Re: [PATCH v3 2/3] mmc: usdhi6rol0: add support for UHS modes

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On 04/20/2016 04:53 PM, Lars Persson wrote:
Add a start_signal_voltage_switch() operation to support enabling of
UHS modes.

Signed-off-by: Lars Persson <larper@xxxxxxxx>
---
  drivers/mmc/host/usdhi6rol0.c | 13 +++++++++++++
  1 file changed, 13 insertions(+)

diff --git a/drivers/mmc/host/usdhi6rol0.c b/drivers/mmc/host/usdhi6rol0.c
index 807c06e..2585ea4 100644
--- a/drivers/mmc/host/usdhi6rol0.c
+++ b/drivers/mmc/host/usdhi6rol0.c
@@ -1147,12 +1147,25 @@ static void usdhi6_enable_sdio_irq(struct mmc_host *mmc, int enable)
  	}
  }

+static int usdhi6_sig_volt_switch(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+	int ret;
+

To support boards without regulator we need to put a IS_ERR_OR_NULL(mmc->supply.vqmmc) check here and bail out with return 0. Missing vqmmc is OK according to our binding document, but treated as an error by mmc_regulator_set_vqmmc().


+	ret = mmc_regulator_set_vqmmc(mmc, ios);
+
+	if (ret < 0)
+		dev_warn(mmc_dev(mmc), "Voltage switch failed: %d\n", ret);
+
+	return ret;
+}
+
  static struct mmc_host_ops usdhi6_ops = {
  	.request	= usdhi6_request,
  	.set_ios	= usdhi6_set_ios,
  	.get_cd		= usdhi6_get_cd,
  	.get_ro		= usdhi6_get_ro,
  	.enable_sdio_irq = usdhi6_enable_sdio_irq,
+	.start_signal_voltage_switch = usdhi6_sig_volt_switch,
  };

  /*			State machine handlers				*/

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