Re: [PATCH v2 09/13] mmc: mediatek: add stop_clk fix and enhance_rx support
From: Chaotian Jing
Date: Mon Oct 09 2017 - 21:40:09 EST
On Mon, 2017-10-09 at 17:00 +0200, Matthias Brugger wrote:
>
> On 10/09/2017 01:35 PM, Chaotian Jing wrote:
> > mt2712 supports stop_clk fix and enhance_rx, which can improve
> > host stability.
> >
> > Signed-off-by: Chaotian Jing <chaotian.jing@xxxxxxxxxxxx>
> > ---
> > drivers/mmc/host/mtk-sd.c | 47 +++++++++++++++++++++++++++++++++++++++++++----
> > 1 file changed, 43 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> > index 555824d..5d99e05 100644
> > --- a/drivers/mmc/host/mtk-sd.c
> > +++ b/drivers/mmc/host/mtk-sd.c
> > @@ -67,6 +67,7 @@
> > #define SDC_RESP2 0x48
> > #define SDC_RESP3 0x4c
> > #define SDC_BLK_NUM 0x50
> > +#define SDC_ADV_CFG0 0x64
> > #define EMMC_IOCON 0x7c
> > #define SDC_ACMD_RESP 0x80
> > #define MSDC_DMA_SA 0x90
> > @@ -80,6 +81,7 @@
> > #define PAD_DS_TUNE 0x188
> > #define PAD_CMD_TUNE 0x18c
> > #define EMMC50_CFG0 0x208
> > +#define SDC_FIFO_CFG 0x228
> >
> > /*--------------------------------------------------------------------------*/
> > /* Register Mask */
> > @@ -188,6 +190,9 @@
> > #define SDC_STS_CMDBUSY (0x1 << 1) /* RW */
> > #define SDC_STS_SWR_COMPL (0x1 << 31) /* RW */
> >
> > +/* SDC_ADV_CFG0 mask */
> > +#define SDC_RX_ENHANCE_EN (0x1 << 20) /* RW */
> > +
> > /* MSDC_DMA_CTRL mask */
> > #define MSDC_DMA_CTRL_START (0x1 << 0) /* W */
> > #define MSDC_DMA_CTRL_STOP (0x1 << 1) /* W */
> > @@ -217,6 +222,8 @@
> > #define MSDC_PATCH_BIT_SPCPUSH (0x1 << 29) /* RW */
> > #define MSDC_PATCH_BIT_DECRCTMO (0x1 << 30) /* RW */
> >
> > +#define MSDC_PATCH_BIT1_STOP_DLY (0xf << 8) /* RW */
> > +
> > #define MSDC_PATCH_BIT2_CFGRESP (0x1 << 15) /* RW */
> > #define MSDC_PATCH_BIT2_CFGCRCSTS (0x1 << 28) /* RW */
> > #define MSDC_PB2_RESPWAIT (0x3 << 2) /* RW */
> > @@ -242,6 +249,9 @@
> > #define EMMC50_CFG_CRCSTS_EDGE (0x1 << 3) /* RW */
> > #define EMMC50_CFG_CFCSTS_SEL (0x1 << 4) /* RW */
> >
> > +#define SDC_FIFO_CFG_WRVALIDSEL (0x1 << 24) /* RW */
> > +#define SDC_FIFO_CFG_RDVALIDSEL (0x1 << 25) /* RW */
> > +
> > #define REQ_CMD_EIO (0x1 << 0)
> > #define REQ_CMD_TMO (0x1 << 1)
> > #define REQ_DAT_ERR (0x1 << 2)
> > @@ -308,6 +318,7 @@ struct msdc_save_para {
> > u32 pad_ds_tune;
> > u32 pad_cmd_tune;
> > u32 emmc50_cfg0;
> > + u32 sdc_fifo_cfg;
> > };
> >
> > struct mtk_mmc_compatible {
> > @@ -316,6 +327,8 @@ struct mtk_mmc_compatible {
> > bool async_fifo;
> > bool data_tune;
> > bool busy_check;
> > + bool stop_clk_fix;
> > + bool enhance_rx;
> > };
> >
> > struct msdc_tune_para {
> > @@ -381,6 +394,8 @@ struct msdc_host {
> > .async_fifo = false,
> > .data_tune = false,
> > .busy_check = false,
> > + .stop_clk_fix = false,
> > + .enhance_rx = false,
> > };
> >
> > static const struct mtk_mmc_compatible mt8173_compat = {
> > @@ -389,6 +404,8 @@ struct msdc_host {
> > .async_fifo = false,
> > .data_tune = false,
> > .busy_check = false,
> > + .stop_clk_fix = false,
> > + .enhance_rx = false,
> > };
> >
>
> If you add a flag for hs400_tune then mt8173_compat and mt8135_compat will be
> actually different and therefore it will make sense that they exist both in the
> driver code.
