[PATCH 0/2] MdeModulePkg/SdMmcPciHcDxe: Send the EdkiiSdMmcSwitchClockFreq notification before sending CMD13

["Albecki, Mateusz" <mateusz.albecki@intel.com>]

The first patch refactors the SdMmcClockSupply function with a goal
of sending the EdkiiSdMmcSwitchClockFreq notification before we send the
CMD13 to check the switch status in eMMC init flow. This is required to
avoid sending the CMD13 on link that still has not been fixed by platform.

To avoid changing the driver behavior we avoid sending notifications
when the clock is setup for the first time or when we setup the clock
after the voltage switch procedure(adressed in second patch).

The second patch in the series optimizes the SD card detection routine
to stop it from going through the process of internal clock setup
after switching the voltage. According to SD HC specification there
is no need to setup internal clock all over again.

Tests performed:
- Booted eMMC in HS400 mode on platform which required post clock freq fixes

I wasn't able to test SD card yet due to the lack of setup with working SD.

The patch series is available on github here: https://github.com/malbecki/edk2/tree/sdmmc_post_freq_notify

Cc: Hao A Wu <hao.a.wu@intel.com>
Cc: Marcin Wojtas <mw@semihalf.com>
Cc: Zhichao Gao <zhichao.gao@intel.com>
Cc: Liming Gao <liming.gao@intel.com>

Mateusz Albecki (2):
  SdMmcPciHcDxe: Send EdkiiSdMmcSwitchClockFreq after SD clock start
  MdeModulePkg/SdMmcPciHcDxe: Add function to start SD clock

 MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/EmmcDevice.c    |  20 +--
 MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdDevice.c      |  25 +---
 MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHcDxe.h |  24 ++++
 MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.c   | 136 +++++++++++----------
 MdeModulePkg/Bus/Pci/SdMmcPciHcDxe/SdMmcPciHci.h   |  45 ++-----
 5 files changed, 112 insertions(+), 138 deletions(-)

-- 
2.14.1.windows.1

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