linux-kernel - [RFC PATCH v3.2 05/29] mmc: core: UHS-II support, skip TMODE setup in some cases

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Message-Id: <20210722040124.7573-5-jasonlai.genesyslogic@gmail.com>
Date:   Thu, 22 Jul 2021 12:01:00 +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 05/29] mmc: core: UHS-II support, skip TMODE setup in some cases

UHS-II's data command packet has TMODE fields in which parameters for
data transaction, like Duplex Mode(DM) and Length Mode(LM), are specified.
In some cases, we don't need to initialize them and so set uhs2_tmode0_flag
to 1 in order to skip them in generating a packet.
(The code will be added in the next commit.)

Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
Signed-off-by: AKASHI Takahiro <takahiro.akashi@...aro.org>
---
 drivers/mmc/core/block.c  | 7 ++++++-
 drivers/mmc/core/sd_ops.c | 3 +++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 689eb9afeeed..d107578cdbff 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -57,6 +57,7 @@
 #include "mmc_ops.h"
 #include "quirks.h"
 #include "sd_ops.h"
+#include "uhs2.h"

 MODULE_ALIAS("mmc:block");
 #ifdef MODULE_PARAM_PREFIX
@@ -1538,6 +1539,9 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
 	struct request *req = mmc_queue_req_to_req(mqrq);
 	struct mmc_blk_data *md = mq->blkdata;
 	bool do_rel_wr, do_data_tag;
+	bool do_multi;
+
+	do_multi = (card->host->flags & MMC_UHS2_INITIALIZED) ? true : false;

 	mmc_blk_data_prep(mq, mqrq, disable_multi, &do_rel_wr, &do_data_tag);

@@ -1548,7 +1552,7 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
 		brq->cmd.arg <<= 9;
 	brq->cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;

-	if (brq->data.blocks > 1 || do_rel_wr) {
+	if (brq->data.blocks > 1 || do_rel_wr || do_multi) {
 		/* SPI multiblock writes terminate using a special
 		 * token, not a STOP_TRANSMISSION request.
 		 */
@@ -1561,6 +1565,7 @@ static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
 		brq->mrq.stop = NULL;
 		readcmd = MMC_READ_SINGLE_BLOCK;
 		writecmd = MMC_WRITE_BLOCK;
+		brq->cmd.uhs2_tmode0_flag = 1;
 	}
 	brq->cmd.opcode = rq_data_dir(req) == READ ? readcmd : writecmd;

diff --git a/drivers/mmc/core/sd_ops.c b/drivers/mmc/core/sd_ops.c
index d61ff811218c..baa05a6a36c4 100644
--- a/drivers/mmc/core/sd_ops.c
+++ b/drivers/mmc/core/sd_ops.c
@@ -280,6 +280,7 @@ int mmc_app_send_scr(struct mmc_card *card)
 	cmd.opcode = SD_APP_SEND_SCR;
 	cmd.arg = 0;
 	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+	cmd.uhs2_tmode0_flag = 1;

 	data.blksz = 8;
 	data.blocks = 1;
@@ -327,6 +328,7 @@ int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 	cmd.arg &= ~(0xF << (group * 4));
 	cmd.arg |= value << (group * 4);
 	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
+	cmd.uhs2_tmode0_flag = 1;

 	data.blksz = 64;
 	data.blocks = 1;
@@ -368,6 +370,7 @@ int mmc_app_sd_status(struct mmc_card *card, void *ssr)
 	cmd.opcode = SD_APP_SD_STATUS;
 	cmd.arg = 0;
 	cmd.flags = MMC_RSP_SPI_R2 | MMC_RSP_R1 | MMC_CMD_ADTC;
+	cmd.uhs2_tmode0_flag = 1;

 	data.blksz = 64;
 	data.blocks = 1;
--
2.32.0