From: ulf.hansson@linaro.org (Ulf Hansson)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] mmc: dw_mmc: try pick the exact same voltage as vmmc for vqmmc
Date: Fri, 21 Nov 2014 13:06:18 +0100 [thread overview]
Message-ID: <CAPDyKFrzGfDew0eLLEcA+_iS_mo-O2bFU58fjirfXXA8AJ9UYQ@mail.gmail.com> (raw)
In-Reply-To: <5464152E.7040209@rock-chips.com>
[...]
> Sure
> If the first card is sd2.0 since startup, dw_mci_switch_voltage will not be called,
That can't be right. mmc_power_up() should trigger
dw_mci_switch_voltage() to be invoked.
> and card can be identified. But if UHS card is pulgged in first, the vqmmc will be down to 1.8v.
>
> when sd2.0 card is pulgged in, mmc core will call dw_mci_switch_voltage to change vqmmc to 3.3v
> (MMC_SINGLE_VOTAGE_330). So vqmmc will be set 2.7v, if we request 2.7-3.6v.
>
> But vmmc is always 3.3v,becuase it be set min_volt = max_volt = 3.3v in dt tables.
>
> So the result:
> vmmc = 3.3v and vqmmc = 2.7v, and sd2.0 card is failed to identify in my test.
Hmm. I wonder why it works the first time? Could it be that your
regulator have voltage ramp up time that isn't properly considered?
Kind regards
Uffe
next prev parent reply other threads:[~2014-11-21 12:06 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-30 2:21 [PATCH] mmc: dw_mmc: add a quirk for the defferent bit of sdio interrupt Addy Ke
2014-10-30 4:35 ` Jaehoon Chung
2014-10-30 4:41 ` Doug Anderson
2014-10-30 4:49 ` Doug Anderson
2014-10-30 6:54 ` addy ke
2014-10-30 10:50 ` [PATCH] mmc: dw_mmc: add support for the other " Addy Ke
2014-10-30 11:02 ` Jaehoon Chung
2014-10-31 0:46 ` addy ke
2014-10-31 1:14 ` Jaehoon Chung
2014-10-30 11:11 ` Ulf Hansson
2014-10-30 11:17 ` Jaehoon Chung
2014-10-31 0:54 ` addy ke
2014-10-31 3:50 ` [PATCH v2] " Addy Ke
2014-10-31 5:14 ` Doug Anderson
2014-10-31 8:45 ` Jaehoon Chung
2014-10-31 15:55 ` Doug Anderson
2014-10-31 10:43 ` Heiko Stübner
2014-11-03 0:54 ` addy ke
2014-11-03 1:20 ` [PATCH v3] " Addy Ke
2014-11-03 8:59 ` Jaehoon Chung
2014-11-03 10:23 ` addy ke
2014-11-04 2:14 ` Jaehoon Chung
2014-11-03 10:23 ` Heiko Stübner
2014-11-04 2:15 ` Jaehoon Chung
2014-11-04 14:03 ` [PATCH v4] " Addy Ke
2014-11-11 4:02 ` [PATCH] mmc: dw_mmc: try pick the exact same voltage as vmmc for vqmmc Addy Ke
2014-11-11 8:52 ` Ulf Hansson
2014-11-12 18:04 ` Doug Anderson
2014-11-13 2:19 ` addy ke
2014-11-21 12:06 ` Ulf Hansson [this message]
2014-11-21 12:29 ` Jaehoon Chung
2014-11-21 17:42 ` Doug Anderson
2014-11-21 21:04 ` Doug Anderson
2014-11-24 13:29 ` Ulf Hansson
2014-11-25 2:38 ` Addy
2014-11-25 5:36 ` Doug Anderson
2014-11-25 21:11 ` Alexandru Stan
2014-11-25 5:29 ` Doug Anderson
2014-11-13 18:58 ` [PATCH v4] mmc: dw_mmc: add support for the other bit of sdio interrupt Doug Anderson
2014-11-14 13:25 ` Jaehoon Chung
2014-11-19 10:32 ` Ulf Hansson
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