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Date:	Thu, 07 Aug 2014 17:40:55 +0900
From:	Jaehoon Chung <jh80.chung@...sung.com>
To:	Sonny Rao <sonnyrao@...omium.org>,
	Ulf Hansson <ulf.hansson@...aro.org>
Cc:	dianders@...omium.org, Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-samsung-soc@...r.kernel.org,
	Yuvaraj Kumar C D <yuvaraj.cd@...sung.com>,
	grundler@...omium.org, t.figa@...sung.com,
	linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
	joshi@...sung.com, jh80.chung@...sung.com, tgih.jun@...sung.com,
	linux-next@...r.kernel.org, kgene.kim@...sung.com, cjb@...top.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] mmc: dw_mmc: change to use recommended reset procedure

Hi, 

I remembered that this patch was pushed at Ulf's tree.

Since dw_mci_idmac_reset() is located into #if CONFIG_MMC_DW_IDMAC,
it occurred the compiler error.
And it seems that didn't need to use "IS_ENABLED()" at there.

Acked-by: Jaehoon Chung <jh80.chung@...sung.com>

Best Regards,
Jaehoon Chung

On 08/05/2014 10:19 AM, Sonny Rao wrote:
> This patch changes the fifo reset code to follow the reset procedure
> outlined in the documentation of Synopsys Mobile storage host databook.
> 
> Signed-off-by: Sonny Rao <sonnyrao@...omium.org>
> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@...sung.com>
> Acked-by: Seungwon Jeon <tgih.jun@...sung.com>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> [sonnyrao: fix compile for !CONFIG_MMC_DW_IDMAC case]
> ---
>  drivers/mmc/host/dw_mmc.c | 87 ++++++++++++++++++++++++++++++++++-------------
>  drivers/mmc/host/dw_mmc.h |  5 +++
>  2 files changed, 69 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
> index 1ac227c..39cf54f 100644
> --- a/drivers/mmc/host/dw_mmc.c
> +++ b/drivers/mmc/host/dw_mmc.c
> @@ -111,8 +111,7 @@ static const u8 tuning_blk_pattern_8bit[] = {
>  	0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee,
>  };
>  
> -static inline bool dw_mci_fifo_reset(struct dw_mci *host);
> -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host);
> +static bool dw_mci_reset(struct dw_mci *host);
>  
>  #if defined(CONFIG_DEBUG_FS)
>  static int dw_mci_req_show(struct seq_file *s, void *v)
> @@ -1235,7 +1234,7 @@ static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data)
>  		 * After an error, there may be data lingering
>  		 * in the FIFO
>  		 */
> -		dw_mci_fifo_reset(host);
> +		dw_mci_reset(host);
>  	} else {
>  		data->bytes_xfered = data->blocks * data->blksz;
>  		data->error = 0;
> @@ -1352,7 +1351,7 @@ static void dw_mci_tasklet_func(unsigned long priv)
>  
>  			/* CMD error in data command */
>  			if (mrq->cmd->error && mrq->data)
> -				dw_mci_fifo_reset(host);
> +				dw_mci_reset(host);
>  
>  			host->cmd = NULL;
>  			host->data = NULL;
> @@ -1963,14 +1962,8 @@ static void dw_mci_work_routine_card(struct work_struct *work)
>  			}
>  
>  			/* Power down slot */
> -			if (present == 0) {
> -				/* Clear down the FIFO */
> -				dw_mci_fifo_reset(host);
> -#ifdef CONFIG_MMC_DW_IDMAC
> -				dw_mci_idmac_reset(host);
> -#endif
> -
> -			}
> +			if (present == 0)
> +				dw_mci_reset(host);
>  
>  			spin_unlock_bh(&host->lock);
>  
> @@ -2208,8 +2201,11 @@ static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset)
>  	return false;
>  }
>  
> -static inline bool dw_mci_fifo_reset(struct dw_mci *host)
> +static bool dw_mci_reset(struct dw_mci *host)
>  {
> +	u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET;
> +	bool ret = false;
> +
>  	/*
