mmc: sdhci-pci-gli: Add runtime PM for GL9763E

Add runtime PM for GL9763E and disable PLL in runtime suspend. So power
gated of upstream port can be enabled. GL9763E has an auxiliary power
so it keep states in runtime suspend. In runtime resume, PLL is enabled
and waits for it to stabilize.

Signed-off-by: Ben Chuang <ben.chuang@genesyslogic.com.tw>
Tested-by: Kevin Chang <kevin.chang@lcfuturecenter.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20220307090009.1386876-1-benchuanggli@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index ab099cdb081cd2d9c01581dc8e43a33d4cffaa5e..d09728c37d03e91c8d4704183f37610993235c07 100644 (file)
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -13,6 +13,7 @@
 #include <linux/mmc/mmc.h>
 #include <linux/delay.h>
 #include <linux/of.h>
+#include <linux/iopoll.h>
 #include "sdhci.h"
 #include "sdhci-pci.h"
 #include "cqhci.h"
@@ -951,6 +952,47 @@ static void gli_set_gl9763e(struct sdhci_pci_slot *slot)
        pci_write_config_dword(pdev, PCIE_GLI_9763E_VHS, value);
 }
 
+#ifdef CONFIG_PM
+static int gl9763e_runtime_suspend(struct sdhci_pci_chip *chip)
+{
+       struct sdhci_pci_slot *slot = chip->slots[0];
+       struct sdhci_host *host = slot->host;
+       u16 clock;
+
+       clock = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+       clock &= ~(SDHCI_CLOCK_PLL_EN | SDHCI_CLOCK_CARD_EN);
+       sdhci_writew(host, clock, SDHCI_CLOCK_CONTROL);
+
+       return 0;
+}
+
+static int gl9763e_runtime_resume(struct sdhci_pci_chip *chip)
+{
+       struct sdhci_pci_slot *slot = chip->slots[0];
+       struct sdhci_host *host = slot->host;
+       u16 clock;
+
+       clock = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+
+       clock |= SDHCI_CLOCK_PLL_EN;
+       clock &= ~SDHCI_CLOCK_INT_STABLE;
+       sdhci_writew(host, clock, SDHCI_CLOCK_CONTROL);
+
+       /* Wait max 150 ms */
+       if (read_poll_timeout(sdhci_readw, clock, (clock & SDHCI_CLOCK_INT_STABLE),
+                             1000, 150000, false, host, SDHCI_CLOCK_CONTROL)) {
+               pr_err("%s: PLL clock never stabilised.\n",
+                      mmc_hostname(host->mmc));
+               sdhci_dumpregs(host);
+       }
+
+       clock |= SDHCI_CLOCK_CARD_EN;
+       sdhci_writew(host, clock, SDHCI_CLOCK_CONTROL);
+
+       return 0;
+}
+#endif
+
 static int gli_probe_slot_gl9763e(struct sdhci_pci_slot *slot)
 {
        struct pci_dev *pdev = slot->chip->pdev;
@@ -1060,6 +1102,11 @@ const struct sdhci_pci_fixes sdhci_gl9763e = {
 #ifdef CONFIG_PM_SLEEP
        .resume         = sdhci_cqhci_gli_resume,
        .suspend        = sdhci_cqhci_gli_suspend,
+#endif
+#ifdef CONFIG_PM
+       .runtime_suspend = gl9763e_runtime_suspend,
+       .runtime_resume  = gl9763e_runtime_resume,
+       .allow_runtime_pm = true,
 #endif
        .add_host       = gl9763e_add_host,
 };