Re: [PATCH v6 3/4] mmc: mediatek: command queue support

[Chun-Hung Wu <chun-hung.wu@mediatek.com>]

On Tue, 2020-06-09 at 19:28 +0800, Matthias Brugger wrote:
> 
> On 09/06/2020 03:18, Chun-Hung Wu wrote:
> > Support command queue for mt6779 platform.
> > a. Add msdc_set_busy_timeout() to calculate emmc write timeout.
> > b. Connect mtk msdc driver to cqhci driver through
> >    host->cq_host->ops = &msdc_cmdq_ops;
> > c. msdc_cmdq_irq() will link up with cqchi_irq(). Besides, it provides
> >    more irq error messages like RSPCRCERR/CMDTO/DATACRCERR/DATTMO.
> > d. Use the options below to separate support for CQHCI or not, because
> >    some of our platform does not support CQHCI hence no kernel option:
> >    CONFIG_MMC_CQHCI.
> >    #if IS_ENABLED(CONFIG_MMC_CQHCI)
> >    XXX //Support CQHCI
> >    #else
> >    XXX //Not support CQHCI
> >    #endif
> > 
> 
> I think that we don't need the #if IS_ENABLED() because we add a boolean in the
> msdc_host.
Select MMC_CQHCI for MMC_MTK in patch v7, "#if IS_ENABLED()" has been
removed.
> 
> > Signed-off-by: Chun-Hung Wu <chun-hung.wu@mediatek.com>
> > ---
> >  drivers/mmc/host/mtk-sd.c | 119 ++++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 119 insertions(+)
> > 
> > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> > index 84a7bd44..9d69269 100644
> > --- a/drivers/mmc/host/mtk-sd.c
> > +++ b/drivers/mmc/host/mtk-sd.c
> > @@ -31,6 +31,8 @@
> >  #include <linux/mmc/sdio.h>
> >  #include <linux/mmc/slot-gpio.h>
> >  
> > +#include "cqhci.h"
> > +
> >  #define MAX_BD_NUM          1024
> >  
> >  /*--------------------------------------------------------------------------*/
> > @@ -152,6 +154,7 @@
> >  #define MSDC_INT_DMA_BDCSERR    (0x1 << 17)	/* W1C */
> >  #define MSDC_INT_DMA_GPDCSERR   (0x1 << 18)	/* W1C */
> >  #define MSDC_INT_DMA_PROTECT    (0x1 << 19)	/* W1C */
> > +#define MSDC_INT_CMDQ           (0x1 << 28)	/* W1C */
> >  
> >  /* MSDC_INTEN mask */
> >  #define MSDC_INTEN_MMCIRQ       (0x1 << 0)	/* RW */
> > @@ -182,6 +185,7 @@
> >  /* SDC_CFG mask */
> >  #define SDC_CFG_SDIOINTWKUP     (0x1 << 0)	/* RW */
> >  #define SDC_CFG_INSWKUP         (0x1 << 1)	/* RW */
> > +#define SDC_CFG_WRDTOC          (0x1fff  << 2)  /* RW */
> >  #define SDC_CFG_BUSWIDTH        (0x3 << 16)	/* RW */
> >  #define SDC_CFG_SDIO            (0x1 << 19)	/* RW */
> >  #define SDC_CFG_SDIOIDE         (0x1 << 20)	/* RW */
> > @@ -230,6 +234,7 @@
> >  #define MSDC_PATCH_BIT_DECRCTMO   (0x1 << 30)	/* RW */
> >  
> >  #define MSDC_PATCH_BIT1_CMDTA     (0x7 << 3)    /* RW */
> > +#define MSDC_PB1_BUSY_CHECK_SEL   (0x1 << 7)    /* RW */
> >  #define MSDC_PATCH_BIT1_STOP_DLY  (0xf << 8)    /* RW */
> >  
> >  #define MSDC_PATCH_BIT2_CFGRESP   (0x1 << 15)   /* RW */
> > @@ -431,9 +436,11 @@ struct msdc_host {
> >  				 /* cmd response sample selection for HS400 */
> >  	bool hs400_mode;	/* current eMMC will run at hs400 mode */
> >  	bool internal_cd;	/* Use internal card-detect logic */
> > +	bool cqhci;		/* support eMMC hw cmdq */
> >  	struct msdc_save_para save_para; /* used when gate HCLK */
> >  	struct msdc_tune_para def_tune_para; /* default tune setting */
> >  	struct msdc_tune_para saved_tune_para; /* tune result of CMD21/CMD19 */
> > +	struct cqhci_host *cq_host;
> >  };
> >  
> >  static const struct mtk_mmc_compatible mt8135_compat = {
> > @@ -764,6 +771,15 @@ static void msdc_set_timeout(struct msdc_host *host, u64 ns, u64 clks)
> >  		      (u32)(timeout > 255 ? 255 : timeout));
> >  }
> >  
> > +static void msdc_set_busy_timeout(struct msdc_host *host, u64 ns, u64 clks)
> > +{
> > +	u64 timeout;
> > +
> > +	timeout = msdc_timeout_cal(host, ns, clks);
> > +	sdr_set_field(host->base + SDC_CFG, SDC_CFG_WRDTOC,
> > +		      (u32)(timeout > 8191 ? 8191 : timeout));
> > +}
> > +
> >  static void msdc_gate_clock(struct msdc_host *host)
> >  {
> >  	clk_disable_unprepare(host->src_clk_cg);
> > @@ -1480,6 +1496,36 @@ static void msdc_enable_sdio_irq(struct mmc_host *mmc, int enb)
