Difference between revisions of "Tests:SD-SDHI-SDR104"
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| − | == Indicative Speed == | + | === Indicative Speed === |
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| − | === Salvator-X/r8a7795 (DMA) === | + | ==== Salvator-X/r8a7795 (DMA) ==== |
The results for Salvator-X/r8a7795 somewhat slow due to the absence of DMA support. | The results for Salvator-X/r8a7795 somewhat slow due to the absence of DMA support. | ||
Revision as of 13:21, 30 August 2016
This document describes how to test the SDR104 functionality of the SDHI MMC driver.
Contents
Kernel Version and Configuration
SDR-104 support for the SDHI driver is currently available in a topic branch:
git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git topic/sdr104-v5
For the tests described here the kernel was compiled with the shmobile_defconfig. DEBUG_FS was also enabled.
It is critical that MMC_SDHI is enabled for this testing.
Hardware Environment
- Boards/Socs
- Lager/r8a7790 (Gen 2 R-Car H2 SoC)
- Salvator-X/r8a7795 (Gen 3 R-Car H3 SoC)
- MMC Cards:
- SanDisk Card 1: SanDisk Ultra 64Gb microSDXC UHS-1. Identifier on Packaging: SDSQUNC-064G-GN6MA
- SanDisk Card 2: SanDisk Extreme Pro 8Gb microSDHC UHS-1. Appears to be: SDSDQXP-008G-J35
- Samsung Card 1: Samsung 32Gb microSDHC Card Class 10 UHS-1 U3. ModelCode: MB-MG32EA/FFP
- Samsung Card 2: Samsung 32Gb microSDHC Card Class 10 UHS-1 U3. ModelCode: MB-MG32DA/FFP
Verify SDR-104 Support
The patches above enable SDR-104 for
- SDHI0 slot of the Lager/r8a7790 board
- SDHI0 and 3 slots of the Salvator-X/r8a7795 board
After inserting a card which supports SDR-104, for example one of the cards listed above, it should be possible to verify that SDR-104 support is enabled.
$ dmesg | grep SDR mmc1: new ultra high speed SDR104 SDHC card at address 0001
# mount -t debugfs none /sys/kernel/debug # cat /sys/kernel/debug/mmc1/ios clock: 195000000 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: 6 (sd uhs SDR104) signal voltage: 1 (1.80 V) driver type: 0 (driver type B)
Indicative Speed
Lager/r8a7785
Sandisk Card 1:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null 536870912 bytes (537 MB) copied, 11.901 s, 45.1 MB/s
Sandisk Card 2:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null 536870912 bytes (537 MB) copied, 11.1349 s, 48.2 MB/s
Samsung Card 1:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null 536870912 bytes (537 MB) copied, 14.697 s, 36.5 MB/s
Samsung Card 2:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null 536870912 bytes (537 MB) copied, 14.7366 s, 36.4 MB/s
Salvator-X/r8a7795
Sandisk Card 1:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null 67108864 bytes (67 MB) copied, 11.2324 s, 6.0 MB/s
Sandisk Card 2:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null 67108864 bytes (67 MB) copied, 11.1973 s, 6.0 MB/s
Salvator-X/r8a7795 (DMA)
The results for Salvator-X/r8a7795 somewhat slow due to the absence of DMA support. Below the tests are a re-run with Prototype Gen 3 R-Car SDHI DMA support rebased and merged with the SDR-104 topic branch described above.The resulting code is in the following branch:
git://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas.git topic/sdr104-v5+sdhi-dma-v3
Sandisk Card 1:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null 67108864 bytes (67 MB) copied, 1.8201 s, 36.9 MB/s
Sandisk Card 2:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null 67108864 bytes (67 MB) copied, 1.70105 s, 39.5 MB/s
Control
The above run without the SDR-104 patches applied.
Here the test has been run using a kernel compiled using the base of the topic branch described above. The head commit is d11882edea06 ("Merge tag 'renesas-next-20160427v2-v4.6-rc1' into HEAD").
In this test SDR50 is enabled but SDR104 is not.
$ dmesg | grep SDR mmc1: new ultra high speed SDR50 SDHC card at address 0001
# mount -t debugfs none /sys/kernel/debug # cat /sys/kernel/debug/mmc1/ios clock: 100000000 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: 5 (sd uhs SDR50) signal voltage: 1 (1.80 V) driver type: 0 (driver type B)
Indicative Speed
Sandisk Card 1:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null SanDisk Card 1: 536870912 bytes (537 MB) copied, 17.7253 s, 30.3 MB/s
Sandisk Card 2:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null SanDisk Card 2: 536870912 bytes (537 MB) copied, 15.6158 s, 34.4 MB/s
Samsung Card 1:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null Samsung Card 1: 536870912 bytes (537 MB) copied, 20.7866 s, 25.8 MB/s
Samsung Card 2:
# dd bs=1M count=512 iflag=direct if=/dev/mmcblk1 of=/dev/null Samsung Card 2: 536870912 bytes (537 MB) copied, 19.3648 s, 27.7 MB/s
