[v5.5] Fix up eSDHC issue on P2020

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The upstream commit broke P2020 eSDHC.
fe0acab mmc: sdhci-of-esdhc: fix P2020 errata handling

While the issue was fixed by later commit.
2aa3d82 mmc: sdhci-of-esdhc: fix esdhc_reset() for different controller versions

The commit fe0acab had been applied to stable kernel 5.5, 5.4,
4.19, 4.14, 4.9, and 4.4 without that fix-up.

To fix up P2020 eSDHC on the stable kernels, backport the fix-up 2aa3d82
kernel 5.4 and 5.5.

Please help to revert fe0acab on 4.19, 4.14, 4.9 and 4.4, since there are
many conflicts to cherry-pick the fix-up, and fe0acab is actually not strongly
required for handling errata which is hardly triggered.

The email thread for the issue discussion.
https://www.spinics.net/lists/stable/msg375823.html

Yangbo Lu (4):
  mmc: sdhci-of-esdhc: fix esdhc_reset() for different controller
    versions
  mmc: sdhci-of-esdhc: fix clock setting for different controller
    versions
  mmc: sdhci-of-esdhc: fix transfer mode register reading
  mmc: sdhci-of-esdhc: fix serious issue clock is always disabled

 drivers/mmc/host/sdhci-of-esdhc.c | 174 +++++++++++++++++++++++++-------------
 1 file changed, 114 insertions(+), 60 deletions(-)

-- 
2.7.4




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