[PATCH v2 1/5] mmc: host: sdhci-s3c: Add broken-voltage DT property for broken voltage quirk
From: Chris Ball <hidden>
Date: 2012-09-19 10:47:02
Also in:
linux-mmc, linux-samsung-soc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
Possibly related (same subject, not in this thread)
- 2012-09-20 · [PATCH v2 1/5] mmc: host: sdhci-s3c: Add broken-voltage DT property for broken voltage quirk · jh80.chung@samsung.com (Jaehoon Chung)
- 2012-09-19 · [PATCH v2 1/5] mmc: host: sdhci-s3c: Add broken-voltage DT property for broken voltage quirk · Chris Ball <hidden>
- 2012-09-19 · [PATCH v2 1/5] mmc: host: sdhci-s3c: Add broken-voltage DT property for broken voltage quirk · Tomasz Figa <hidden>
- 2012-09-19 · [PATCH v2 1/5] mmc: host: sdhci-s3c: Add broken-voltage DT property for broken voltage quirk · Chris Ball <hidden>
- 2012-09-19 · [PATCH v2 1/5] mmc: host: sdhci-s3c: Add broken-voltage DT property for broken voltage quirk · Tomasz Figa <hidden>
Hi, On Wed, Sep 19 2012, Tomasz Figa wrote:
We could just check if the regulator provides the capability to change the voltage. I don't see any direct way of querying the regulator for provided capabilities (correct me if I'm just blind), but calling regulator_count_voltages() on the regulator and checking if the returned value is 1 should be enough to assume that the regulator is fixed.
Sounds good, I agree. Are you able to test that the obvious patch below works on your fixed-regulator board? Jaehoon and Adrian, can you think of any reason why we shouldn't replace MMC_CAP2_BROKEN_VOLTAGE with the regulator_count_voltages() call below? Thanks.
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 044cd01..a3cc740 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c@@ -1132,7 +1132,7 @@ int mmc_regulator_set_ocr(struct mmc_host *mmc, */ voltage = regulator_get_voltage(supply); - if (mmc->caps2 & MMC_CAP2_BROKEN_VOLTAGE) + if (regulator_count_voltages(supply) == 1) min_uV = max_uV = voltage; if (voltage < 0)
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Chris Ball <cjb@laptop.org> <http://printf.net/>
One Laptop Per Child