>From what I understand... High speed SD cards have 1.8V regulators
inside them(sourced by vmmc (what we power the SD card with)). So in
terms of the SD card IO pins they will either use exactly vmmc or
1.8V. It doesn't make sense for vqmmc (the voltage we use to power the
AP block connected to
From what I understand... High speed SD cards have 1.8V regulators
inside them(sourced by vmmc (what we power the SD card with)). So in
terms of the SD card IO pins they will either use exactly vmmc or
1.8V. It doesn't make sense for vqmmc (the voltage we use to power the
AP block connected to the
Addy,
On Mon, Nov 24, 2014 at 6:38 PM, Addy wrote:
>> In worst case scenario, VDD = 3.6V and VIO = 2.7V. That gives as the
>> factor of 0.75, thus we are inside spec but without margins.
>
> * From eMMC4.5 spec:
> 1. (VDDF)vcc: Supply voltage for flash memory, which is 2.7v -- 3.3v
> 2.
Ulf,
On Mon, Nov 24, 2014 at 5:29 AM, Ulf Hansson wrote:
>> 2. Several people I've talked to have expressed concerns that our
>> minimum value is 2.7V. Apparently that's really on the edge and makes
>> EEs a little nervous. The quick sample of cards sitting on my desk
>> shows that they seem
On Fri, Nov 24, 2014 at 9:29 PM, Ulf Hansson
wrote:
On 21 November 2014 at 22:04, Doug Anderson wrote:
Hi,
On Fri, Nov 21, 2014 at 9:42 AM, Doug Anderson wrote:
Ulf,
On Fri, Nov 21, 2014 at 4:06 AM, Ulf Hansson wrote:
[...]
Sure
If the first card is sd2.0 since startup,
On 21 November 2014 at 22:04, Doug Anderson wrote:
> Hi,
>
> On Fri, Nov 21, 2014 at 9:42 AM, Doug Anderson wrote:
>> Ulf,
>>
>> On Fri, Nov 21, 2014 at 4:06 AM, Ulf Hansson wrote:
>>> [...]
>>>
Sure
If the first card is sd2.0 since startup, dw_mci_switch_voltage will not
be
On 21 November 2014 at 22:04, Doug Anderson diand...@chromium.org wrote:
Hi,
On Fri, Nov 21, 2014 at 9:42 AM, Doug Anderson diand...@chromium.org wrote:
Ulf,
On Fri, Nov 21, 2014 at 4:06 AM, Ulf Hansson ulf.hans...@linaro.org wrote:
[...]
Sure
If the first card is sd2.0 since startup,
On Fri, Nov 24, 2014 at 9:29 PM, Ulf Hansson ulf.hans...@linaro.org
wrote:
On 21 November 2014 at 22:04, Doug Anderson diand...@chromium.org wrote:
Hi,
On Fri, Nov 21, 2014 at 9:42 AM, Doug Anderson diand...@chromium.org wrote:
Ulf,
On Fri, Nov 21, 2014 at 4:06 AM, Ulf Hansson
Ulf,
On Mon, Nov 24, 2014 at 5:29 AM, Ulf Hansson ulf.hans...@linaro.org wrote:
2. Several people I've talked to have expressed concerns that our
minimum value is 2.7V. Apparently that's really on the edge and makes
EEs a little nervous. The quick sample of cards sitting on my desk
shows
Addy,
On Mon, Nov 24, 2014 at 6:38 PM, Addy addy...@rock-chips.com wrote:
In worst case scenario, VDD = 3.6V and VIO = 2.7V. That gives as the
factor of 0.75, thus we are inside spec but without margins.
* From eMMC4.5 spec:
1. (VDDF)vcc: Supply voltage for flash memory, which is 2.7v --
Hi,
On Fri, Nov 21, 2014 at 9:42 AM, Doug Anderson wrote:
> Ulf,
>
> On Fri, Nov 21, 2014 at 4:06 AM, Ulf Hansson wrote:
>> [...]
