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Message-ID: <CAPDyKFqquui96rnhXnPcnSUk=oZKSNg1X-+CVZ24=hjfDZgGKQ@mail.gmail.com>
Date: Fri, 24 Mar 2017 08:18:19 +0100
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Yong Mao <yong.mao@...iatek.com>
Cc: Rob Herring <robh@...nel.org>,
Linus Walleij <linus.walleij@...aro.org>,
Daniel Kurtz <djkurtz@...omium.org>,
Chaotian Jing <chaotian.jing@...iatek.com>,
Eddie Huang <eddie.huang@...iatek.com>,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
srv_heupstream <srv_heupstream@...iatek.com>,
linux-mediatek@...ts.infradead.org,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v5 3/3] mmc: mediatek: Use data tune for CMD line tune
On 15 March 2017 at 08:26, Yong Mao <yong.mao@...iatek.com> wrote:
> From: yong mao <yong.mao@...iatek.com>
>
> If we don't select a set of better parameters for our emmc host,
> It may easily occur CMD response CRC error. And also it may cause
> cannot boot up issue.
>
> Fot getting a set of better parameters, our emmc host supports
> data tune mechanism.Therefore, our emmc driver also should change
> to use data tune for CMD line.
>
> Because our emmc host use the different clock source to sample the
> CMD signal between HS200 and HS400 mode, the parameters are also
> different between these two modes.
> Separate cmd internal delay for HS200/HS400 mode.
>
> This change can fix "System can not boot up" issue.
>
> Signed-off-by: Yong Mao <yong.mao@...iatek.com>
> Signed-off-by: Chaotian Jing <chaotian.jing@...iatek.com>
Thanks, applied for next!
Kind regards
Uffe
> ---
> drivers/mmc/host/mtk-sd.c | 168 ++++++++++++++++++++++++++++++++++++++++-----
> 1 file changed, 152 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 80ba034..07f3236 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
>
> /*--------------------------------------------------------------------------*/
> @@ -210,13 +211,18 @@
> #define MSDC_PATCH_BIT_SPCPUSH (0x1 << 29) /* RW */
> #define MSDC_PATCH_BIT_DECRCTMO (0x1 << 30) /* 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_CMD_TUNE_RX_DLY3 (0x1f << 1) /* RW */
> +
> #define EMMC50_CFG_PADCMD_LATCHCK (0x1 << 0) /* RW */
> #define EMMC50_CFG_CRCSTS_EDGE (0x1 << 3) /* RW */
> #define EMMC50_CFG_CFCSTS_SEL (0x1 << 4) /* RW */
> @@ -284,12 +290,14 @@ 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 +339,10 @@ 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 */
> + bool hs400_cmd_resp_sel_rising;
> + /* cmd response sample selection for HS400 */
> 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 */
> @@ -600,8 +612,14 @@ static void msdc_set_mclk(struct msdc_host *host, unsigned char timing, u32 hz)
> } 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.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 +1320,7 @@ 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 >= 12 && start_final < 4)
> break;
> }
>
> @@ -1325,36 +1343,67 @@ 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);
> + /*
> + * Using the same parameters, it may sometimes pass the test,
> + * but sometimes it may fail. To make sure the parameters are
> + * more stable, we test each set of parameters 3 times.
> + */
> + 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 >= 12 && final_rise_delay.start < 4)
> 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);
> + /*
> + * Using the same parameters, it may sometimes pass the test,
> + * but sometimes it may fail. To make sure the parameters are
> + * more stable, we test each set of parameters 3 times.
> + */
> + 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 >= 12 && final_fall_delay.start < 4)
> + 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,
> @@ -1366,7 +1415,71 @@ static int msdc_tune_response(struct mmc_host *mmc, u32 opcode)
> 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_dbg(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_dbg(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);
> +
> + if (host->hs400_cmd_resp_sel_rising)
> + sdr_clr_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
> + else
> + sdr_set_bits(host->base + MSDC_IOCON, MSDC_IOCON_RSPL);
> + for (i = 0 ; i < PAD_DELAY_MAX; i++) {
> + sdr_set_field(host->base + PAD_CMD_TUNE,
> + PAD_CMD_TUNE_RX_DLY3, i);
> + /*
> + * Using the same parameters, it may sometimes pass the test,
> + * but sometimes it may fail. To make sure the parameters are
> + * more stable, we test each set of parameters 3 times.
> + */
> + 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_dbg(host->dev, "Final cmd pad delay: %x\n", final_delay);
> return final_delay == 0xff ? -EIO : 0;
> }
>
> @@ -1389,7 +1502,7 @@ 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 >= 12 ||
> (final_rise_delay.start == 0 && final_rise_delay.maxlen >= 4))
> goto skip_fall;
>
> @@ -1422,6 +1535,7 @@ static int msdc_tune_data(struct mmc_host *mmc, u32 opcode)
> final_delay = final_fall_delay.final_phase;
> }
>
> + dev_dbg(host->dev, "Final data pad delay: %x\n", final_delay);
> return final_delay == 0xff ? -EIO : 0;
> }
>
> @@ -1430,7 +1544,10 @@ static int msdc_execute_tuning(struct mmc_host *mmc, u32 opcode)
> struct msdc_host *host = mmc_priv(mmc);
> int ret;
>
> - ret = msdc_tune_response(mmc, opcode);
> + 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;
> @@ -1443,6 +1560,7 @@ 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);
> return ret;
> }
>
> @@ -1477,6 +1595,25 @@ static void msdc_hw_reset(struct mmc_host *mmc)
> .hw_reset = msdc_hw_reset,
> };
>
> +static void msdc_of_property_parse(struct platform_device *pdev,
> + struct msdc_host *host)
> +{
> + of_property_read_u32(pdev->dev.of_node, "hs400-ds-delay",
> + &host->hs400_ds_delay);
> +
> + of_property_read_u32(pdev->dev.of_node, "mediatek,hs200-cmd-int-delay",
> + &host->hs200_cmd_int_delay);
> +
> + of_property_read_u32(pdev->dev.of_node, "mediatek,hs400-cmd-int-delay",
> + &host->hs400_cmd_int_delay);
> +
> + if (of_property_read_bool(pdev->dev.of_node,
> + "mediatek,hs400-cmd-resp-sel-rising"))
> + host->hs400_cmd_resp_sel_rising = true;
> + else
> + host->hs400_cmd_resp_sel_rising = false;
> +}
> +
> static int msdc_drv_probe(struct platform_device *pdev)
> {
> struct mmc_host *mmc;
> @@ -1548,10 +1685,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
> goto host_free;
> }
>
> - if (!of_property_read_u32(pdev->dev.of_node, "hs400-ds-delay",
> - &host->hs400_ds_delay))
> - dev_dbg(&pdev->dev, "hs400-ds-delay: %x\n",
> - host->hs400_ds_delay);
> + msdc_of_property_parse(pdev, host);
>
> host->dev = &pdev->dev;
> host->mmc = mmc;
> @@ -1663,6 +1797,7 @@ 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 +1810,7 @@ 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
>
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