linux-kernel - [PATCH] mmc: bus: Log bus width info when attaching card

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Date:   Wed, 8 Dec 2021 13:02:25 +0000
From:   Christian Löhle <CLoehle@...erstone.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Christian Löhle <CLoehle@...erstone.com>
CC:     "johan@...nel.org" <johan@...nel.org>,
        "sudeep.holla@....com" <sudeep.holla@....com>,
        "linux@...inikbrodowski.net" <linux@...inikbrodowski.net>
Subject: [PATCH] mmc: bus: Log bus width info when attaching card

Add info about bus width of the attached card to the bring-up message

For both MMC and SD cards the bus width that is used might
not be obvious to a user. For MMC this might be 1, 4 or 8,
for SD only 1 and 4. In both cases this would be a restriction
by the host (setup). Like using an MMC in an SD slot or an
eMMC to SD adapter.

Signed-off-by: Christian Loehle <cloehle@...erstone.com>
---
 drivers/mmc/core/bus.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index f6b7a9c5bbff..71a675dcd9b7 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -358,7 +358,7 @@ int mmc_add_card(struct mmc_card *card)
 			mmc_card_ddr52(card) ? "DDR " : "",
 			type);
 	} else {
-		pr_info("%s: new %s%s%s%s%s%s card at address %04x\n",
+		pr_info("%s: new %s%s%s%s%s%s %u-bit card at address %04x\n",
 			mmc_hostname(card->host),
 			mmc_card_uhs(card) ? "ultra high speed " :
 			(mmc_card_hs(card) ? "high speed " : ""),
@@ -366,7 +366,8 @@ int mmc_add_card(struct mmc_card *card)
 			(mmc_card_hs200(card) ? "HS200 " : ""),
 			mmc_card_hs400es(card) ? "Enhanced strobe " : "",
 			mmc_card_ddr52(card) ? "DDR " : "",
-			uhs_bus_speed_mode, type, card->rca);
+			uhs_bus_speed_mode, type,
+			1<<card->host->ios.bus_width, card->rca);
 	}
 
 #ifdef CONFIG_DEBUG_FS
-- 
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