[PATCHv5 1/5] mmc: meson-gx: Fix clk phase tuning for MMC

[Anand Moon]

As per mainline line kernel fix the clk tuning phase for mmc,
set Core=180, Tx=180, Rx=0 clk phase for mmc initialization.
As per S905, S905X, AGX and S922X datasheet set the default
values for clk tuning.

Signed-off-by: Anand Moon <linux.amoon at gmail.com>
---
 arch/arm/include/asm/arch-meson/sd_emmc.h | 28 ++++++++++++------
 drivers/mmc/meson_gx_mmc.c                | 36 +++++++++++++++++++----
 2 files changed, 50 insertions(+), 14 deletions(-)

diff --git a/arch/arm/include/asm/arch-meson/sd_emmc.h b/arch/arm/include/asm/arch-meson/sd_emmc.h
index e3a72c8b66..b7a99947b3 100644
--- a/arch/arm/include/asm/arch-meson/sd_emmc.h
+++ b/arch/arm/include/asm/arch-meson/sd_emmc.h
@@ -7,6 +7,7 @@
 #define __SD_EMMC_H__
 
 #include <mmc.h>
+#include <linux/bitops.h>
 
 #define SDIO_PORT_A			0
 #define SDIO_PORT_B			1
@@ -19,15 +20,24 @@
 #define   CLK_MAX_DIV			63
 #define   CLK_SRC_24M			(0 << 6)
 #define   CLK_SRC_DIV2			(1 << 6)
-#define   CLK_CO_PHASE_000		(0 << 8)
-#define   CLK_CO_PHASE_090		(1 << 8)
-#define   CLK_CO_PHASE_180		(2 << 8)
-#define   CLK_CO_PHASE_270		(3 << 8)
-#define   CLK_TX_PHASE_000		(0 << 10)
-#define   CLK_TX_PHASE_090		(1 << 10)
-#define   CLK_TX_PHASE_180		(2 << 10)
-#define   CLK_TX_PHASE_270		(3 << 10)
-#define   CLK_ALWAYS_ON			BIT(24)
+
+#define   CRYSTAL_24MHZ			0
+#define   CLK_PHASE_0			0
+#define   CLK_PHASE_180			2
+
+#define   CLK_DIV_MASK			GENMASK(5, 0)
+#define   CLK_SRC_MASK			GENMASK(7, 6)
+#define   CLK_CORE_PHASE_MASK		GENMASK(9, 8)
+#define   CLK_TX_PHASE_MASK		GENMASK(11, 10)
+#define   CLK_RX_PHASE_MASK		GENMASK(13, 12)
+
+#define   CLK_V2_TX_DELAY_MASK		GENMASK(19, 16)
+#define   CLK_V2_RX_DELAY_MASK		GENMASK(23, 20)
+#define   CLK_V2_ALWAYS_ON		BIT(24)
+
+#define   CLK_V3_TX_DELAY_MASK		GENMASK(21, 16)
+#define   CLK_V3_RX_DELAY_MASK		GENMASK(27, 22)
+#define   CLK_V3_ALWAYS_ON		BIT(28)
 
 #define MESON_SD_EMMC_CFG		0x44
 #define   CFG_BUS_WIDTH_MASK		GENMASK(1, 0)
diff --git a/drivers/mmc/meson_gx_mmc.c b/drivers/mmc/meson_gx_mmc.c
index 86c1a7164a..03fb70e717 100644
--- a/drivers/mmc/meson_gx_mmc.c
+++ b/drivers/mmc/meson_gx_mmc.c
@@ -16,6 +16,10 @@
 #include <asm/arch/sd_emmc.h>
 #include <linux/log2.h>
 
+#include <linux/bitops.h>
+#include <linux/compat.h>
+#include <linux/bitfield.h>
+
 static inline void *get_regbase(const struct mmc *mmc)
 {
 	struct meson_mmc_platdata *pdata = mmc->priv;
@@ -51,11 +55,33 @@ static void meson_mmc_config_clock(struct mmc *mmc)
 	}
 	clk_div = DIV_ROUND_UP(clk, mmc->clock);
 
-	/* 180 phase core clock */
-	meson_mmc_clk |= CLK_CO_PHASE_180;
-
-	/* 180 phase tx clock */
-	meson_mmc_clk |= CLK_TX_PHASE_000;
+	/* Clock divider */
+	meson_mmc_clk |= CLK_DIV_MASK;
+	/* Clock source : Crystal 24MHz */
+	meson_mmc_clk |= FIELD_PREP(CLK_SRC_MASK, CRYSTAL_24MHZ);
+	/* Core clock phase 2:180 */
+	meson_mmc_clk |= FIELD_PREP(CLK_CORE_PHASE_MASK, CLK_PHASE_180);
+	/* TX clock phase 2:180 */
+	meson_mmc_clk |= FIELD_PREP(CLK_TX_PHASE_MASK, CLK_PHASE_180);
+	/* RX clock phase 0:180 */
+	meson_mmc_clk |= FIELD_PREP(CLK_RX_PHASE_MASK, CLK_PHASE_0);
+
+#ifdef CONFIG_MESON_GX
+	/* TX clock delay line */
+	meson_mmc_clk |= CLK_V2_TX_DELAY_MASK;
+	/* RX clock delay line */
+	meson_mmc_clk |= CLK_V2_RX_DELAY_MASK;
+	/* clk always on */
+	meson_mmc_clk |= CLK_V2_ALWAYS_ON;
+#endif
+#if (defined(CONFIG_MESON_AXG) || defined(CONFIG_MESON_G12A))
+	/* TX clock delay line */
+	meson_mmc_clk |= CLK_V3_TX_DELAY_MASK;
+	/* RX clock delay line */
+	meson_mmc_clk |= CLK_V3_RX_DELAY_MASK;
+	/* clk always on */
+	meson_mmc_clk |= CLK_V3_ALWAYS_ON;
+#endif
 
 	/* clock settings */
 	meson_mmc_clk |= clk_src;
-- 
2.25.0