Bug 102791
Summary: | mmc2: error -84 whilst initialising SD card | ||
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Product: | Drivers | Reporter: | nutrinfnon |
Component: | MMC/SD | Assignee: | drivers_mmc-sd |
Status: | RESOLVED INVALID | ||
Severity: | normal | ||
Priority: | P1 | ||
Hardware: | x86-64 | ||
OS: | Linux | ||
Kernel Version: | 4.2.0-rc6 | Subsystem: | |
Regression: | No | Bisected commit-id: | |
Attachments: | logs of all scenarios |
I think issue is due to signal voltage: cold start sd does not work cat mmc2/ios clock: 50000000 Hz actual clock: 50000000 Hz vdd: 21 (3.3 ~ 3.4 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 2 (4 bits) timing spec: 2 (sd high-speed) signal voltage: 0 (3.30 V) warm start sd works fine cat /sys/kernel/debug/mmc2/ios clock: 50000000 Hz actual clock: 50000000 Hz vdd: 17 (2.9 ~ 3.0 V) bus mode: 2 (push-pull) chip select: 0 (don't care) power mode: 2 (on) bus width: 2 (4 bits) timing spec: 7 (sd uhs DDR50) signal voltage: 1 (1.80 V) It seems, android_kernel is able to change signal voltage, mainstream does not. I don't know if the problem is in BIOS/UEFI or in kernel, so for the moment I close this bug #102791. |
Created attachment 184811 [details] logs of all scenarios I'm using tablet CHUWI 8VX 3G (baytrail 3735G with 8GB internal storage and a slot for sd). I can start debian with kernel 3.10.20 (from tablet original android installation) and with latest mainline 4.2.0-rc6. With 3.10.20 sd card works fine (obviously). With 4.2.0-rc6 there is two cases: cold start (device start from switched off) no sd device has been recognized warm start (device reboot from 3.10.20) sd works fine In attach the logs (dmesg, /sys/kernel/debugfs/gpio, /proc/interrupts): 1) log_3.10.20 all OK; 2) log_4.2.0-rc6_cold_start (sd does not work); 3) log_4.2.0-rc6_warm_start (sd works) Thanks