mmc: Add more debugging for SPL

When MMC booting fails it is sometimes hard to figure out what went
wrong as there is no error code. It isn't even clear which MMC device
was chosen, since SPL can have its own numbering.

Add some debugging to help with this.

Signed-off-by: Simon Glass <sjg@chromium.org>

diff --git a/common/spl/spl_mmc.c b/common/spl/spl_mmc.c
index 1337596..1f69659 100644 (file)
--- a/common/spl/spl_mmc.c
+++ b/common/spl/spl_mmc.c
@@ -50,6 +50,7 @@ int mmc_load_image_raw_sector(struct spl_image_info *spl_image,
        ret = spl_load(spl_image, bootdev, &load, 0, sector << bd->log2blksz);
        if (ret) {
                puts("mmc_load_image_raw_sector: mmc block read error\n");
+               log_debug("(error=%d)\n", ret);
                return ret;
        }
 
@@ -76,6 +77,12 @@ static int spl_mmc_find_device(struct mmc **mmcp, int mmc_dev)
        int ret;
 
 #if CONFIG_IS_ENABLED(DM_MMC)
+       struct udevice *dev;
+       struct uclass *uc;
+
+       log_debug("Selecting MMC dev %d; seqs:\n", mmc_dev);
+       uclass_id_foreach_dev(UCLASS_MMC, dev, uc)
+               log_debug("%d: %s\n", dev_seq(dev), dev->name);
        ret = mmc_init_device(mmc_dev);
 #else
        ret = mmc_initialize(NULL);
@@ -91,6 +98,9 @@ static int spl_mmc_find_device(struct mmc **mmcp, int mmc_dev)
                       mmc_dev, ret);
                return ret;
        }
+#if CONFIG_IS_ENABLED(DM_MMC)
+       log_debug("mmc %d: %s\n", mmc_dev, (*mmcp)->dev->name);
+#endif
 
        return 0;
 }
@@ -342,6 +352,8 @@ int spl_mmc_load(struct spl_image_info *spl_image,
 
        /* Perform peripheral init only once for an mmc device */
        mmc_dev = spl_mmc_get_device_index(bootdev->boot_device);
+       log_debug("boot_device=%d, mmc_dev=%d\n", bootdev->boot_device,
+                 mmc_dev);
        if (!mmc || spl_mmc_get_mmc_devnum(mmc) != mmc_dev) {
                ret = spl_mmc_find_device(&mmc, mmc_dev);
                if (ret)