mmc: Add support for JMicron 388 SD/MMC controller

JMicron 388 SD/MMC combo controller supports the 1.8V low-voltage for
SD, but MMC doesn't work with the low-voltage, resulting in an error
at probing.

This patch adds the support for multiple voltage mask per device type,
so that SD works with 1.8V while MMC forces 3.3V.  Here new ocr_avail_*
fields for each device are introduced, so that the actual OCR mask is
switched dynamically.

Also, the restriction of low-voltage in core/sd.c is removed when the
bit is allowed explicitly via ocr_avail_sd mask.

This patch was rewritten from scratch based on Aries' original code.

Signed-off-by: Aries Lee <arieslee@jmicron.com>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Reviewed-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Chris Ball <cjb@laptop.org>

3 files changed, 8 insertions, 1 deletions

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 77f93c3b8808..76bb621e9aa9 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -745,6 +745,8 @@ int mmc_attach_mmc(struct mmc_host *host, u32 ocr)
 	WARN_ON(!host->claimed);
 
 	mmc_attach_bus_ops(host);
+	if (host->ocr_avail_mmc)
+		host->ocr_avail = host->ocr_avail_mmc;
 
 	/*
 	 * We need to get OCR a different way for SPI.
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index 49da4dffd28e..de062ebd8b26 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -772,6 +772,8 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 	WARN_ON(!host->claimed);
 
 	mmc_sd_attach_bus_ops(host);
+	if (host->ocr_avail_sd)
+		host->ocr_avail = host->ocr_avail_sd;
 
 	/*
 	 * We need to get OCR a different way for SPI.
@@ -795,7 +797,8 @@ int mmc_attach_sd(struct mmc_host *host, u32 ocr)
 		ocr &= ~0x7F;
 	}
 
-	if (ocr & MMC_VDD_165_195) {
+	if ((ocr & MMC_VDD_165_195) &&
+	    !(host->ocr_avail_sd & MMC_VDD_165_195)) {
 		printk(KERN_WARNING "%s: SD card claims to support the "
 		       "incompletely defined 'low voltage range'. This "
 		       "will be ignored.\n", mmc_hostname(host));
diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
index efef5f94ac42..c18810ab6465 100644
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -700,6 +700,8 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
 	WARN_ON(!host->claimed);
 
 	mmc_attach_bus(host, &mmc_sdio_ops);
+	if (host->ocr_avail_sdio)
+		host->ocr_avail = host->ocr_avail_sdio;
 
 	/*
 	 * Sanity check the voltages that the card claims to