linux-kernel - [PATCH 5.14 062/172] mmc: renesas_sdhi: fix regression with hard reset on old SDHIs

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Date:   Mon,  4 Oct 2021 14:51:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 5.14 062/172] mmc: renesas_sdhi: fix regression with hard reset on old SDHIs

From: Wolfram Sang <wsa+renesas@...g-engineering.com>

commit b81bede4d138ce62f7342e27bf55ac93c8071818 upstream.

Old SDHI instances have a default value for the reset register which
keeps it in reset state by default. So, when applying a hard reset we
need to manually leave the soft reset state as well. Later SDHI
instances have a different default value, the one we write manually now.

Fixes: b4d86f37eacb ("mmc: renesas_sdhi: do hard reset if possible")
Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>
Reported-by: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20210826082107.47299-1-wsa+renesas@sang-engineering.com
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mmc/host/renesas_sdhi_core.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/mmc/host/renesas_sdhi_core.c
+++ b/drivers/mmc/host/renesas_sdhi_core.c
@@ -582,6 +582,8 @@ static void renesas_sdhi_reset(struct tm
 		/* Unknown why but without polling reset status, it will hang */
 		read_poll_timeout(reset_control_status, ret, ret == 0, 1, 100,
 				  false, priv->rstc);
+		/* At least SDHI_VER_GEN2_SDR50 needs manual release of reset */
+		sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
 		priv->needs_adjust_hs400 = false;
 		renesas_sdhi_set_clock(host, host->clk_cache);
 	} else if (priv->scc_ctl) {