From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Andrey Pronin <apronin@chromium.org>
Cc: Peter Huewe <peterhuewe@gmx.de>,
Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>,
Marcel Selhorst <tpmdd@selhorst.net>,
tpmdd-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org,
groeck@chromium.org, smbarber@chromium.org,
dianders@chromium.org
Subject: Re: [PATCH 0/2] tpm: add driver for cr50 on SPI
Date: Thu, 14 Jul 2016 21:28:14 -0600 [thread overview]
Message-ID: <20160715032814.GG9347@obsidianresearch.com> (raw)
In-Reply-To: <20160715025026.GA21375@apronin>
On Thu, Jul 14, 2016 at 07:50:26PM -0700, Andrey Pronin wrote:
> Yes, it has a TCG-compliant interface, however, there are several things
> specific to this device:
> - need to ensure a certain delay between spi transactions, or else
> the chip can miss several first bytes.
> - if there is no spi activity for this chip, it may go to sleep, and
> needs to be waken up before sending further commands.
> - it has some vendor-specific registers accessible from spi bus.
This all needs to be commented clearly in the driver..
The chip sounds pretty broken...
Jason
WARNING: multiple messages have this Message-ID (diff)
From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Andrey Pronin <apronin-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>
Cc: dianders-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
smbarber-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org,
tpmdd-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org,
groeck-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org
Subject: Re: [PATCH 0/2] tpm: add driver for cr50 on SPI
Date: Thu, 14 Jul 2016 21:28:14 -0600 [thread overview]
Message-ID: <20160715032814.GG9347@obsidianresearch.com> (raw)
In-Reply-To: <20160715025026.GA21375@apronin>
On Thu, Jul 14, 2016 at 07:50:26PM -0700, Andrey Pronin wrote:
> Yes, it has a TCG-compliant interface, however, there are several things
> specific to this device:
> - need to ensure a certain delay between spi transactions, or else
> the chip can miss several first bytes.
> - if there is no spi activity for this chip, it may go to sleep, and
> needs to be waken up before sending further commands.
> - it has some vendor-specific registers accessible from spi bus.
This all needs to be commented clearly in the driver..
The chip sounds pretty broken...
Jason
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next prev parent reply other threads:[~2016-07-15 3:28 UTC|newest]
Thread overview: 78+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-15 2:20 [PATCH 0/2] tpm: add driver for cr50 on SPI Andrey Pronin
2016-07-15 2:20 ` [PATCH 1/2] tpm: devicetree: document properties for cr50 Andrey Pronin
2016-07-15 2:20 ` Andrey Pronin
2016-07-15 4:05 ` Guenter Roeck
2016-07-15 17:31 ` Andrey Pronin
2016-07-15 17:31 ` Andrey Pronin
2016-07-15 18:28 ` Guenter Roeck
2016-07-15 18:28 ` Guenter Roeck
2016-07-17 13:28 ` Rob Herring
2016-07-17 13:28 ` Rob Herring
2016-07-15 2:20 ` [PATCH 2/2] tpm: add driver for cr50 on SPI Andrey Pronin
2016-07-15 2:20 ` Andrey Pronin
2016-07-15 3:32 ` Jason Gunthorpe
2016-07-15 3:32 ` Jason Gunthorpe
2016-07-15 3:44 ` Andrey Pronin
2016-07-15 3:44 ` Andrey Pronin
2016-07-19 12:55 ` Jarkko Sakkinen
2016-07-19 12:55 ` Jarkko Sakkinen
2016-07-20 0:24 ` Andrey Pronin
2016-07-20 0:24 ` Andrey Pronin
2016-07-20 17:03 ` Jason Gunthorpe
2016-07-20 17:03 ` Jason Gunthorpe
2016-07-21 18:10 ` Andrey Pronin
2016-07-21 18:10 ` Andrey Pronin
2016-07-21 21:00 ` Jason Gunthorpe
2016-07-21 21:00 ` Jason Gunthorpe
2016-07-15 2:28 ` [PATCH 0/2] " Peter Huewe
2016-07-15 2:28 ` Peter Huewe
2016-07-15 2:50 ` Andrey Pronin
2016-07-15 3:28 ` Jason Gunthorpe [this message]
2016-07-15 3:28 ` Jason Gunthorpe
2016-07-15 17:15 ` Andrey Pronin
2016-07-15 17:15 ` Andrey Pronin
2016-07-19 12:56 ` Jarkko Sakkinen
2016-07-20 3:41 ` [PATCH v2 " Andrey Pronin
2016-07-20 3:41 ` Andrey Pronin
2016-07-20 3:41 ` [PATCH v2 1/2] tpm: devicetree: document properties for cr50 Andrey Pronin
2016-07-20 3:41 ` Andrey Pronin
2016-07-20 19:03 ` Rob Herring
2016-07-20 19:49 ` Andrey Pronin
2016-07-20 19:49 ` Andrey Pronin
2016-07-20 19:54 ` Jason Gunthorpe
2016-07-20 19:54 ` Jason Gunthorpe
2016-07-27 21:02 ` Andrey Pronin
2016-07-27 21:02 ` Andrey Pronin
2016-07-21 21:03 ` Rob Herring
2016-07-21 21:03 ` Rob Herring
2016-07-27 21:00 ` Andrey Pronin
2016-07-27 21:00 ` Andrey Pronin
2016-07-20 3:41 ` [PATCH v2 2/2] tpm: add driver for cr50 on SPI Andrey Pronin
2016-07-20 3:41 ` Andrey Pronin
2016-07-25 17:09 ` Aw: [PATCH v2 0/2] " Peter Huewe
2016-07-25 17:09 ` Peter Huewe
2016-07-27 21:12 ` Andrey Pronin
2016-07-28 4:25 ` [PATCH v3 " Andrey Pronin
2016-07-28 4:25 ` Andrey Pronin
2016-07-28 4:25 ` [PATCH v3 1/2] tpm: devicetree: document properties for cr50 Andrey Pronin
2016-07-28 4:25 ` Andrey Pronin
2016-07-28 4:25 ` [PATCH v3 2/2] tpm: add driver for cr50 on SPI Andrey Pronin
2016-07-28 4:25 ` Andrey Pronin
2016-07-28 23:01 ` Dmitry Torokhov
2016-07-28 23:17 ` Jason Gunthorpe
2016-07-28 23:17 ` Jason Gunthorpe
2016-07-29 3:01 ` Andrey Pronin
2016-07-29 3:01 ` Andrey Pronin
2016-07-29 1:55 ` [PATCH v4 0/2] " Andrey Pronin
2016-07-29 1:55 ` Andrey Pronin
2016-07-29 1:55 ` [PATCH v4 1/2] tpm: devicetree: document properties for cr50 Andrey Pronin
2016-07-29 1:55 ` Andrey Pronin
2016-07-29 17:27 ` Jason Gunthorpe
2016-07-29 17:27 ` Jason Gunthorpe
2016-07-29 21:42 ` Rob Herring
2016-07-29 21:42 ` Rob Herring
2016-08-09 10:08 ` Jarkko Sakkinen
2016-08-09 10:08 ` Jarkko Sakkinen
2016-07-29 1:55 ` [PATCH v4 2/2] tpm: add driver for cr50 on SPI Andrey Pronin
2016-07-29 1:55 ` Andrey Pronin
2016-08-09 10:20 ` Jarkko Sakkinen
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