [PATCH 4/8] memory: emif: Handle devices which are not rated
 for >85C

On Monday 11 March 2013 10:36 AM, Lokesh Vutla wrote:
> From: Nishanth Menon <nm@...com>
> 
> As per JESD209-2E specification for LPDDR2,
>       http://www.jedec.org/standards-documents/results/jesd209-2E
> Table 73, LPDDR2 memories come in two flavors - Standard and
> Extended. The Standard types can operate from -25C to +85C
> However, beyond that and upto +105C can only be supported by
> Extended types.
> 
right.

> Unfortunately, it seems there is no info in MR0(device info) or
> MR[1,2](device feature) for run time detection of this capability
> as far as seen on the spec. Hence, we provide a custom_config
> flag to be populated by platforms which have these "extended"
> type memories.
> 
> For the "Standard" memories, we need to consider MR4 notifications
> of temperature triggers >85C as equivalent to thermal shutdown
> events (equivalent to Spec specified thermal shutdown events for
> "extended" parts).
>
Make sense.
 
> Reported-by: Richard Woodruff <r-woodruff2@...com>
> Signed-off-by: Nishanth Menon <nm@...com>
> Signed-off-by: Lokesh Vutla <lokeshvutla@...com>
> ---
Thanks for the fix.
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>

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