[PATCH v1 2/2] mmc: mediatek: Add HS400 online tuning support
Wenbin Mei
wenbin.mei at mediatek.com
Fri Aug 27 04:53:25 PDT 2021
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 at mediatek.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..f06be7f 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_can_ext_csd(card)) {
+ 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..f5ac711 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 && cmd->opcode != MMC_SEND_EXT_CSD)))
/*
* 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 && cmd->opcode != MMC_SEND_EXT_CSD)))) ||
(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 -ERANGE;
+}
+
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);
--
1.9.1
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