mmc: tmio: use -EPROBE_DEFER if driver can't find regulator

Current tmio driver tries to use default ocr_avail if 1) it couldn't
find regulator and 2) if platform data doesn't have ocr_mask.
But, there is no guarantee that regulator driver probe is faster than
TMIO driver probe.  TMIO driver will not use regulator in such case.

By this patch, TMIO driver returns -EPROBE_DEFER if it couldn't find
regulator and if platform doesn't have ocr_mask.  Because, there is a
possibility that regulator has not been probed, but the user expects it.

This patch changes tmio_mmc_host_probe() behavior, but there is no user
who has conflict.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index 6c07e70..b94cb16 100644 (file)
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -944,17 +944,25 @@ static const struct mmc_host_ops tmio_mmc_ops = {
        .enable_sdio_irq = tmio_mmc_enable_sdio_irq,
 };
 
-static void tmio_mmc_init_ocr(struct tmio_mmc_host *host)
+static int tmio_mmc_init_ocr(struct tmio_mmc_host *host)
 {
        struct tmio_mmc_data *pdata = host->pdata;
        struct mmc_host *mmc = host->mmc;
 
        mmc_regulator_get_supply(mmc);
 
+       /* use ocr_mask if no regulator */
        if (!mmc->ocr_avail)
-               mmc->ocr_avail = pdata->ocr_mask ? : MMC_VDD_32_33 | MMC_VDD_33_34;
-       else if (pdata->ocr_mask)
-               dev_warn(mmc_dev(mmc), "Platform OCR mask is ignored\n");
+               mmc->ocr_avail =  pdata->ocr_mask;
+
+       /*
+        * try again.
+        * There is possibility that regulator has not been probed
+        */
+       if (!mmc->ocr_avail)
+               return -EPROBE_DEFER;
+
+       return 0;
 }
 
 static void tmio_mmc_of_parse(struct platform_device *pdev,
@@ -1008,6 +1016,10 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host,
        /* SD control register space size is 0x200, 0x400 for bus_shift=1 */
        _host->bus_shift = resource_size(res_ctl) >> 10;
 
+       ret = tmio_mmc_init_ocr(_host);
+       if (ret < 0)
+               goto host_free;
+
        _host->ctl = ioremap(res_ctl->start, resource_size(res_ctl));
        if (!_host->ctl) {
                ret = -ENOMEM;
@@ -1023,7 +1035,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host **host,
                mmc->max_segs;
        mmc->max_req_size = mmc->max_blk_size * mmc->max_blk_count;
        mmc->max_seg_size = mmc->max_req_size;
-       tmio_mmc_init_ocr(_host);
 
        _host->native_hotplug = !(pdata->flags & TMIO_MMC_USE_GPIO_CD ||
                                  mmc->caps & MMC_CAP_NEEDS_POLL ||