[PATCH 0/3] Add phase map support in dw_mmc-rockchip

[Ulf Hansson]

On Mon, 9 Mar 2026 at 04:29, Shawn Lin <shawn.lin at rock-chips.com> wrote:
>
>
> Hi Ulf and Jeahoon,
>
> Currently, in dw_mmc-rockchip, the rockchip,default-sample-phase is only used
> for some lower speed sampling, while the output-phase configurations are fixed
> based on timing settings for all SoCs and boards.
>
> Subsequent validation shows that this approach fails to achieve optimal timing
> performance on many chips and development boards, failing to meet test requirements.
> Since different timing profiles demand distinct phase configurations, we introduce
> phase map support to dw_mmc-rockchip to address this issue.
>
> Additionally, given that dw_mmc-hi3798mv200 already utilizes phase map functionality,
> we avoid reinventing the wheel by moving the phase map parsing logic into the core
> dw_mmc framework (similar to how mmc_of_parse() is implemented), rather than duplicating
> code in the rockchip driver.
>
> This change maintains backward compatibility: the original default_sample_phase and fixed
> drv phase configurations for different modes are preserved, with phase map values taking
> precedence when configured.
>
>
>
> Shawn Lin (3):
>   mmc: dw_mmc: Add parsing mmc_clk_phase_map support
>   mmc: dw_mmc-hi3798mv200: Using phase map from dw_mmc core
>   mmc: dw_mmc-rockchip: Add phase map support
>
>  drivers/mmc/host/dw_mmc-hi3798mv200.c | 11 ++++-------
>  drivers/mmc/host/dw_mmc-rockchip.c    | 27 ++++++++++++++++++---------
>  drivers/mmc/host/dw_mmc.c             |  2 ++
>  drivers/mmc/host/dw_mmc.h             |  2 ++
>  4 files changed, 26 insertions(+), 16 deletions(-)
>
> --
> 2.7.4
>

The series applied for next, thanks!

Kind regards
Uffe