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mfd: madera: Add special errata reset handling for cs47l15 

An errata exists for cs47l15 where the reset must be handled
differently and removed before DCVDD is applied. A soft reset is used
for situations where a reset is required to reset state. This does
however, make this part unsuitable for DCVDD supplies with a rise time
greater than 2mS.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Charles Keepax 2020-10-27 09:41:32 +00:00 committed by Lee Jones
parent 1cd7b935d2
commit f594d01bb4
2 changed files with 21 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/mfd/madera-core.c
View File

@ -38,6 +38,9 @@
#define MADERA_RESET_MIN_US 2000
#define MADERA_RESET_MAX_US 3000
#define ERRATA_DCVDD_MIN_US 10000
#define ERRATA_DCVDD_MAX_US 15000
static const char * const madera_core_supplies[] = {
"AVDD",
"DBVDD1",
@ -291,7 +294,8 @@ static int __maybe_unused madera_runtime_resume(struct device *dev)
dev_dbg(dev, "Leaving sleep mode\n");
madera_enable_hard_reset(madera);
if (!madera->reset_errata)
madera_enable_hard_reset(madera);
ret = regulator_enable(madera->dcvdd);
if (ret) {
@ -302,9 +306,12 @@ static int __maybe_unused madera_runtime_resume(struct device *dev)
regcache_cache_only(madera->regmap, false);
regcache_cache_only(madera->regmap_32bit, false);
madera_disable_hard_reset(madera);
if (madera->reset_errata)
usleep_range(ERRATA_DCVDD_MIN_US, ERRATA_DCVDD_MAX_US);
else
madera_disable_hard_reset(madera);
if (!madera->pdata.reset) {
if (!madera->pdata.reset || madera->reset_errata) {
ret = madera_wait_for_boot(madera);
if (ret)
goto err;
@ -503,6 +510,8 @@ int madera_dev_init(struct madera *madera)
*/
switch (madera->type) {
case CS47L15:
madera->reset_errata = true;
break;
case CS47L35:
case CS47L90:
case CS47L91:
@ -553,13 +562,19 @@ int madera_dev_init(struct madera *madera)
goto err_dcvdd;
}
if (madera->reset_errata)
madera_disable_hard_reset(madera);
ret = regulator_enable(madera->dcvdd);
if (ret) {
dev_err(dev, "Failed to enable DCVDD: %d\n", ret);
goto err_enable;
}
madera_disable_hard_reset(madera);
if (madera->reset_errata)
usleep_range(ERRATA_DCVDD_MIN_US, ERRATA_DCVDD_MAX_US);
else
madera_disable_hard_reset(madera);
regcache_cache_only(madera->regmap, false);
regcache_cache_only(madera->regmap_32bit, false);
@ -667,7 +682,7 @@ int madera_dev_init(struct madera *madera)
* It looks like a device we support. If we don't have a hard reset
* we can now attempt a soft reset.
*/
if (!madera->pdata.reset) {
if (!madera->pdata.reset || madera->reset_errata) {
ret = madera_soft_reset(madera);
if (ret)
goto err_reset;

1
include/linux/mfd/madera/core.h
View File

@ -186,6 +186,7 @@ struct madera {
struct regulator_bulk_data core_supplies[MADERA_MAX_CORE_SUPPLIES];
struct regulator *dcvdd;
bool internal_dcvdd;
bool reset_errata;
struct madera_pdata pdata;