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From: Wolfram Sang <wsa+renesas@sang-engineering.com>
To: linux-mmc@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	Takeshi Saito <takeshi.saito.xv@renesas.com>,
	Wolfram Sang <wsa+renesas@sang-engineering.com>
Subject: [PATCH RFT 1/2] mmc: tmio: restore bus width when resetting
Date: Tue, 16 Mar 2021 09:57:16 +0100	[thread overview]
Message-ID: <20210316085717.7276-2-wsa+renesas@sang-engineering.com> (raw)
In-Reply-To: <20210316085717.7276-1-wsa+renesas@sang-engineering.com>

From: Takeshi Saito <takeshi.saito.xv@renesas.com>

Resetting the IP core will lose the bus width information and not all
code paths recover it. So, make sure the latest bus width gets restored
in the reset routine. For that, tmio_mmc_set_bus_width() is moved, but
not modified.

Signed-off-by: Takeshi Saito <takeshi.saito.xv@renesas.com>
[wsa: reworded commit message]
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/mmc/host/tmio_mmc_core.c | 32 +++++++++++++++++---------------
 1 file changed, 17 insertions(+), 15 deletions(-)

diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index eca767dcabba..3755f606b8db 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -164,6 +164,21 @@ static void tmio_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable)
 	}
 }
 
+static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host,
+				   unsigned char bus_width)
+{
+	u16 reg = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT)
+				& ~(CARD_OPT_WIDTH | CARD_OPT_WIDTH8);
+
+	/* reg now applies to MMC_BUS_WIDTH_4 */
+	if (bus_width == MMC_BUS_WIDTH_1)
+		reg |= CARD_OPT_WIDTH;
+	else if (bus_width == MMC_BUS_WIDTH_8)
+		reg |= CARD_OPT_WIDTH8;
+
+	sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg);
+}
+
 static void tmio_mmc_reset(struct tmio_mmc_host *host)
 {
 	/* FIXME - should we set stop clock reg here */
@@ -177,6 +192,8 @@ static void tmio_mmc_reset(struct tmio_mmc_host *host)
 	if (host->reset)
 		host->reset(host);
 
+	tmio_mmc_set_bus_width(host, host->mmc->ios.bus_width);
+
 	if (host->pdata->flags & TMIO_MMC_SDIO_IRQ) {
 		sd_ctrl_write16(host, CTL_SDIO_IRQ_MASK, host->sdio_irq_mask);
 		sd_ctrl_write16(host, CTL_TRANSACTION_CTL, 0x0001);
@@ -874,21 +891,6 @@ static void tmio_mmc_power_off(struct tmio_mmc_host *host)
 		host->set_pwr(host->pdev, 0);
 }
 
-static void tmio_mmc_set_bus_width(struct tmio_mmc_host *host,
-				   unsigned char bus_width)
-{
-	u16 reg = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT)
-				& ~(CARD_OPT_WIDTH | CARD_OPT_WIDTH8);
-
-	/* reg now applies to MMC_BUS_WIDTH_4 */
-	if (bus_width == MMC_BUS_WIDTH_1)
-		reg |= CARD_OPT_WIDTH;
-	else if (bus_width == MMC_BUS_WIDTH_8)
-		reg |= CARD_OPT_WIDTH8;
-
-	sd_ctrl_write16(host, CTL_SD_MEM_CARD_OPT, reg);
-}
-
 static unsigned int tmio_mmc_get_timeout_cycles(struct tmio_mmc_host *host)
 {
 	u16 val = sd_ctrl_read16(host, CTL_SD_MEM_CARD_OPT);
-- 
2.30.0


  reply	other threads:[~2021-03-16  8:58 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-16  8:57 [PATCH RFT 0/2] mmc: tmio: make resets more robust Wolfram Sang
2021-03-16  8:57 ` Wolfram Sang [this message]
2021-03-16  8:57 ` [PATCH RFT 2/2] mmc: tmio: always flag retune when resetting and a card is present Wolfram Sang
2021-03-23 13:09 ` [PATCH RFT 0/2] mmc: tmio: make resets more robust Yoshihiro Shimoda
2021-03-24 10:20 ` Ulf Hansson

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