linux-kernel - [RFC PATCH v3.2 07/29] mmc: core: UHS-II support, set APP

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Date:   Thu, 22 Jul 2021 12:01:02 +0800
From:   Jason Lai <jasonlai.genesyslogic@...il.com>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        ben.chuang@...esyslogic.com.tw, greg.tu@...esyslogic.com.tw,
        jason.lai@...esyslogiv.com.tw,
        AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [RFC PATCH v3.2 07/29] mmc: core: UHS-II support, set APP_CMD bit if necessary

In UHS-II mode, MMC_APP_CMD command need not to be sent.
Instead, APP_CMD bit in a packet should be set.

Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
---
 drivers/mmc/core/sd_ops.c | 9 +++++++++
 drivers/mmc/core/uhs2.c   | 4 ++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c
index baa05a6a36c4..279d676cd5e6 100644
--- a/drivers/mmc/core/sd_ops.c
+++ b/drivers/mmc/core/sd_ops.c
@@ -26,6 +26,15 @@ int mmc_app_cmd(struct mmc_host *host, struct mmc_card *card)
 	if (WARN_ON(card && card->host != host))
 		return -EINVAL;

+	/* UHS2 packet has APP bit so only set APP_CMD flag here.
+	 * Will set the APP bit when assembling UHS2 packet.
+	 */
+	if (host->flags &  MMC_UHS2_SUPPORT &&
+	    host->flags & MMC_UHS2_INITIALIZED) {
+		host->flags |= MMC_UHS2_APP_CMD;
+		return 0;
+	}
+
 	cmd.opcode = MMC_APP_CMD;

 	if (card) {
diff --git a/drivers/mmc/core/uhs2.c b/drivers/mmc/core/uhs2.c
index 1f6d0e0cf355..c0d61e7d9e4b 100644
--- a/drivers/mmc/core/uhs2.c
+++ b/drivers/mmc/core/uhs2.c
@@ -835,6 +835,10 @@ int uhs2_prepare_sd_cmd(struct mmc_host *host, struct mmc_request *mrq)
 		header |= UHS2_PACKET_TYPE_CCMD;

 	arg = cmd->opcode << UHS2_SD_CMD_INDEX_POS;
+	if (host->flags & MMC_UHS2_APP_CMD) {
+		arg |= UHS2_SD_CMD_APP;
+		host->flags &= ~MMC_UHS2_APP_CMD;
+	}

 	uhs2_cmd = cmd->uhs2_cmd;
 	payload = uhs2_cmd->payload;
--
2.32.0