> -----Original Message----- > From: linux-mmc-owner@xxxxxxxxxxxxxxx > [mailto:linux-mmc-owner@xxxxxxxxxxxxxxx] On Behalf Of Ulf Hansson > Sent: Wednesday, September 03, 2014 3:21 PM > To: Jean-Michel Hautbois; Dong, Chuanxiao > Cc: linux-mmc; chris@xxxxxxxxxx > Subject: Re: [PATCH v3] mmc: core: try 1.8v signling in ddr mode if host and > device > > On 2 September 2014 17:31, Jean-Michel Hautbois <jhautbois@xxxxxxxxx> > wrote: > > 2014-08-15 10:36 GMT+02:00 Dong, Chuanxiao > <chuanxiao.dong@xxxxxxxxx>: > >> > >> > >>> -----Original Message----- > >>> From: Ulf Hansson [mailto:ulf.hansson@xxxxxxxxxx] > >>> Sent: Friday, August 15, 2014 4:34 PM > >>> To: Dong, Chuanxiao > >>> Cc: linux-mmc; chris@xxxxxxxxxx > >>> Subject: Re: [PATCH v3] mmc: core: try 1.8v signling in ddr mode if > >>> host and device > >>> > >>> On 15 August 2014 05:28, Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx> > >>> wrote: > >>> > Even (e)MMC card can support 3.3v to 1.2v vccq in DDR, but not all > >>> > host controller can support this, like some of the SDHCI host > >>> > which connect to an eMMC device. Some of these host controller > >>> > still needs to use 1.8v vccq for supporting DDR mode. > >>> > > >>> > So the sequence will be: > >>> > if (host and device can both support 1.2v IO) > >>> > use 1.2v IO; > >>> > else if (host and device can both support 1.8v IO) > >>> > use 1.8v IO; > >>> > so if host and device can only support 3.3v IO, this is the last choice. > >>> > > >>> > Signed-off-by: Chuanxiao Dong <chuanxiao.dong@xxxxxxxxx> > >>> > Signed-off-by: Yunpeng Gao <yunpeng.gao@xxxxxxxxx> > >>> > >>> This looks good to me! But before I queue it for 3.18 I would > >>> appreciate if we could get some help in testing this for some > >>> various platforms, that support MMC DDR. > >> > >> Thanks a lot. BTW, this patch is already tested on Intel's platform which can > support MMC DDR. > > > > This patch associated with vqmmc-supply and vmmc-supply in the DT is > > working for me too on i.MX6. > > JM > > Thanks! Applied for next. > > I took the liberty of updating the commit msg header to "mmc: core: > Fix sequence for I/O voltage in DDR mode for eMMC", to get a better > description of the patch. > > I also added a tested by tag from "JM". > > Please tell me if you have any concern with my changes. No concern from my side. Thanks JM for testing this patch, and also thanks Ulf for making this patch better :) Thanks Chuanxiao > > Kind regards > Uffe > -- > To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body > of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at > http://vger.kernel.org/majordomo-info.html ��.n��������+%������w��{.n�����{��i��)�� jg��� �����ݢj����G���� ���j:+v���w�m������w�������h�����٥
