target/linux/bcm27xx/patches-5.4/950-0403-mmc-sdhci-iproc-Fix-vmmc-regulators-on-iProc.patch

   1 From 703920ad5199c46f98cf107c75a2de61608f85fd Mon Sep 17 00:00:00 2001
   2 From: Phil Elwell <phil@raspberrypi.org>
   3 Date: Fri, 2 Aug 2019 15:20:11 +0100
   4 Subject: [PATCH] mmc: sdhci-iproc: Fix vmmc regulators on iProc
   5
   6 The Linux support for controlling card power via regulators appears to
   7 be contentious. I would argue that the default behaviour is contrary to
   8 the SDHCI spec - turning off the power writes a reserved value to the
   9 SD Bus Voltage Select field of the Power Control Register, which
  10 seems to kill the Arasan/iProc controller - but fortunately there is a
  11 hook in sdhci_ops to override the behaviour. Borrow the implementation
  12 from sdhci_arasan_set_power.
  13
  14 Signed-off-by: Phil Elwell <phil@raspberrypi.org>
  15 ---
  16  drivers/mmc/host/sdhci-iproc.c | 12 ++++++++++++
  17  1 file changed, 12 insertions(+)
  18
  19 --- a/drivers/mmc/host/sdhci-iproc.c
  20 +++ b/drivers/mmc/host/sdhci-iproc.c
  21 @@ -173,6 +173,17 @@ static unsigned int sdhci_iproc_get_max_
  22                 return pltfm_host->clock;
  23  }
  24
  25 +static void sdhci_iproc_set_power(struct sdhci_host *host, unsigned char mode,
  26 +                                 unsigned short vdd)
  27 +{
  28 +       if (!IS_ERR(host->mmc->supply.vmmc)) {
  29 +               struct mmc_host *mmc = host->mmc;
  30 +
  31 +               mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
  32 +       }
  33 +       sdhci_set_power_noreg(host, mode, vdd);
  34 +}
  35 +
  36  static const struct sdhci_ops sdhci_iproc_ops = {
  37         .set_clock = sdhci_set_clock,
  38         .get_max_clock = sdhci_iproc_get_max_clock,
  39 @@ -190,6 +201,7 @@ static const struct sdhci_ops sdhci_ipro
  40         .write_b = sdhci_iproc_writeb,
  41         .set_clock = sdhci_set_clock,
  42         .get_max_clock = sdhci_iproc_get_max_clock,
  43 +       .set_power = sdhci_iproc_set_power,
  44         .set_bus_width = sdhci_set_bus_width,
  45         .reset = sdhci_reset,
  46         .set_uhs_signaling = sdhci_set_uhs_signaling,