From: yong mao <yong.mao@xxxxxxxxxxxx> CMD response CRC error may cause cannot boot up Change to use data tune for CMD line Separate cmd internal delay for HS200/HS400 mode Signed-off-by: Yong Mao <yong.mao@xxxxxxxxxxxx> Signed-off-by: Chaotian Jing <chaotian.jing@xxxxxxxxxxxx> --- arch/arm64/boot/dts/mediatek/mt8173-evb.dts | 3 + drivers/mmc/host/mtk-sd.c | 169 +++++++++++++++++++++++---- 2 files changed, 149 insertions(+), 23 deletions(-) diff --git a/arch/arm64/boot/dts/mediatek/mt8173-evb.dts b/arch/arm64/boot/dts/mediatek/mt8173-evb.dts index 0ecaad4..29c3100 100644 --- a/arch/arm64/boot/dts/mediatek/mt8173-evb.dts +++ b/arch/arm64/boot/dts/mediatek/mt8173-evb.dts @@ -134,6 +134,9 @@ bus-width = <8>; max-frequency = <50000000>; cap-mmc-highspeed; + hs200-cmd-int-delay = <26>; + hs400-cmd-int-delay = <14>; + cmd-resp-sel = <0>; /* 0: rising, 1: falling */ vmmc-supply = <&mt6397_vemc_3v3_reg>; vqmmc-supply = <&mt6397_vio18_reg>; non-removable; diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c index 80ba034..93eb395 100644 --- a/drivers/mmc/host/mtk-sd.c +++ b/drivers/mmc/host/mtk-sd.c @@ -75,6 +75,7 @@ #define MSDC_PATCH_BIT1 0xb4 #define MSDC_PAD_TUNE 0xec #define PAD_DS_TUNE 0x188 +#define PAD_CMD_TUNE 0x18c #define EMMC50_CFG0 0x208 /*--------------------------------------------------------------------------*/ @@ -210,12 +211,17 @@ #define MSDC_PATCH_BIT_SPCPUSH (0x1 << 29) /* RW */ #define MSDC_PATCH_BIT_DECRCTMO (0x1 << 30) /* RW */ -#define MSDC_PAD_TUNE_DATRRDLY (0x1f << 8) /* RW */ -#define MSDC_PAD_TUNE_CMDRDLY (0x1f << 16) /* RW */ +#define MSDC_PAD_TUNE_DATWRDLY (0x1f << 0) /* RW */ +#define MSDC_PAD_TUNE_DATRRDLY (0x1f << 8) /* RW */ +#define MSDC_PAD_TUNE_CMDRDLY (0x1f << 16) /* RW */ +#define MSDC_PAD_TUNE_CMDRRDLY (0x1f << 22) /* RW */ +#define MSDC_PAD_TUNE_CLKTDLY (0x1f << 27) /* RW */ -#define PAD_DS_TUNE_DLY1 (0x1f << 2) /* RW */ -#define PAD_DS_TUNE_DLY2 (0x1f << 7) /* RW */ -#define PAD_DS_TUNE_DLY3 (0x1f << 12) /* RW */ +#define PAD_DS_TUNE_DLY1 (0x1f << 2) /* RW */ +#define PAD_DS_TUNE_DLY2 (0x1f << 7) /* RW */ +#define PAD_DS_TUNE_DLY3 (0x1f << 12) /* RW */ + +#define PAD_CMD_TUNE_RX_DLY3 (0x1f << 1) /* RW */ #define EMMC50_CFG_PADCMD_LATCHCK (0x1 << 0) /* RW */ #define EMMC50_CFG_CRCSTS_EDGE (0x1 << 3) /* RW */ @@ -236,7 +242,9 @@ #define CMD_TIMEOUT (HZ/10 * 5) /* 100ms x5 */ #define DAT_TIMEOUT (HZ * 5) /* 1000ms x5 */ -#define PAD_DELAY_MAX 32 /* PAD delay cells */ +#define PAD_DELAY_MAX 32 /* PAD delay cells */ +#define ENOUGH_MARGIN_MIN 12 /* Enough Margin */ +#define PREFER_START_POS_MAX 4 /* Prefer start position */ /*--------------------------------------------------------------------------*/ /* Descriptor Structure */ /*--------------------------------------------------------------------------*/ @@ -284,12 +292,14 @@ struct msdc_save_para { u32 patch_bit0; u32 patch_bit1; u32 pad_ds_tune; + u32 pad_cmd_tune; u32 emmc50_cfg0; }; struct msdc_tune_para { u32 iocon; u32 pad_tune; + u32 pad_cmd_tune; }; struct