On Tue, 25 May 2021 00:30:21 +0100 Andre Przywara <andre.przyw...@arm.com> wrote:
Hi, thanks to Jaehoon for reviewing some patches in here! Can anyone else please have a look at this series? I am tempted to push them in the upcoming merge window, to expose them to a wider testing audience, but would really like to have some people's eyes on it. Also testing this on different boards would be much appreciated, especially patch 7/8 deserves some scrutiny, I guess. Thanks! Andre > While debugging some eMMC problem on the H616 SoC, I stumbled upon some > weird code in the Allwinner MMC driver. Some closer inspection and some > help from Ondrej later this series of fixes emerged: > Some patches remove part of the #ifdef hell we needlessly had in the > driver. > A big chunk is around the "new timing mode", which all "newer" SoCs > (since around 2015) have, and which requires some extra bit to be set. We > didn't enable this mode for all SoCs, this is now fixed in patches 3-6. > Patch 7 fixes a big performance problem we had due to using MMIO accesses > for the actual data transfer, as opposed to DMA transfers used in Linux. > Short from adding a lot of code to use DMA as well, we can actually halve > the number of MMIO accesses on reads, effectively doubling the bus > transfer performance. This helps the H6 a lot, but also improves the eMMC > read performance. > The final patch makes use of some generic MMC DT code, to parse generic > DT properties. This allows us to remove sunxi specific code, but also > adds support for "broken-cd" and more advanced MMC speed modes. > > Please have a look and test this code on as many boards as possible. > While a performance increase is nice, we don't want to risk data > integrity over this, so please try to verify that it still works for > you. > > Cheers, > Andre. > > P.S. Patches 5 and 6 use different approaches to differentiate between > SoCs specific quirks: Patch 5/8 selects an explicit symbol from the > SoC specific sections in our Kconfig file, while patch 6/8 compares > the selected SoC type in the C code. Please let me know which approach > is better, I can then use this for both patches (and in the future). > > Andre Przywara (8): > mmc: sunxi: Avoid #ifdefs in delay and width setup > mmc: sunxi: Fix warnings with CONFIG_PHYS_64BIT > mmc: sunxi: Fix MMC clock parent selection > mmc: sunxi: Cleanup "new timing mode" selection > mmc: sunxi: Enable "new timing mode" on all new SoCs > mmc: sunxi: Cleanup and fix self-calibration code > mmc: sunxi: Increase MMIO FIFO read performance > mmc: sunxi: Use mmc_of_parse() > > .../include/asm/arch-sunxi/clock_sun50i_h6.h | 2 +- > arch/arm/include/asm/arch-sunxi/mmc.h | 1 + > arch/arm/mach-sunxi/Kconfig | 3 + > drivers/mmc/sunxi_mmc.c | 160 +++++++++++------- > 4 files changed, 102 insertions(+), 64 deletions(-) >