Hi Marc,
Maybe we can have some input from Subhash on this matter. I believe a
revert can be feasible until a working solution exist.
Kind regards
Ulf Hansson
On 06/04/2012 06:35 PM, Marc Dietrich wrote:
Hi,
somehow I hope this would go away by itself, but it didn't :-( I reported this
problem some time ago (see: http://www.mail-archive.com/linux-
mmc@xxxxxxxxxxxxxxx/msg13688.html ) but got no clear answer or fix.
In addition to the information I posted on the thread above, I also dumped the
contents of the ext_csd register file (where reg values are not zero):
reg Sandisk Toshiba
241 10 0x0a 50 0x32
239 0 0x00 51 0x33
238 0 0x00 119 0x77
234 0 0x00 30 0x1e
232 1 0x01 4 0x04
231 21 0x15 21 0x15
230 150 0x96 16 0x10
229 150 0x96 66 0x42
228 1 0x01 7 0x07
226 8 0x08 16 0x10
225 6 0x06 7 0x07
224 4 0x04 8 0x08
223 1 0x01 2 0x02
222 8 0x08 16 0x10
221 16 0x10 1 0x01
220 8 0x08 7 0x07
219 7 0x07 7 0x07
217 16 0x10 17 0x11
215 1 0x01 0 0x00
214 218 0xda 238 0xee
213 160 0xa0 128 0x80
210 10 0x0a 0 0x00
209 10 0x0a 60 0x3c
208 10 0x0a 0 0x00
207 10 0x0a 60 0x3c
206 10 0x0a 0 0x00
205 10 0x0a 30 0x1e
203 0 0x00 51 0x33
202 0 0x00 51 0x33
201 0 0x00 119 0x77
200 0 0x00 119 0x77
196 3 0x03 7 0x07
194 2 0x02 2 0x02
192 5 0x05 5 0x05
185 1 0x01 1 0x01
181 0 0x00 1 0x01
179 0 0x00 1 0x01
175 0 0x00 1 0x01
169 1 0x01 0 0x00
168 0 0x00 2 0x02
160 3 0x03 3 0x03
158 0 0x00 3 0x03
157 237 0xed 186 0xba
The second and the third column is from a device with a Sandisk eMCC which
works fine, while the last two columns are from a Toshiba eMMC which shows the
error. Looking into it, I found that only the Toshiba eMMC specifies a
powerclass in registers 203-200 while Sandisk does not, so the powerclass is
not changed in the latter case and the problem cannot be triggered there.
I also attached a boot log with mmc debug enabled. I think there is not much I
can do else. Either this eMMC is just bogus and needs blacklisting or there is
some problem in the driver code.
I hope this problem can be fixed or if it can't, I hope that commit 3d93576e
(mmc: core: skip card initialization if power class selection fails) is
reverted until the issues are sorted out.
Greetings,
Marc
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