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Message-ID: <6d6dd9a7ae090ad4601938261de120e6dba6ac11.camel@mediatek.com>
Date: Thu, 2 Sep 2021 14:07:19 +0800
From: Chaotian Jing <chaotian.jing@...iatek.com>
To: Wenbin Mei <wenbin.mei@...iatek.com>,
Ulf Hansson <ulf.hansson@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
"Matthias Brugger" <matthias.bgg@...il.com>
CC: Avri Altman <avri.altman@....com>,
Wolfram Sang <wsa+renesas@...g-engineering.com>,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
Linus Walleij <linus.walleij@...aro.org>,
Yue Hu <huyue2@...ong.com>, Bean Huo <beanhuo@...ron.com>,
Adrian Hunter <adrian.hunter@...el.com>,
<linux-mmc@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-mediatek@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/2] mmc: mediatek: Add HS400 online tuning support
On Thu, 2021-09-02 at 09:52 +0800, Wenbin Mei wrote:
> Due to the influence of the corner IC and vcore voltage, for the
> stability
> of HS400 mode, we Add HS400 mode online tuning support for mediatek
> mmc
> host.
>
> Signed-off-by: Wenbin Mei <wenbin.mei@...iatek.com>
Reviewed-by: Chaotian Jing <chaotian.jing@...iatek.com>
> ---
> drivers/mmc/core/mmc.c | 8 ++++
> drivers/mmc/host/mtk-sd.c | 118
> +++++++++++++++++++++++++++++++++++++++++++++-
> include/linux/mmc/host.h | 3 ++
> 3 files changed, 127 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
> index 838726b..0aa72ac 100644
> --- a/drivers/mmc/core/mmc.c
> +++ b/drivers/mmc/core/mmc.c
> @@ -1222,6 +1222,14 @@ static int mmc_select_hs400(struct mmc_card
> *card)
> mmc_set_timing(host, MMC_TIMING_MMC_HS400);
> mmc_set_bus_speed(card);
>
> + if (host->ops->execute_hs400_tuning) {
> + mmc_retune_disable(host);
> + err = host->ops->execute_hs400_tuning(host, card);
> + mmc_retune_enable(host);
> + if (err)
> + goto out_err;
> + }
> +
> if (host->ops->hs400_complete)
> host->ops->hs400_complete(host);
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index 4dfc246..484f5c3 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -258,6 +258,7 @@
> #define MSDC_PAD_TUNE_RD_SEL (0x1 << 13) /* RW */
> #define MSDC_PAD_TUNE_CMD_SEL (0x1 << 21) /* RW */
>
> +#define PAD_DS_TUNE_DLY_SEL (0x1 << 0) /* 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 */
> @@ -301,6 +302,11 @@
> #define PAD_CMD_RD_RXDLY_SEL (0x1 << 11) /* RW */
> #define PAD_CMD_TX_DLY (0x1f << 12) /* RW */
>
> +/* EMMC50_PAD_DS_TUNE mask */
> +#define PAD_DS_DLY_SEL (0x1 << 16) /* RW */
> +#define PAD_DS_DLY1 (0x1f << 10) /* RW */
> +#define PAD_DS_DLY3 (0x1f << 0) /* RW */
> +
> #define REQ_CMD_EIO (0x1 << 0)
> #define REQ_CMD_TMO (0x1 << 1)
> #define REQ_DAT_ERR (0x1 << 2)
> @@ -448,11 +454,13 @@ struct msdc_host {
> bool vqmmc_enabled;
> u32 latch_ck;
> u32 hs400_ds_delay;
> + u32 hs400_ds_dly3;
> 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 */
> + bool hs400_tuning; /* hs400 mode online tuning */
> bool internal_cd; /* Use internal card-detect logic */
> bool cqhci; /* support eMMC hw cmdq */
> struct msdc_save_para save_para; /* used when gate HCLK */
> @@ -1190,7 +1198,8 @@ static bool msdc_cmd_done(struct msdc_host
> *host, int events,
> if (!sbc_error && !(events & MSDC_INT_CMDRDY)) {
> if (events & MSDC_INT_CMDTMO ||
> (cmd->opcode != MMC_SEND_TUNING_BLOCK &&
> - cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200))
> + cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200 &&
> + !host->hs400_tuning))
> /*
> * should not clear fifo/interrupt as the tune
> data
> * may have alreay come when cmd19/cmd21 gets
> response
> @@ -1287,7 +1296,8 @@ static void msdc_cmd_next(struct msdc_host
> *host,
> if ((cmd->error &&
> !(cmd->error == -EILSEQ &&
> (cmd->opcode == MMC_SEND_TUNING_BLOCK ||
> - cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200))) ||
> + cmd->opcode == MMC_SEND_TUNING_BLOCK_HS200 ||
> + host->hs400_tuning))) ||
> (mrq->sbc && mrq->sbc->error))
> msdc_request_done(host, mrq);
> else if (cmd == mrq->sbc)
> @@ -2251,6 +2261,106 @@ static int msdc_prepare_hs400_tuning(struct
> mmc_host *mmc, struct mmc_ios *ios)
