linux-kernel - [PATCH] mmc: sdhci-of-dwcmshc: implement specific set_uhs

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Message-ID: <20200513182602.3636a551@xhacker.debian>
Date:   Wed, 13 May 2020 18:26:02 +0800
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mmc: sdhci-of-dwcmshc: implement specific set_uhs_signaling

We need a different set_uhs_signaling implementation for
MMC_TIMING_MMC_HS and MMC_TIMING_MMC_HS400.

Signed-off-by: Jisheng Zhang <Jisheng.Zhang@...aptics.com>
---
 drivers/mmc/host/sdhci-of-dwcmshc.c | 31 ++++++++++++++++++++++++++++-
 1 file changed, 30 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
index a5137845a1c7..a9ed0e006e06 100644
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -16,6 +16,9 @@
 
 #include "sdhci-pltfm.h"
 
+/* DWCMSHC specific Mode Select value */
+#define DWCMSHC_CTRL_HS400		0x7
+
 #define BOUNDARY_OK(addr, len) \
 	((addr | (SZ_128M - 1)) == ((addr + len - 1) | (SZ_128M - 1)))
 
@@ -46,10 +49,36 @@ static void dwcmshc_adma_write_desc(struct sdhci_host *host, void **desc,
 	sdhci_adma_write_desc(host, desc, addr, len, cmd);
 }
 
+static void dwcmshc_set_uhs_signaling(struct sdhci_host *host,
+				      unsigned int timing)
+{
+	u16 ctrl_2;
+
+	ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+	/* Select Bus Speed Mode for host */
+	ctrl_2 &= ~SDHCI_CTRL_UHS_MASK;
+	if ((timing == MMC_TIMING_MMC_HS200) ||
+	    (timing == MMC_TIMING_UHS_SDR104))
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR104;
+	else if (timing == MMC_TIMING_UHS_SDR12)
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR12;
+	else if ((timing == MMC_TIMING_UHS_SDR25) ||
+		 (timing == MMC_TIMING_MMC_HS))
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR25;
+	else if (timing == MMC_TIMING_UHS_SDR50)
+		ctrl_2 |= SDHCI_CTRL_UHS_SDR50;
+	else if ((timing == MMC_TIMING_UHS_DDR50) ||
+		 (timing == MMC_TIMING_MMC_DDR52))
+		ctrl_2 |= SDHCI_CTRL_UHS_DDR50;
+	else if (timing == MMC_TIMING_MMC_HS400)
+		ctrl_2 |= DWCMSHC_CTRL_HS400;
+	sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
+}
+
 static const struct sdhci_ops sdhci_dwcmshc_ops = {
 	.set_clock		= sdhci_set_clock,
 	.set_bus_width		= sdhci_set_bus_width,
-	.set_uhs_signaling	= sdhci_set_uhs_signaling,
+	.set_uhs_signaling	= dwcmshc_set_uhs_signaling,
 	.get_max_clock		= sdhci_pltfm_clk_get_max_clock,
 	.reset			= sdhci_reset,
 	.adma_write_desc	= dwcmshc_adma_write_desc,
-- 
2.26.2