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mmc: sdhci-msm: Send a disable vote to make RMP driver consistent

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Removing SD card at UEFI/XBL stage can lead to regulator getting turned off
due to MGPI but RPM isn't aware of that.
Kernel comes up with vote_count = 0 and we call enable API but RPM
ignores this thinking that it is already turned on leading the vdd
regulator in OFF state despite our vote.
CMD timeouts are seen in our sd_init path due to this and card detection
fails.

After the first enable vote, send a disable vote followed by re-enable
vote to make the RPM driver consistent with the regulator state.

Change-Id: Ifb761d07f13daa271c10c5454195f9e55ef17833
Signed-off-by: Sarthak Garg <quic_sartgarg@quicinc.com>
Reviewed-on: https://gerrit.mot.com/2193867
Reviewed-by: Chuanchun Zhu <zhucc2@motorola.com>
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Huosheng Liao <liaohs@motorola.com>
Submit-Approved: Jira Key
This commit is contained in:
Sarthak Garg 2022-01-12 09:50:15 +05:30 • committed by Xiaojun Ji
commit 1f59df2378
1 changed files with 12 additions and 1 deletions
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13
drivers/mmc/host/sdhci-msm.c
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@ -474,6 +474,7 @@ struct sdhci_msm_host {
int sdiowakeup_irq;
bool is_sdiowakeup_enabled;
bool sdio_pending_processing;
bool first_power_on;
};
static struct sdhci_msm_host *sdhci_slot[2];
@ -2264,8 +2265,14 @@ static int sdhci_msm_setup_vreg(struct sdhci_msm_host *msm_host,
for (i = 0; i < ARRAY_SIZE(vreg_table); i++) {
if (vreg_table[i]) {
if (enable)
if (enable) {
ret = sdhci_msm_vreg_enable(vreg_table[i]);
if (msm_host->first_power_on && !(mmc->caps & MMC_CAP_NONREMOVABLE)) {
ret = sdhci_msm_vreg_disable(vreg_table[i]);
msleep(1);
ret = sdhci_msm_vreg_enable(vreg_table[i]);
}
}
else
ret = sdhci_msm_vreg_disable(vreg_table[i]);
if (ret)
@ -2273,6 +2280,9 @@ static int sdhci_msm_setup_vreg(struct sdhci_msm_host *msm_host,
}
}
if (enable && !(mmc->caps & MMC_CAP_NONREMOVABLE))
msm_host->first_power_on = false;
if (enable && !(mmc->caps & MMC_CAP_NONREMOVABLE)) {
/*
@ -4297,6 +4307,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
msm_host = sdhci_pltfm_priv(pltfm_host);
msm_host->mmc = host->mmc;
msm_host->pdev = pdev;
msm_host->first_power_on = true;
ret = mmc_of_parse(host->mmc);
if (ret)