tree 805f086332d7ef6b8646e41efb431b7fc05fc35b
parent 621d3ce830649d56ef1c9611e370d05ceaffd7fc
author Gregory CLEMENT <gregory.clement@bootlin.com> 1564047942 +0200
committer Mark Brown <broonie@kernel.org> 1565370262 +0100
gpgsig -----BEGIN PGP SIGNATURE-----
 
 iQFHBAABCgAxFiEEreZoqmdXGLWf4p/qJNaLcl1Uh9AFAl1Np5YTHGJyb29uaWVA
 a2VybmVsLm9yZwAKCRAk1otyXVSH0D28B/476u8ngt2munDNn1bTxHPRmvWhr90M
 5h3wHp4RcH5nhu75bT/5tIIsDkFwRuyHqnkePYjvEY6nSL28Ql3VoBj9uSZcjidN
 183tTbEdC/g3Qwd8dpcHTPXMv0BDMGNbGHBedpeeCxXzHkudw7+AqcK50yK+kZBr
 RsKpPHxx6qgT/eoCLli4y4M1fZkKzeSfXEDu28ogO3nYWCtD/7xezcKPKRiULh0P
 AhA+dvc4dA/4VedyPyJKu1VyiiJ6M8QWHg0s9dyIALGXhpDYblI/0zwK9kVJb69h
 TX1t1smxSQnhZesZag5cgvCI4Ur73PNcGz4xssHmbhKN2nch6A1/xmCt
 =IRFM
 -----END PGP SIGNATURE-----

regulator: twl6030: workaround the VMMC reset behavior

During reset the VMMC regulator doesn't reach 0V and only drops to
1.8V, furthermore the pulse width is under 200us whereas the SD
specification expect 1ms.

The WR_S bit allows the TWL6030 to no reset at all the VMMC during warm
reset and keep the current voltage. Thanks to this workaround the SD
card doesn't reach a undefined reset stage.

Actually this behavior is available for all the LDO regulator, so the
driver will also allow to use it with any of these regulator.

Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Link: https://lore.kernel.org/r/20190725094542.16547-4-gregory.clement@bootlin.com
Signed-off-by: Mark Brown <broonie@kernel.org>