msdc_delay_phase { @@ -331,6 +341,9 @@ struct msdc_host { unsigned char timing; bool vqmmc_enabled; u32 hs400_ds_delay; + u32 hs200_cmd_int_delay; /* cmd internal delay for HS200/SDR104 */ + u32 hs400_cmd_int_delay; /* cmd internal delay for HS400 */ + u32 hs200_cmd_resp_sel; /* cmd response sample selection */ bool hs400_mode; /* current eMMC will run at hs400 mode */ struct msdc_save_para save_para; /* used when gate HCLK */ struct msdc_tune_para def_tune_para; /* default tune setting */ @@ -596,12 +609,21 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz) */ if (host->sclk <= 52000000) { writel(host->def_tune_para.iocon, host->base + MSDC_IOCON); - writel(host->def_tune_para.pad_tune, host->base + MSDC_PAD_TUNE); + writel(host->def_tune_para.pad_tune, + host->base + MSDC_PAD_TUNE); } else { - writel(host->saved_tune_para.iocon, host->base + MSDC_IOCON); - writel(host->saved_tune_para.pad_tune, host->base + MSDC_PAD_TUNE); + writel(host->saved_tune_para.iocon, + host->base + MSDC_IOCON); + writel(host->saved_tune_para.pad_tune, + host->base + MSDC_PAD_TUNE); + writel(host->saved_tune_para.pad_cmd_tune, + host->base + PAD_CMD_TUNE); } + if (timing == MMC_TIMING_MMC_HS400) + sdr_set_field(host->base + PAD_CMD_TUNE, + MSDC_PAD_TUNE_CMDRRDLY, + host->hs400_cmd_int_delay); dev_dbg(host->dev, "sclk: %d, timing: %d\n", host->sclk, timing); } @@ -1302,7 +1324,8 @@ static struct msdc_delay_phase get_best_delay(struct msdc_host *host, u32 delay) len_final = len; } start += len ? len : 1; - if (len >= 8 && start_final < 4) + if (len >= ENOUGH_MARGIN_MIN && + start_final < PREFER_START_POS_MAX) break; } @@ -1325,48 +1348,128 @@ static int msdc_tune_response(struct mmc_host *mmc, u32 opcode) struct msdc_host *host = mmc_priv(mmc); u32 rise_delay = 0, fall_delay = 0; struct msdc_delay_phase final_rise_delay, final_fall_delay = { 0,}; + struct msdc_delay_phase internal_delay_phase; u8 final_delay, final_maxlen; + u32 internal_delay = 0; int cmd_err; - int i; + int i, j; + if (mmc->ios.timing == MMC_TIMING_MMC_HS200 || + mmc->ios.timing == MMC_TIMING_UHS_SDR104) + sdr_set_field(host->base + MSDC_PAD_TUNE, + MSDC_PAD_TUNE_CMDRRDLY, + host->hs200_cmd_int_delay); sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL); for (i = 0 ; i < PAD_DELAY_MAX; i++) { sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRDLY, i); - mmc_send_tuning(mmc, opcode, &cmd_err); - if (!cmd_err) - rise_delay |= (1 << i); + for (j = 0; j < 3; j++) { + mmc_send_tuning(mmc, opcode, &cmd_err); + if (!cmd_err) { + rise_delay |= (1 << i); + } else { + rise_delay &= ~(1 << i); + break; + } + } } final_rise_delay = get_best_delay(host, rise_delay); /* if rising edge has enough margin, then do not scan falling edge */ - if (final_rise_delay.maxlen >= 10 || - (final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4)) + if (final_rise_delay.maxlen >= ENOUGH_MARGIN_MIN && + final_rise_delay.start < PREFER_START_POS_MAX) goto skip_fall; sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL); for (i = 0; i < PAD_DELAY_MAX; i++) { sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRDLY, i); - mmc_send_tuning(mmc, opcode, &cmd_err); - if (!cmd_err) - fall_delay |= (1 << i); + for (j = 0; j < 3; j++) { + mmc_send_tuning(mmc, opcode, &cmd_err); + if (!cmd_err) { + fall_delay |= (1 << i); + } else { + fall_delay &= ~(1 << i); + break; + }; + } } final_fall_delay = get_best_delay(host, fall_delay); skip_fall: final_maxlen = max(final_rise_delay.maxlen, final_fall_delay.maxlen); + if (final_fall_delay.maxlen >= ENOUGH_MARGIN_MIN && + final_fall_delay.start < PREFER_START_POS_MAX) + final_maxlen = final_fall_delay.maxlen; if (final_maxlen == final_rise_delay.maxlen) { sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL); - sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRDLY, + sdr_set_field(host->base + MSDC_PAD_TUNE, + MSDC_PAD_TUNE_CMDRDLY, final_rise_delay.final_phase); final_delay = final_rise_delay.final_phase; } else { sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL); - sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRDLY, + sdr_set_field(host->base + MSDC_PAD_TUNE, + MSDC_PAD_TUNE_CMDRDLY, final_fall_delay.final_phase); final_delay = final_fall_delay.final_phase; } + if (host->hs200_cmd_int_delay) + goto skip_internal; + for (i = 0; i < PAD_DELAY_MAX; i++) { + sdr_set_field(host->base + MSDC_PAD_TUNE, + MSDC_PAD_TUNE_CMDRRDLY, i); + mmc_send_tuning(mmc, opcode, &cmd_err); + if (!cmd_err) + internal_delay |= (1 << i); + } + dev_info(host->dev, "Final internal delay: 0x%x\n", internal_delay); + internal_delay_phase = get_best_delay(host, internal_delay); + sdr_set_field(host->base + MSDC_PAD_TUNE, MSDC_PAD_TUNE_CMDRRDLY, + internal_delay_phase.final_phase); +skip_internal: + dev_info(host->dev, "Final cmd pad delay: %x\n", final_delay); + return final_delay == 0xff ? -EIO : 0; +} + +static int hs400_tune_response(struct mmc_host *mmc, u32 opcode) +{ + struct msdc_host *host = mmc_priv(mmc); + u32 cmd_delay = 0; + struct msdc_delay_phase final_cmd_delay = { 0,}; + u8 final_delay; + int cmd_err; + int i, j; + + /* select EMMC50 PAD CMD tune */ + sdr_set_bits(host->base + PAD_CMD_TUNE, BIT(0)); + + if (mmc->ios.timing == MMC_TIMING_MMC_HS200 || + mmc->ios.timing == MMC_TIMING_UHS_SDR104) + sdr_set_field(host->base + MSDC_PAD_TUNE, + MSDC_PAD_TUNE_CMDRRDLY, + host->hs200_cmd_int_delay); + sdr_set_field(host->base + MSDC_IOCON, MSDC_IOCON_RSPL, + host->hs200_cmd_resp_sel); + for (i = 0 ; i < PAD_DELAY_MAX; i++) { + sdr_set_field(host->base + PAD_CMD_TUNE, + PAD_CMD_TUNE_RX_DLY3, i); + for (j = 0; j < 3; j++) { + mmc_send_tuning(mmc, opcode, &cmd_err); + if (!cmd_err) { + cmd_delay |= (1 << i); + } else { + cmd_delay &= ~(1 << i); + break; + } + } + } + final_cmd_delay = get_best_delay(host, cmd_delay); + sdr_set_field(host->base + PAD_CMD_TUNE, PAD_CMD_TUNE_RX_DLY3, + final_cmd_delay.final_phase); + final_delay = final_cmd_delay.final_phase; + + dev_info(host->dev, "Final cmd pad delay: %x\n", final_delay); return final_delay == 0xff ? -EIO : 0; } @@ -1389,7 +1492,7 @@ static int msdc_tune_data(struct mmc_host *mmc, u32 opcode) } final_rise_delay = get_best_delay(host, rise_delay); /* if rising edge has enough margin, then do not scan falling edge */ - if (final_rise_delay.maxlen >= 10 || + if (final_rise_delay.maxlen >= ENOUGH_MARGIN_MIN || (final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4)) goto skip_fall; @@ -1422,6 +1525,7 @@ static int msdc_tune_data(struct mmc_host *mmc, u32 opcode) final_delay = final_fall_delay.final_phase; } + dev_info(host->dev, "Final data pad delay: %x\n", final_delay); return final_delay == 0xff ? -EIO : 0; } @@ -1430,10 +1534,13 @@ static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode) struct msdc_host *host = mmc_priv(mmc); int ret; + if (host->hs400_mode) + ret = hs400_tune_response(mmc, opcode); + else ret = msdc_tune_response(mmc, opcode); if (ret == -EIO) { dev_err(host->dev, "Tune response fail!\n"); - return ret; + goto out; } if (host->hs400_mode == false) { ret = msdc_tune_data(mmc, opcode); @@ -1443,6 +1550,8 @@ static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode) host->saved_tune_para.iocon = readl(host->base + MSDC_IOCON); host->saved_tune_para.pad_tune = readl(host->base + MSDC_PAD_TUNE); + host->saved_tune_para.pad_cmd_tune = readl(host->base + PAD_CMD_TUNE); +out: return ret; } @@ -1553,6 +1662,18 @@ static int msdc_drv_probe(struct platform_device *pdev) dev_dbg(&pdev->dev, "hs400-ds-delay: %x\n", host->hs400_ds_delay); + if (!of_property_read_u32(pdev->dev.of_node, "hs200-cmd-int-delay", + &host->hs200_cmd_int_delay)) + dev_dbg(&pdev->dev, "host->hs200-cmd-int-delay: %x\n", + host->hs200_cmd_int_delay); + if (!of_property_read_u32(pdev->dev.of_node, "hs400-cmd-int-delay", + &host->hs400_cmd_int_delay)) + dev_dbg(&pdev->dev, "host->hs400-cmd-int-delay: %x\n", + host->hs400_cmd_int_delay); + if (!of_property_read_u32(pdev->dev.of_node, "cmd-resp-sel", + &host->hs200_cmd_resp_sel)) + dev_dbg(&pdev->dev, "host->hs200_cmd-resp-sel: %x\n", + host->hs200_cmd_resp_sel); host->dev = &pdev->dev; host->mmc = mmc; host->src_clk_freq = clk_get_rate(host->src_clk); @@ -1663,6 +1784,7 @@ static void msdc_save_reg(struct msdc_host *host) host->save_para.patch_bit0 = readl(host->base + MSDC_PATCH_BIT); host->save_para.patch_bit1 = readl(host->base + MSDC_PATCH_BIT1); host->save_para.pad_ds_tune = readl(host->base + PAD_DS_TUNE); + host->save_para.pad_cmd_tune = readl(host->base + PAD_CMD_TUNE); host->save_para.emmc50_cfg0 = readl(host->base + EMMC50_CFG0); } @@ -1675,6 +1797,7 @@ static void msdc_restore_reg(struct msdc_host *host) writel(host->save_para.patch_bit0, host->base + MSDC_PATCH_BIT); writel(host->save_para.patch_bit1, host->base + MSDC_PATCH_BIT1); writel(host->save_para.pad_ds_tune, host->base + PAD_DS_TUNE); + writel(host->save_para.pad_cmd_tune, host->base + PAD_CMD_TUNE); writel(host->save_para.emmc50_cfg0, host->base + EMMC50_CFG0); } -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html