From c08bcb6c90068d8eacffdb8b5f77916de5481a72 Mon Sep 17 00:00:00 2001 From: Heiner Kallweit Date: Tue, 4 Apr 2017 21:03:22 +0200 Subject: [PATCH] mmc: meson-gx: introduce struct meson_tuning_params Introduce struct meson_tuning_params for storing the clock phase configurations. There's no functional change because tx and rx clock phase were implicitely set to CLK_PHASE_0 before. Signed-off-by: Heiner Kallweit Signed-off-by: Ulf Hansson --- drivers/mmc/host/meson-gx-mmc.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c index 0036680bad9e..3a6e51c8c5d2 100644 --- a/drivers/mmc/host/meson-gx-mmc.c +++ b/drivers/mmc/host/meson-gx-mmc.c @@ -49,6 +49,8 @@ #define CLK_SRC_PLL 1 /* FCLK_DIV2 */ #define CLK_SRC_PLL_RATE 1000000000 #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_PHASE_0 0 #define CLK_PHASE_90 1 #define CLK_PHASE_180 2 @@ -111,6 +113,12 @@ #define SD_EMMC_CFG_CMD_GAP 16 /* in clock cycles */ #define MUX_CLK_NUM_PARENTS 2 +struct meson_tuning_params { + u8 core_phase; + u8 tx_phase; + u8 rx_phase; +}; + struct meson_host { struct device *dev; struct mmc_host *mmc; @@ -130,6 +138,7 @@ struct meson_host { void *bounce_buf; dma_addr_t bounce_dma_addr; + struct meson_tuning_params tp; bool vqmmc_enabled; }; @@ -312,7 +321,9 @@ static int meson_mmc_clk_init(struct meson_host *host) /* init SD_EMMC_CLOCK to sane defaults w/min clock rate */ clk_reg = 0; - clk_reg |= FIELD_PREP(CLK_CORE_PHASE_MASK, CLK_PHASE_180); + clk_reg |= FIELD_PREP(CLK_CORE_PHASE_MASK, host->tp.core_phase); + clk_reg |= FIELD_PREP(CLK_TX_PHASE_MASK, host->tp.tx_phase); + clk_reg |= FIELD_PREP(CLK_RX_PHASE_MASK, host->tp.rx_phase); clk_reg |= FIELD_PREP(CLK_SRC_MASK, CLK_SRC_XTAL); clk_reg |= FIELD_PREP(CLK_DIV_MASK, CLK_DIV_MAX); clk_reg &= ~CLK_ALWAYS_ON; @@ -757,6 +768,10 @@ static int meson_mmc_probe(struct platform_device *pdev) if (ret) goto free_host; + host->tp.core_phase = CLK_PHASE_180; + host->tp.tx_phase = CLK_PHASE_0; + host->tp.rx_phase = CLK_PHASE_0; + ret = meson_mmc_clk_init(host); if (ret) goto err_core_clk; -- 2.20.1