[edk2-devel] [PATCH 0/1] Fix eMMC bus timing switch issue

[Marcin Wojtas]

Thanks! Everything keep working on my boards:

Tested-by: Marcin Wojtas <mw at semihalf.com>

Best regards,
Marcin

pt., 27 wrz 2019 o 03:38 Wu, Hao A <hao.a.wu at intel.com> napisał(a):

> Hello Marcin,
>
>
>
> I have uploaded the V2 series to my fork.
>
> You can get the patch at:
>
> https://github.com/hwu25/edk2/tree/emmc_busmode_v2
>
>
>
> Best Regards,
>
> Hao Wu
>
>
>
> *From:* Marcin Wojtas [mailto:mw at semihalf.com]
> *Sent:* Thursday, September 26, 2019 3:25 PM
> *To:* Albecki, Mateusz
> *Cc:* edk2-devel-groups-io; Wu, Hao A
> *Subject:* Re: [PATCH 0/1] Fix eMMC bus timing switch issue
>
>
>
> Hi Mateusz,
>
>
>
> For the v2, could you please push the patches to some repo, so that it
> would be easy to fetch and test?
>
>
>
> Best regards,
>
> Marcin
>
>
>
> pon., 23 wrz 2019 o 10:37 Albecki, Mateusz <mateusz.albecki at intel.com>
> napisał(a):
>
> SD host controller specification section 3.9 recommends that controller's
> bus timing
> should be switched after card's bus timing has been switched. In current
> eMMC
> driver implementation every host controller switch has been done before
> call to
> EmmcSwitchBusTiming which is causing issues on some eMMC controllers.
>
> In HS200 switch sequence we removed stopping and starting the SD clock when
> switching the host controller timing. Stopping the clock before bus timing
> switch is only neccessary if preset value enable is set in host
> controller.
> Current code doesn't check if this field is enabled or doesn't support
> this feature for any other bus timing change so it has been removed.
>
> Tests performed:
> - eMMC enumeration and OS boot in HS400
> - eMMC enumeration and OS boot in HS200
> - eMMC enumeration and OS boot in high speed SDR 8bit @52MHz
>
> Tests have been performed on 2 eMMC host controllers. One that has been
> failing
> with old driver and one that has been passing with old driver. Both
> controllers
> pass all tests with multiple eMMC devices used.
>
> Note: We were unable to test DDR speed mode because on test machines both
> new flow
> and old flow was failing with this speed. I suspect it is a hardware
> problem.
>
> Cc: Hao A Wu <hao.a.wu at intel.com>
> Cc: Marcin Wojtas <mw at semihalf.com>
>
> Albecki, Mateusz (1):
>   MdeModulePkg/SdMmcPciHcDxe: Fix bus timing switch sequence
>
>  MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c | 54
> +++----------------------
>  1 file changed, 5 insertions(+), 49 deletions(-)
>
> --
> 2.14.1.windows.1
>
> --------------------------------------------------------------------
>
> Intel Technology Poland sp. z o.o.
> ul. Slowackiego 173 | 80-298 Gdansk | Sad Rejonowy Gdansk Polnoc | VII
> Wydzial Gospodarczy Krajowego Rejestru Sadowego - KRS 101882 | NIP
> 957-07-52-316 | Kapital zakladowy 200.000 PLN.
>
> Ta wiadomosc wraz z zalacznikami jest przeznaczona dla okreslonego
> adresata i moze zawierac informacje poufne. W razie przypadkowego
> otrzymania tej wiadomosci, prosimy o powiadomienie nadawcy oraz trwale jej
> usuniecie; jakiekolwiek
> przegladanie lub rozpowszechnianie jest zabronione.
> This e-mail and any attachments may contain confidential material for the
> sole use of the intended recipient(s). If you are not the intended
> recipient, please contact the sender and delete all copies; any review or
> distribution by
> others is strictly prohibited.
>
>

-=-=-=-=-=-=-=-=-=-=-=-
Groups.io Links: You receive all messages sent to this group.

View/Reply Online (#48222): https://edk2.groups.io/g/devel/message/48222
Mute This Topic: https://groups.io/mt/34262001/1813853
Group Owner: devel+owner at edk2.groups.io
Unsubscribe: https://edk2.groups.io/g/devel/unsub  [edk2-devel-archive at redhat.com]
-=-=-=-=-=-=-=-=-=-=-=-

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/edk2-devel-archive/attachments/20190927/fa5b81df/attachment.htm>