> >  		pm_runtime_put_noidle(host->dev);
> >  }
> >  
> > +#if IS_ENABLED(CONFIG_MMC_CQHCI)
> > +static irqreturn_t msdc_cmdq_irq(struct msdc_host *host, u32 intsts)
> > +{
> > +	int cmd_err = 0, dat_err = 0;
> > +
> > +	if (intsts & MSDC_INT_RSPCRCERR) {
> > +		cmd_err = -EILSEQ;
> > +		dev_err(host->dev, "%s: CMD CRC ERR", __func__);
> > +	} else if (intsts & MSDC_INT_CMDTMO) {
> > +		cmd_err = -ETIMEDOUT;
> > +		dev_err(host->dev, "%s: CMD TIMEOUT ERR", __func__);
> > +	}
> > +
> > +	if (intsts & MSDC_INT_DATCRCERR) {
> > +		dat_err = -EILSEQ;
> > +		dev_err(host->dev, "%s: DATA CRC ERR", __func__);
> > +	} else if (intsts & MSDC_INT_DATTMO) {
> > +		dat_err = -ETIMEDOUT;
> > +		dev_err(host->dev, "%s: DATA TIMEOUT ERR", __func__);
> > +	}
> > +
> > +	if (cmd_err || dat_err) {
> > +		dev_err(host->dev, "cmd_err = %d, dat_err =%d, intsts = 0x%x",
> > +			cmd_err, dat_err, intsts);
> > +	}
> > +
> > +	return cqhci_irq(host->mmc, 0, cmd_err, dat_err);
> > +}
> > +#endif
> > +
> >  static irqreturn_t msdc_irq(int irq, void *dev_id)
> >  {
> >  	struct msdc_host *host = (struct msdc_host *) dev_id;
> > @@ -1516,6 +1562,16 @@ static irqreturn_t msdc_irq(int irq, void *dev_id)
> >  		if (!(events & (event_mask & ~MSDC_INT_SDIOIRQ)))
> >  			break;
> >  
> > +#if IS_ENABLED(CONFIG_MMC_CQHCI)
> > +		if ((host->mmc->caps2 & MMC_CAP2_CQE) &&
> > +		    (events & MSDC_INT_CMDQ)) {
> > +			msdc_cmdq_irq(host, events);
> > +			/* clear interrupts */
> > +			writel(events, host->base + MSDC_INT);
> > +			return IRQ_HANDLED;
> > +		}
> > +#endif
> > +
> >  		if (!mrq) {
> >  			dev_err(host->dev,
> >  				"%s: MRQ=NULL; events=%08X; event_mask=%08X\n",
> > @@ -2200,6 +2256,36 @@ static int msdc_get_cd(struct mmc_host *mmc)
> >  		return !val;
> >  }
> >  
> > +static void msdc_cqe_enable(struct mmc_host *mmc)
> > +{
> > +	struct msdc_host *host = mmc_priv(mmc);
> > +
> > +	/* enable cmdq irq */
> > +	writel(MSDC_INT_CMDQ, host->base + MSDC_INTEN);
> > +	/* enable busy check */
> > +	sdr_set_bits(host->base + MSDC_PATCH_BIT1, MSDC_PB1_BUSY_CHECK_SEL);
> > +	/* default write data / busy timeout 20s */
> > +	msdc_set_busy_timeout(host, 20 * 1000000000ULL, 0);
> > +	/* default read data timeout 1s */
> > +	msdc_set_timeout(host, 1000000000ULL, 0);
> > +}
> > +
> > +void msdc_cqe_disable(struct mmc_host *mmc, bool recovery)
> > +{
> > +	struct msdc_host *host = mmc_priv(mmc);
> > +
> > +	/* disable cmdq irq */
> > +	sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INT_CMDQ);
> > +	/* disable busy check */
> > +	sdr_clr_bits(host->base + MSDC_PATCH_BIT1, MSDC_PB1_BUSY_CHECK_SEL);
> > +
> > +	if (recovery) {
> > +		sdr_set_field(host->base + MSDC_DMA_CTRL,
> > +			      MSDC_DMA_CTRL_STOP, 1);
> > +		msdc_reset_hw(host);
> > +	}
> > +}
> > +
> >  static const struct mmc_host_ops mt_msdc_ops = {
> >  	.post_req = msdc_post_req,
> >  	.pre_req = msdc_pre_req,
> > @@ -2216,6 +2302,11 @@ static int msdc_get_cd(struct mmc_host *mmc)
> >  	.hw_reset = msdc_hw_reset,
> >  };
> >  
> > +static const struct cqhci_host_ops msdc_cmdq_ops = {
> > +	.enable         = msdc_cqe_enable,
> > +	.disable        = msdc_cqe_disable,
> > +};
> > +
> >  static void msdc_of_property_parse(struct platform_device *pdev,
> >  				   struct msdc_host *host)
> >  {
> > @@ -2236,6 +2327,12 @@ static void msdc_of_property_parse(struct platform_device *pdev,
> >  		host->hs400_cmd_resp_sel_rising = true;
> >  	else
> >  		host->hs400_cmd_resp_sel_rising = false;
> > +
> > +	if (of_property_read_bool(pdev->dev.of_node,
> > +				  "mediatek,cqhci"))
> > +		host->cqhci = true;
> > +	else
> > +		host->cqhci = false;
> 
> Does this mean that there are mt6779 contoller which do not support cqhci?
> Otherwise could add the boolean in struct mtk_mmc_compatible and get rid of the
> device tree requirement.
Will use native dt-bindings 'supports-cqe' to decide support cqhci or
no-cqhci.
> 
> Regards,
> Matthias

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