>  	 * Reseting generates a block interrupt, hence setting
>  	 * the scatter-gather pointer to NULL.
> @@ -2219,15 +2215,60 @@ static inline bool dw_mci_fifo_reset(struct dw_mci *host)
>  		host->sg = NULL;
>  	}
>  
> -	return dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET);
> -}
> +	if (host->use_dma)
> +		flags |= SDMMC_CTRL_DMA_RESET;
>  
> -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host)
> -{
> -	return dw_mci_ctrl_reset(host,
> -				 SDMMC_CTRL_FIFO_RESET |
> -				 SDMMC_CTRL_RESET |
> -				 SDMMC_CTRL_DMA_RESET);
> +	if (dw_mci_ctrl_reset(host, flags)) {
> +		/*
> +		 * In all cases we clear the RAWINTS register to clear any
> +		 * interrupts.
> +		 */
> +		mci_writel(host, RINTSTS, 0xFFFFFFFF);
> +
> +		/* if using dma we wait for dma_req to clear */
> +		if (host->use_dma) {
> +			unsigned long timeout = jiffies + msecs_to_jiffies(500);
> +			u32 status;
> +			do {
> +				status = mci_readl(host, STATUS);
> +				if (!(status & SDMMC_STATUS_DMA_REQ))
> +					break;
> +				cpu_relax();
> +			} while (time_before(jiffies, timeout));
> +
> +			if (status & SDMMC_STATUS_DMA_REQ) {
> +				dev_err(host->dev,
> +					"%s: Timeout waiting for dma_req to "
> +					"clear during reset\n", __func__);
> +				goto ciu_out;
> +			}
> +
> +			/* when using DMA next we reset the fifo again */
> +			if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET))
> +				goto ciu_out;
> +		}
> +	} else {
> +		/* if the controller reset bit did clear, then set clock regs */
> +		if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) {
> +			dev_err(host->dev, "%s: fifo/dma reset bits didn't "
> +				"clear but ciu was reset, doing clock update\n",
> +				__func__);
> +			goto ciu_out;
> +		}
> +	}
> +
> +#if IS_ENABLED(CONFIG_MMC_DW_IDMAC)
> +	/* It is also recommended that we reset and reprogram idmac */
> +	dw_mci_idmac_reset(host);
> +#endif
> +
> +	ret = true;
> +
> +ciu_out:
> +	/* After a CTRL reset we need to have CIU set clock registers  */
> +	mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0);
> +
> +	return ret;
>  }
>  
>  #ifdef CONFIG_OF
> @@ -2425,7 +2466,7 @@ int dw_mci_probe(struct dw_mci *host)
>  	}
>  
>  	/* Reset all blocks */
> -	if (!dw_mci_ctrl_all_reset(host))
> +	if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS))
>  		return -ENODEV;
>  
>  	host->dma_ops = host->pdata->dma_ops;
> @@ -2612,7 +2653,7 @@ int dw_mci_resume(struct dw_mci *host)
>  		}
>  	}
>  
> -	if (!dw_mci_ctrl_all_reset(host)) {
> +	if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_ALL_RESET_FLAGS)) {
>  		ret = -ENODEV;
>  		return ret;
>  	}
> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h
> index 738fa24..08fd956 100644
> --- a/drivers/mmc/host/dw_mmc.h
> +++ b/drivers/mmc/host/dw_mmc.h
> @@ -129,6 +129,7 @@
>  #define SDMMC_CMD_INDX(n)		((n) & 0x1F)
>  /* Status register defines */
>  #define SDMMC_GET_FCNT(x)		(((x)>>17) & 0x1FFF)
> +#define SDMMC_STATUS_DMA_REQ		BIT(31)
>  /* FIFOTH register defines */
>  #define SDMMC_SET_FIFOTH(m, r, t)	(((m) & 0x7) << 28 | \
>  					 ((r) & 0xFFF) << 16 | \
> @@ -150,6 +151,10 @@
>  /* Card read threshold */
>  #define SDMMC_SET_RD_THLD(v, x)		(((v) & 0x1FFF) << 16 | (x))
>  
> +/* All ctrl reset bits */
> +#define SDMMC_CTRL_ALL_RESET_FLAGS \
> +	(SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET)
> +
>  /* Register access macros */
>  #define mci_readl(dev, reg)			\
>  	__raw_readl((dev)->regs + SDMMC_##reg)
> 

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