linux-kernel - [RESEND v4 2/3] mmc: core: add tuning support for HS400 mode

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Date:   Fri, 17 Sep 2021 20:48:02 +0800
From:   Wenbin Mei <wenbin.mei@...iatek.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     Chaotian Jing <chaotian.jing@...iatek.com>,
        Avri Altman <avri.altman@....com>,
        Wenbin Mei <wenbin.mei@...iatek.com>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Yue Hu <huyue2@...ong.com>, Bean Huo <beanhuo@...ron.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        <linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [RESEND v4 2/3] mmc: core: add tuning support for HS400 mode

This adds the execute_hs400_tuning callback function for HS400 tuning
operations and move the declaration of mmc_get_ext_csd() to
include/linux/mmc/host.h.

If execute_hs400_tuning is not implemented then they are not called.
That means there should be no affect for existing drivers as none implemt
these ops.

Signed-off-by: Wenbin Mei <wenbin.mei@...iatek.com>
---
 drivers/mmc/core/mmc.c     | 8 ++++++++
 drivers/mmc/core/mmc_ops.h | 1 -
 include/linux/mmc/host.h   | 4 ++++
 3 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 838726b68ff3..0aa72acd8612 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -1222,6 +1222,14 @@ static int mmc_select_hs400(struct mmc_card *card)
 	mmc_set_timing(host, MMC_TIMING_MMC_HS400);
 	mmc_set_bus_speed(card);
 
+	if (host->ops->execute_hs400_tuning) {
+		mmc_retune_disable(host);
+		err = host->ops->execute_hs400_tuning(host, card);
+		mmc_retune_enable(host);
+		if (err)
+			goto out_err;
+	}
+
 	if (host->ops->hs400_complete)
 		host->ops->hs400_complete(host);
 
diff --git a/drivers/mmc/core/mmc_ops.h b/drivers/mmc/core/mmc_ops.h
index ae25ffc2e870..e5e94567a9a9 100644
--- a/drivers/mmc/core/mmc_ops.h
+++ b/drivers/mmc/core/mmc_ops.h
@@ -38,7 +38,6 @@ int mmc_spi_read_ocr(struct mmc_host *host, int highcap, u32 *ocrp);
 int mmc_spi_set_crc(struct mmc_host *host, int use_crc);
 int mmc_bus_test(struct mmc_card *card, u8 bus_width);
 int mmc_can_ext_csd(struct mmc_card *card);
-int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd);
 int mmc_switch_status(struct mmc_card *card, bool crc_err_fatal);
 bool mmc_prepare_busy_cmd(struct mmc_host *host, struct mmc_command *cmd,
 			  unsigned int timeout_ms);
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index ff1a251bb0bc..072650aeb2a7 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -162,6 +162,9 @@ struct mmc_host_ops {
 	/* Prepare HS400 target operating frequency depending host driver */
 	int	(*prepare_hs400_tuning)(struct mmc_host *host, struct mmc_ios *ios);
 
+	/* Execute HS400 tuning depending host driver */
+	int	(*execute_hs400_tuning)(struct mmc_host *host, struct mmc_card *card);
+
 	/* Prepare switch to DDR during the HS400 init sequence */
 	int	(*hs400_prepare_ddr)(struct mmc_host *host);
 
@@ -633,5 +636,6 @@ static inline enum dma_data_direction mmc_get_dma_dir(struct mmc_data *data)
 
 int mmc_send_tuning(struct mmc_host *host, u32 opcode, int *cmd_error);
 int mmc_send_abort_tuning(struct mmc_host *host, u32 opcode);
+int mmc_get_ext_csd(struct mmc_card *card, u8 **new_ext_csd);
 
 #endif /* LINUX_MMC_HOST_H */
-- 
2.25.1