[RFT PATCH 0/2] mmc: meson-gx: improve MMC reliabilty

[Neil Armstrong]

Hi,

On 15/09/2023 18:01, Jerome Brunet wrote:
> Amlogic MMC on the GX (and later) SoCs has been problematic for years,
> especially with u-boot.
> 
> Linux has been fairly stable for a few years. It is using a fixed phase
> setting with Core = 180, Tx = 0 and Rx = 0 (the latter cannot be set
> starting from the v3 MMC IPs)
> 
> Still the results were not good with those settings with u-boot, on some
> sm1 based platforms. U-boot then started using a 270 core phase for sm1
> only.  This worked for most sm1 platforms but problems persist on others.
> 
> The proposal with this patchset is to use 270 for the ID phase, 180
> otherwise.  This works well on the platforms I have tested (Libretech's
> boards and VIM3L)
> 
> It would be great if others could test this and report whether this work
> for them or not.
> 
> If the results are good, this might be ported to Linux as well (... but the
> situation is less critical there)
> 
> Jerome Brunet (2):
>    mmc: meson-gx: clean up and align on Linux settings
>    mmc: meson-gx: set 270 core phase during the identification
> 
>   drivers/mmc/meson_gx_mmc.c | 50 ++++++++++++++++++--------------------
>   drivers/mmc/meson_gx_mmc.h |  9 +++++--
>   2 files changed, 31 insertions(+), 28 deletions(-)
> 

I'll apply on my test branch which triggers my autobuilder providing ready-to-boot
binaries for most of the supported platforms:
https://gitlab.com/superna9999/amlogic-u-boot-autotest/-/pipelines

Neil