linux-kernel - Re: [PATCH RFC 05/15] mmc: sunxi: Support MMC

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Date:	Thu, 21 Jan 2016 12:14:23 +0100
From:	Hans de Goede <hdegoede@...hat.com>
To:	Chen-Yu Tsai <wens@...e.org>, Ulf Hansson <ulf.hansson@...aro.org>,
	Maxime Ripard <maxime.ripard@...e-electrons.com>
Cc:	linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-sunxi@...glegroups.com
Subject: Re: [PATCH RFC 05/15] mmc: sunxi: Support MMC_DDR52 timing modes

Hi,

On 21-01-16 06:26, Chen-Yu Tsai wrote:
> DDR transfer modes include UHS-1 DDR50 and MMC HS-DDR (or MMC_DDR52).
> Consider MMC_DDR52 when setting clock delays.
>
> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> ---
>   drivers/mmc/host/sunxi-mmc.c | 6 ++++--
>   1 file changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
> index 4bec87458317..b403a2433eec 100644
> --- a/drivers/mmc/host/sunxi-mmc.c
> +++ b/drivers/mmc/host/sunxi-mmc.c
> @@ -687,7 +687,8 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
>   		oclk_dly = host->clk_delays[SDXC_CLK_25M].output;
>   		sclk_dly = host->clk_delays[SDXC_CLK_25M].sample;
>   	} else if (rate <= 50000000) {

Shouldn't this be <= 52000000 then, considering that we may at one point get
some PLL setup where we may actually be able to do 52000000 for MMC_TIMING_MMC_DDR52 ?

> -		if (ios->timing == MMC_TIMING_UHS_DDR50) {
> +		if (ios->timing == MMC_TIMING_UHS_DDR50 ||
> +		    ios->timing == MMC_TIMING_MMC_DDR52) {
>   			oclk_dly = host->clk_delays[SDXC_CLK_50M_DDR].output;
>   			sclk_dly = host->clk_delays[SDXC_CLK_50M_DDR].sample;
>   		} else {
> @@ -762,7 +763,8 @@ static void sunxi_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
>
>   	/* set ddr mode */
>   	rval = mmc_readl(host, REG_GCTRL);
> -	if (ios->timing == MMC_TIMING_UHS_DDR50)
> +	if (ios->timing == MMC_TIMING_UHS_DDR50 ||
> +	    ios->timing == MMC_TIMING_MMC_DDR52)
>   		rval |= SDXC_DDR_MODE;
>   	else
>   		rval &= ~SDXC_DDR_MODE;
>

Regards,

Hans