From c2c09678f849cec54a4783fde8db9ea2e5be7585 Mon Sep 17 00:00:00 2001 From: Aapo Vienamo Date: Thu, 30 Aug 2018 18:06:22 +0300 Subject: [PATCH] mmc: tegra: Configure default tap values Set the default inbound timing adjustment tap value on reset and on non-tunable modes. The default tap value is not programmed on tunable modes because the tuning sequence is used instead to determine the tap value. Signed-off-by: Aapo Vienamo Acked-by: Thierry Reding Acked-by: Adrian Hunter Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci-tegra.c | 132 ++++++++++++++++++++++++----------------- 1 file changed, 77 insertions(+), 55 deletions(-) diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c index dd8cb3f3cecc..3fd54af05671 100644 --- a/drivers/mmc/host/sdhci-tegra.c +++ b/drivers/mmc/host/sdhci-tegra.c @@ -213,6 +213,58 @@ static bool tegra_sdhci_is_pad_and_regulator_valid(struct sdhci_host *host) return true; } +static bool tegra_sdhci_configure_card_clk(struct sdhci_host *host, bool enable) +{ + bool status; + u32 reg; + + reg = sdhci_readw(host, SDHCI_CLOCK_CONTROL); + status = !!(reg & SDHCI_CLOCK_CARD_EN); + + if (status == enable) + return status; + + if (enable) + reg |= SDHCI_CLOCK_CARD_EN; + else + reg &= ~SDHCI_CLOCK_CARD_EN; + + sdhci_writew(host, reg, SDHCI_CLOCK_CONTROL); + + return status; +} + + +static void tegra_sdhci_set_tap(struct sdhci_host *host, unsigned int tap) +{ + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); + struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); + const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; + bool card_clk_enabled = false; + u32 reg; + + /* + * Touching the tap values is a bit tricky on some SoC generations. + * The quirk enables a workaround for a glitch that sometimes occurs if + * the tap values are changed. + */ + + if (soc_data->nvquirks & NVQUIRK_DIS_CARD_CLK_CONFIG_TAP) + card_clk_enabled = tegra_sdhci_configure_card_clk(host, false); + + reg = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); + reg &= ~SDHCI_CLOCK_CTRL_TAP_MASK; + reg |= tap << SDHCI_CLOCK_CTRL_TAP_SHIFT; + sdhci_writel(host, reg, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); + + if (soc_data->nvquirks & NVQUIRK_DIS_CARD_CLK_CONFIG_TAP && + card_clk_enabled) { + udelay(1); + sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); + tegra_sdhci_configure_card_clk(host, card_clk_enabled); + } +} + static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); @@ -225,6 +277,8 @@ static void tegra_sdhci_reset(struct sdhci_host *host, u8 mask) if (!(mask & SDHCI_RESET_ALL)) return; + tegra_sdhci_set_tap(host, tegra_host->default_tap); + misc_ctrl = sdhci_readl(host, SDHCI_TEGRA_VENDOR_MISC_CTRL); clk_ctrl = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); @@ -286,27 +340,6 @@ static void tegra_sdhci_configure_cal_pad(struct sdhci_host *host, bool enable) usleep_range(1, 2); } -static bool tegra_sdhci_configure_card_clk(struct sdhci_host *host, bool enable) -{ - bool status; - u32 reg; - - reg = sdhci_readw(host, SDHCI_CLOCK_CONTROL); - status = !!(reg & SDHCI_CLOCK_CARD_EN); - - if (status == enable) - return status; - - if (enable) - reg |= SDHCI_CLOCK_CARD_EN; - else - reg &= ~SDHCI_CLOCK_CARD_EN; - - sdhci_writew(host, reg, SDHCI_CLOCK_CONTROL); - - return status; -} - static void tegra_sdhci_set_pad_autocal_offset(struct sdhci_host *host, u16 pdpu) { @@ -517,19 +550,6 @@ static void tegra_sdhci_set_clock(struct sdhci_host *host, unsigned int clock) } } -static void tegra_sdhci_set_uhs_signaling(struct sdhci_host *host, - unsigned timing) -{ - struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); - struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); - - if (timing == MMC_TIMING_UHS_DDR50 || - timing == MMC_TIMING_MMC_DDR52) - tegra_host->ddr_signaling = true; - - sdhci_set_uhs_signaling(host, timing); -} - static unsigned int tegra_sdhci_get_max_clock(struct sdhci_host *host) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); @@ -537,34 +557,36 @@ static unsigned int tegra_sdhci_get_max_clock(struct sdhci_host *host) return clk_round_rate(pltfm_host->clk, UINT_MAX); } -static void tegra_sdhci_set_tap(struct sdhci_host *host, unsigned int tap) +static void tegra_sdhci_set_uhs_signaling(struct sdhci_host *host, + unsigned timing) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_tegra *tegra_host = sdhci_pltfm_priv(pltfm_host); - const struct sdhci_tegra_soc_data *soc_data = tegra_host->soc_data; - bool card_clk_enabled = false; - u32 reg; + bool set_default_tap = false; - /* - * Touching the tap values is a bit tricky on some SoC generations. - * The quirk enables a workaround for a glitch that sometimes occurs if - * the tap values are changed. - */ + switch (timing) { + case MMC_TIMING_UHS_SDR50: + case MMC_TIMING_UHS_SDR104: + case MMC_TIMING_MMC_HS200: + case MMC_TIMING_MMC_HS400: + /* Don't set default tap on tunable modes. */ + break; + case MMC_TIMING_MMC_DDR52: + case MMC_TIMING_UHS_DDR50: + tegra_host->ddr_signaling = true; + set_default_tap = true; + break; + default: + set_default_tap = true; + break; + } - if (soc_data->nvquirks & NVQUIRK_DIS_CARD_CLK_CONFIG_TAP) - card_clk_enabled = tegra_sdhci_configure_card_clk(host, false); + sdhci_set_uhs_signaling(host, timing); - reg = sdhci_readl(host, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); - reg &= ~SDHCI_CLOCK_CTRL_TAP_MASK; - reg |= tap << SDHCI_CLOCK_CTRL_TAP_SHIFT; - sdhci_writel(host, reg, SDHCI_TEGRA_VENDOR_CLOCK_CTRL); + tegra_sdhci_pad_autocalib(host); - if (soc_data->nvquirks & NVQUIRK_DIS_CARD_CLK_CONFIG_TAP && - card_clk_enabled) { - usleep_range(1, 2); - sdhci_reset(host, SDHCI_RESET_CMD | SDHCI_RESET_DATA); - tegra_sdhci_configure_card_clk(host, card_clk_enabled); - } + if (set_default_tap) + tegra_sdhci_set_tap(host, tegra_host->default_tap); } static int tegra_sdhci_execute_tuning(struct sdhci_host *host, u32 opcode) -- 2.11.0