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authorHeiko Stuebner <heiko@sntech.de>2015-10-12 19:00:54 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2015-10-26 18:00:10 +0300
commit310c805e7f133443cd57f880b73557a4a8f54b30 (patch)
tree5e3986460913c23d5185bbeceabb38275fe1cc1a /drivers/mmc
parent9eadcc0581a8ccaf4c2378aa1c193fb164304f1d (diff)
downloadlinux-310c805e7f133443cd57f880b73557a4a8f54b30.tar.xz
mmc: core: move ocr-bit to voltage translation into separate function
We will shortly need the calculation of an ocr-bit to the actual voltage in a second place too, so move it from mmc_regulator_set_ocr to a common function mmc_ocrbitnum_to_vdd to make that possible. Signed-off-by: Heiko Stuebner <heiko@sntech.de> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/core.c51
1 files changed, 35 insertions, 16 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 1a36b021b44e..7aa3b305b65d 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1277,6 +1277,40 @@ struct device_node *mmc_of_find_child_device(struct mmc_host *host,
#ifdef CONFIG_REGULATOR
/**
+ * mmc_ocrbitnum_to_vdd - Convert a OCR bit number to its voltage
+ * @vdd_bit: OCR bit number
+ * @min_uV: minimum voltage value (mV)
+ * @max_uV: maximum voltage value (mV)
+ *
+ * This function returns the voltage range according to the provided OCR
+ * bit number. If conversion is not possible a negative errno value returned.
+ */
+static int mmc_ocrbitnum_to_vdd(int vdd_bit, int *min_uV, int *max_uV)
+{
+ int tmp;
+
+ if (!vdd_bit)
+ return -EINVAL;
+
+ /*
+ * REVISIT mmc_vddrange_to_ocrmask() may have set some
+ * bits this regulator doesn't quite support ... don't
+ * be too picky, most cards and regulators are OK with
+ * a 0.1V range goof (it's a small error percentage).
+ */
+ tmp = vdd_bit - ilog2(MMC_VDD_165_195);
+ if (tmp == 0) {
+ *min_uV = 1650 * 1000;
+ *max_uV = 1950 * 1000;
+ } else {
+ *min_uV = 1900 * 1000 + tmp * 100 * 1000;
+ *max_uV = *min_uV + 100 * 1000;
+ }
+
+ return 0;
+}
+
+/**
* mmc_regulator_get_ocrmask - return mask of supported voltages
* @supply: regulator to use
*
@@ -1339,22 +1373,7 @@ int mmc_regulator_set_ocr(struct mmc_host *mmc,
int min_uV, max_uV;
if (vdd_bit) {
- int tmp;
-
- /*
- * REVISIT mmc_vddrange_to_ocrmask() may have set some
- * bits this regulator doesn't quite support ... don't
- * be too picky, most cards and regulators are OK with
- * a 0.1V range goof (it's a small error percentage).
- */
- tmp = vdd_bit - ilog2(MMC_VDD_165_195);
- if (tmp == 0) {
- min_uV = 1650 * 1000;
- max_uV = 1950 * 1000;
- } else {
- min_uV = 1900 * 1000 + tmp * 100 * 1000;
- max_uV = min_uV + 100 * 1000;
- }
+ mmc_ocrbitnum_to_vdd(vdd_bit, &min_uV, &max_uV);
result = regulator_set_voltage(supply, min_uV, max_uV);
if (result == 0 && !mmc->regulator_enabled) {