linux-kernel - [PATCH v2 2/3] mmc: core: Indicate SD specs higher than 4.0

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Date:   Wed,  6 Feb 2019 13:28:06 +0200
From:   Avri Altman <avri.altman@....com>
To:     Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Avi Shchislowski <avi.shchislowski@....com>,
        Alex Lemberg <alex.lemberg@....com>,
        linux-kernel@...r.kernel.org, Avri Altman <avri.altman@....com>
Subject: [PATCH v2 2/3] mmc: core: Indicate SD specs higher than 4.0

SD specs version 4.x and 5.x have a dedicated slices in the SCR register.
Higher versions will rely on a combination of the existing fields.

Signed-off-by: Avri Altman <avri.altman@....com>
---
 drivers/mmc/core/sd.c    | 5 +++++
 include/linux/mmc/card.h | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index bd48b28..c2db94d 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -209,6 +209,11 @@ static int mmc_decode_scr(struct mmc_card *card)
 		/* Check if Physical Layer Spec v3.0 is supported */
 		scr->sda_spec3 = UNSTUFF_BITS(resp, 47, 1);
 
+	if (scr->sda_spec3) {
+		scr->sda_spec4 = UNSTUFF_BITS(resp, 42, 1);
+		scr->sda_specx = UNSTUFF_BITS(resp, 38, 4);
+	}
+
 	if (UNSTUFF_BITS(resp, 55, 1))
 		card->erased_byte = 0xFF;
 	else
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 8f429b6..d791813f 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -133,6 +133,8 @@ struct mmc_ext_csd {
 struct sd_scr {
 	unsigned char		sda_vsn;
 	unsigned char		sda_spec3;
+	unsigned char		sda_spec4;
+	unsigned char		sda_specx;
 	unsigned char		bus_widths;
 #define SD_SCR_BUS_WIDTH_1	(1<<0)
 #define SD_SCR_BUS_WIDTH_4	(1<<2)
-- 
1.9.1