>>
>>> 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
>>
Ulf,
On Fri, Nov 21, 2014 at 4:06 AM, Ulf Hansson wrote:
> [...]
>
>> 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.
Hmmm, I think you're right.
On 11/21/2014 09:06 PM, Ulf Hansson wrote:
> [...]
>
>> 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.
Since dw_mci_switch_voltage() is invoked,
[...]
> 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.
>
[...]
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
On 11/21/2014 09:06 PM, Ulf Hansson wrote:
[...]
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.
Since dw_mci_switch_voltage() is invoked, voltage is
Ulf,
On Fri, Nov 21, 2014 at 4:06 AM, Ulf Hansson ulf.hans...@linaro.org wrote:
[...]
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.
Hmmm, I think you're
Hi,
On Fri, Nov 21, 2014 at 9:42 AM, Doug Anderson diand...@chromium.org wrote:
Ulf,
On Fri, Nov 21, 2014 at 4:06 AM, Ulf Hansson ulf.hans...@linaro.org wrote:
[...]
Sure
If the first card is sd2.0 since startup, dw_mci_switch_voltage will not be
called,
That can't be right.
On 2014/11/13 02:04, Doug Anderson wrote:
> Ulf,
>
> On Tue, Nov 11, 2014 at 12:52 AM, Ulf Hansson wrote:
>> On 11 November 2014 05:02, Addy Ke wrote:
>>> SD2.0 cards need vqmmc and vmmc to be the same.
>>
>> No, that's not correct.
>>
>> If I remember the spec correctly, the bus signal
Ulf,
On Tue, Nov 11, 2014 at 12:52 AM, Ulf Hansson wrote:
> On 11 November 2014 05:02, Addy Ke wrote:
>> SD2.0 cards need vqmmc and vmmc to be the same.
>
> No, that's not correct.
>
> If I remember the spec correctly, the bus signal threshold is 0.75 * VDD.
As usual, I will first state my
Ulf,
On Tue, Nov 11, 2014 at 12:52 AM, Ulf Hansson ulf.hans...@linaro.org wrote:
On 11 November 2014 05:02, Addy Ke addy...@rock-chips.com wrote:
SD2.0 cards need vqmmc and vmmc to be the same.
No, that's not correct.
If I remember the spec correctly, the bus signal threshold is 0.75 * VDD.
On 2014/11/13 02:04, Doug Anderson wrote:
Ulf,
On Tue, Nov 11, 2014 at 12:52 AM, Ulf Hansson ulf.hans...@linaro.org wrote:
On 11 November 2014 05:02, Addy Ke addy...@rock-chips.com wrote:
SD2.0 cards need vqmmc and vmmc to be the same.
No, that's not correct.
If I remember the spec
On 11 November 2014 05:02, Addy Ke wrote:
> SD2.0 cards need vqmmc and vmmc to be the same.
No, that's not correct.
If I remember the spec correctly, the bus signal threshold is 0.75 * VDD.
> But vqmmc call regulator_set_voltage to set min_uv(2.7v) as far as possible.
I guess you want to do
On 11 November 2014 05:02, Addy Ke addy...@rock-chips.com wrote:
SD2.0 cards need vqmmc and vmmc to be the same.
No, that's not correct.
If I remember the spec correctly, the bus signal threshold is 0.75 * VDD.
But vqmmc call regulator_set_voltage to set min_uv(2.7v) as far as possible.
I
SD2.0 cards need vqmmc and vmmc to be the same.
But vqmmc call regulator_set_voltage to set min_uv(2.7v) as far as possible.
So if we set vmmc 3.3V in dt table, we will get error information as follows:
[ 17.785398] mmc_host mmc1: Bus speed (slot 0) = 5000Hz (slot req
5000Hz, actual
SD2.0 cards need vqmmc and vmmc to be the same.
But vqmmc call regulator_set_voltage to set min_uv(2.7v) as far as possible.
So if we set vmmc 3.3V in dt table, we will get error information as follows:
[ 17.785398] mmc_host mmc1: Bus speed (slot 0) = 5000Hz (slot req
5000Hz, actual
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