>
Sure, it's okay.
> Regards,
> Matthias
>
> > static const struct mtk_mmc_compatible mt2701_compat = {
> > @@ -397,6 +414,8 @@ struct msdc_host {
> > .async_fifo = true,
> > .data_tune = true,
> > .busy_check = false,
> > + .stop_clk_fix = false,
> > + .enhance_rx = false,
> > };
> >
> > static const struct mtk_mmc_compatible mt2712_compat = {
> > @@ -405,6 +424,8 @@ struct msdc_host {
> > .async_fifo = true,
> > .data_tune = true,
> > .busy_check = true,
> > + .stop_clk_fix = true,
> > + .enhance_rx = true,
> > };
> >
> > static const struct of_device_id msdc_of_ids[] = {
> > @@ -1281,15 +1302,31 @@ static void msdc_init_hw(struct msdc_host *host)
> > sdr_set_field(host->base + MSDC_PATCH_BIT, MSDC_CKGEN_MSDC_DLY_SEL, 1);
> > writel(0xffff4089, host->base + MSDC_PATCH_BIT1);
> > sdr_set_bits(host->base + EMMC50_CFG0, EMMC50_CFG_CFCSTS_SEL);
> > +
> > + if (host->dev_comp->stop_clk_fix) {
> > + sdr_set_field(host->base + MSDC_PATCH_BIT1,
> > + MSDC_PATCH_BIT1_STOP_DLY, 3);
> > + sdr_clr_bits(host->base + SDC_FIFO_CFG,
> > + SDC_FIFO_CFG_WRVALIDSEL);
> > + sdr_clr_bits(host->base + SDC_FIFO_CFG,
> > + SDC_FIFO_CFG_RDVALIDSEL);
> > + }
> > +
> > if (host->dev_comp->busy_check)
> > sdr_clr_bits(host->base + MSDC_PATCH_BIT1, (1 << 7));
> > +
> > if (host->dev_comp->async_fifo) {
> > sdr_set_field(host->base + MSDC_PATCH_BIT2,
> > MSDC_PB2_RESPWAIT, 3);
> > - sdr_set_field(host->base + MSDC_PATCH_BIT2,
> > - MSDC_PB2_RESPSTSENSEL, 2);
> > - sdr_set_field(host->base + MSDC_PATCH_BIT2,
> > - MSDC_PB2_CRCSTSENSEL, 2);
> > + if (host->dev_comp->enhance_rx) {
> > + sdr_set_bits(host->base + SDC_ADV_CFG0,
> > + SDC_RX_ENHANCE_EN);
> > + } else {
> > + sdr_set_field(host->base + MSDC_PATCH_BIT2,
> > + MSDC_PB2_RESPSTSENSEL, 2);
> > + sdr_set_field(host->base + MSDC_PATCH_BIT2,
> > + MSDC_PB2_CRCSTSENSEL, 2);
> > + }
> > /* use async fifo, then no need tune internal delay */
> > sdr_clr_bits(host->base + MSDC_PATCH_BIT2,
> > MSDC_PATCH_BIT2_CFGRESP);
> > @@ -1946,6 +1983,7 @@ static void msdc_save_reg(struct msdc_host *host)
> > 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);
> > + host->save_para.sdc_fifo_cfg = readl(host->base + SDC_FIFO_CFG);
> > }
> >
> > static void msdc_restore_reg(struct msdc_host *host)
> > @@ -1964,6 +2002,7 @@ static void msdc_restore_reg(struct msdc_host *host)
> > 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);
> > + writel(host->save_para.sdc_fifo_cfg, host->base + SDC_FIFO_CFG);
> > }
> >
> > static int msdc_runtime_suspend(struct device *dev)
> >