linux-kernel - Re: [PATCH V1 01/11] mmc: tegra: fix ddr signaling for non-ddr modes

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Date:   Fri, 8 Mar 2019 13:44:07 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Sowjanya Komatineni <skomatineni@...dia.com>,
        ulf.hansson@...aro.org, robh+dt@...nel.org, mark.rutland@....com,
        riteshh@...eaurora.org
Cc:     thierry.reding@...il.com, jonathanh@...dia.com, anrao@...dia.com,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH V1 01/11] mmc: tegra: fix ddr signaling for non-ddr modes

On 2/03/19 7:20 AM, Sowjanya Komatineni wrote:
> ddr_signaling is set to true for DDR50 and DDR52 modes but is
> not set back to false for other modes. This programs incorrect
> host clock when mode change happens from DDR52/DDR50 to other
> SDR or HS modes like incase of mmc_retune where it switches
> from HS400 to HS DDR and then from HS DDR to HS mode and then
> to HS200.
> 
> This patch fixes the ddr_signaling to set properly for non DDR
> modes.
> 
> Signed-off-by: Sowjanya Komatineni <skomatineni@...dia.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  drivers/mmc/host/sdhci-tegra.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 32e62904c0d3..46086dd43bfb 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -779,6 +779,7 @@ static void tegra_sdhci_set_uhs_signaling(struct sdhci_host *host,
>  	bool set_dqs_trim = false;
>  	bool do_hs400_dll_cal = false;
>  
> +	tegra_host->ddr_signaling = false;
>  	switch (timing) {
>  	case MMC_TIMING_UHS_SDR50:
>  	case MMC_TIMING_UHS_SDR104:
>