> return 0;
> }
>
> +static int msdc_send_cxd_data(struct mmc_card *card, struct mmc_host
> *host)
> +{
> + struct mmc_request mrq = {};
> + struct mmc_command cmd = {};
> + struct mmc_data data = {};
> + unsigned int len = 512;
> + struct scatterlist sg;
> + u8 *ext_csd;
> +
> + ext_csd = kzalloc(len, GFP_KERNEL);
> + if (!ext_csd)
> + return -ENOMEM;
> +
> + mrq.cmd = &cmd;
> + mrq.data = &data;
> +
> + cmd.opcode = MMC_SEND_EXT_CSD;
> + cmd.arg = 0;
> + cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
> +
> + data.blksz = len;
> + data.blocks = 1;
> + data.flags = MMC_DATA_READ;
> + data.sg = &sg;
> + data.sg_len = 1;
> +
> + sg_init_one(&sg, ext_csd, len);
> + mmc_set_data_timeout(&data, card);
> + mmc_wait_for_req(host, &mrq);
> +
> + kfree(ext_csd);
> +
> + if (cmd.error)
> + return cmd.error;
> + if (data.error)
> + return data.error;
> +
> + return 0;
> +}
> +
> +static int msdc_execute_hs400_tuning(struct mmc_host *mmc, struct
> mmc_card *card)
> +{
> + struct msdc_host *host = mmc_priv(mmc);
> + struct msdc_delay_phase dly1_delay;
> + u32 val, result_dly1 = 0;
> + int i, ret;
> +
> + if (host->top_base) {
> + sdr_set_bits(host->top_base + EMMC50_PAD_DS_TUNE,
> + PAD_DS_DLY_SEL);
> + if (host->hs400_ds_dly3)
> + sdr_set_field(host->top_base +
> EMMC50_PAD_DS_TUNE,
> + PAD_DS_DLY3, host-
> >hs400_ds_dly3);
> + } else {
> + sdr_set_bits(host->base + PAD_DS_TUNE,
> PAD_DS_TUNE_DLY_SEL);
> + if (host->hs400_ds_dly3)
> + sdr_set_field(host->base + PAD_DS_TUNE,
> + PAD_DS_TUNE_DLY3, host-
> >hs400_ds_dly3);
> + }
> +
> + host->hs400_tuning = true;
> + for (i = 0; i < PAD_DELAY_MAX; i++) {
> + if (host->top_base)
> + sdr_set_field(host->top_base +
> EMMC50_PAD_DS_TUNE,
> + PAD_DS_DLY1, i);
> + else
> + sdr_set_field(host->base + PAD_DS_TUNE,
> + PAD_DS_TUNE_DLY1, i);
> + ret = msdc_send_cxd_data(card, mmc);
> + if (!ret)
> + result_dly1 |= (1 << i);
> + }
> + host->hs400_tuning = false;
> +
> + dly1_delay = get_best_delay(host, result_dly1);
> + if (dly1_delay.maxlen == 0) {
> + dev_err(host->dev, "Failed to get DLY1 delay!\n");
> + goto fail;
> + }
> + if (host->top_base)
> + sdr_set_field(host->top_base + EMMC50_PAD_DS_TUNE,
> + PAD_DS_DLY1, dly1_delay.final_phase);
> + else
> + sdr_set_field(host->base + PAD_DS_TUNE,
> + PAD_DS_TUNE_DLY1,
> dly1_delay.final_phase);
> +
> + if (host->top_base)
> + val = readl(host->top_base + EMMC50_PAD_DS_TUNE);
> + else
> + val = readl(host->base + PAD_DS_TUNE);
> +
> + dev_info(host->dev, "Fianl PAD_DS_TUNE: 0x%x\n", val);
> +
> + return 0;
> +
> +fail:
> + dev_err(host->dev, "Failed to tuning DS pin delay!\n");
> + return -EIO;
> +}
> +
> static void msdc_hw_reset(struct mmc_host *mmc)
> {
> struct msdc_host *host = mmc_priv(mmc);
> @@ -2377,6 +2487,7 @@ static void msdc_cqe_post_disable(struct
> mmc_host *mmc)
> .card_busy = msdc_card_busy,
> .execute_tuning = msdc_execute_tuning,
> .prepare_hs400_tuning = msdc_prepare_hs400_tuning,
> + .execute_hs400_tuning = msdc_execute_hs400_tuning,
> .hw_reset = msdc_hw_reset,
> };
>
> @@ -2396,6 +2507,9 @@ static void msdc_of_property_parse(struct
> platform_device *pdev,
> of_property_read_u32(pdev->dev.of_node, "hs400-ds-delay",
> &host->hs400_ds_delay);
>
> + of_property_read_u32(pdev->dev.of_node, "mediatek,hs400-ds-
> dly3",
> + &host->hs400_ds_dly3);
> +
> of_property_read_u32(pdev->dev.of_node, "mediatek,hs200-cmd-
> int-delay",
> &host->hs200_cmd_int_delay);
>
> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
> index ff1a251..7552d5e 100644
> --- a/include/linux/mmc/host.h
> +++ b/include/linux/mmc/host.h
> @@ -162,6 +162,9 @@ struct mmc_host_ops {
> /* Prepare HS400 target operating frequency depending host
> driver */
> int (*prepare_hs400_tuning)(struct mmc_host *host, struct
> mmc_ios *ios);
>
> + /* Execute HS400 tuning depending host driver */
> + int (*execute_hs400_tuning)(struct mmc_host *host, struct
> mmc_card *card);
> +
> /* Prepare switch to DDR during the HS400 init sequence */
> int (*hs400_prepare_ddr)(struct mmc_host *host);
>
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