[PATCH v2 13/18] mmc: Add more debugging for SPL

[Simon Glass]

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 at chromium.org>
---

Changes in v2:
- Drop the unnecessary interior check for CONFIG_IS_ENABLED(DM_MMC)

 common/spl/spl_mmc.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/common/spl/spl_mmc.c b/common/spl/spl_mmc.c
index 1337596eca0..1f696593216 100644
--- 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)
-- 
2.43.0