Re: [PATCH V1 3/3] mmc: sdhci: Allow platform controlled voltage switching
From: Veerabhadrarao Badiganti
Date: Wed May 20 2020 - 07:19:32 EST
On 5/19/2020 11:36 AM, Adrian Hunter wrote:
On 15/05/20 2:18 pm, Veerabhadrarao Badiganti wrote:
From: Vijay Viswanath <vviswana@xxxxxxxxxxxxxx>
If vendor platform drivers are controlling whole logic of voltage
switching, then sdhci driver no need control vqmmc regulator.
So skip enabling/disable vqmmc from SDHC driver.
Signed-off-by: Vijay Viswanath <vviswana@xxxxxxxxxxxxxx>
Signed-off-by: Veerabhadrarao Badiganti <vbadigan@xxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 32 +++++++++++++++++++-------------
drivers/mmc/host/sdhci.h | 1 +
2 files changed, 20 insertions(+), 13 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 1bb6b67..c010823 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -4098,6 +4098,7 @@ int sdhci_setup_host(struct sdhci_host *host)
unsigned int override_timeout_clk;
u32 max_clk;
int ret;
+ bool enable_vqmmc = false;
WARN_ON(host == NULL);
if (host == NULL)
@@ -4111,9 +4112,12 @@ int sdhci_setup_host(struct sdhci_host *host)
* the host can take the appropriate action if regulators are not
* available.
*/
- ret = mmc_regulator_get_supply(mmc);
- if (ret)
- return ret;
+ if (!mmc->supply.vqmmc) {
+ ret = mmc_regulator_get_supply(mmc);
+ if (ret)
+ return ret;
+ enable_vqmmc = true;
+ }
DBG("Version: 0x%08x | Present: 0x%08x\n",
sdhci_readw(host, SDHCI_HOST_VERSION),
@@ -4373,7 +4377,15 @@ int sdhci_setup_host(struct sdhci_host *host)
mmc->caps |= MMC_CAP_NEEDS_POLL;
if (!IS_ERR(mmc->supply.vqmmc)) {
- ret = regulator_enable(mmc->supply.vqmmc);
+ if (enable_vqmmc) {
+ ret = regulator_enable(mmc->supply.vqmmc);
+ if (ret) {
+ pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
+ mmc_hostname(mmc), ret);
+ mmc->supply.vqmmc = ERR_PTR(-EINVAL);
+ }
+ host->vqmmc_enabled = !ret;
+ }
/* If vqmmc provides no 1.8V signalling, then there's no UHS */
if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000,
@@ -4386,12 +4398,6 @@ int sdhci_setup_host(struct sdhci_host *host)
if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000,
3600000))
host->flags &= ~SDHCI_SIGNALING_330;
-
- if (ret) {
- pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
- mmc_hostname(mmc), ret);
- mmc->supply.vqmmc = ERR_PTR(-EINVAL);
- }
}
if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V) {
@@ -4625,7 +4631,7 @@ int sdhci_setup_host(struct sdhci_host *host)
return 0;
unreg:
- if (!IS_ERR(mmc->supply.vqmmc))
+ if (host->vqmmc_enabled)
regulator_disable(mmc->supply.vqmmc);
undma:
if (host->align_buffer)
@@ -4643,7 +4649,7 @@ void sdhci_cleanup_host(struct sdhci_host *host)
{
struct mmc_host *mmc = host->mmc;
- if (!IS_ERR(mmc->supply.vqmmc))
+ if (host->vqmmc_enabled)
regulator_disable(mmc->supply.vqmmc);
if (host->align_buffer)
@@ -4780,7 +4786,7 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
destroy_workqueue(host->complete_wq);
- if (!IS_ERR(mmc->supply.vqmmc))
+ if (host->vqmmc_enabled)
regulator_disable(mmc->supply.vqmmc);
if (host->align_buffer)
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 8d2a096..24d27e1 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -570,6 +570,7 @@ struct sdhci_host {
u32 caps1; /* CAPABILITY_1 */
bool read_caps; /* Capability flags have been read */
+ bool vqmmc_enabled; /* Vqmmc is enabled */
Last time around there was dissatisfaction with this variable name. Perhaps
change it to sdhci_core_to_disable_vqmmc
Sure Adrian. Will update this variable name.
unsigned int ocr_avail_sdio; /* OCR bit masks */
unsigned int ocr_avail_sd;
unsigned int ocr_avail_mmc;