linux-kernel - Re: [PATCH] mmc: host: dw-mmc-rockchip: avoid logspam when cd-broken

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Message-ID: <c12e74b7-0bef-ac7a-20c1-2a17ddd050dd@arm.com>
Date:   Tue, 1 Mar 2022 11:23:44 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Peter Geis <pgwipeout@...il.com>,
        Jaehoon Chung <jh80.chung@...sung.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: host: dw-mmc-rockchip: avoid logspam when cd-broken

On 2022-02-28 22:36, Peter Geis wrote:
> The dw_mmc-rockchip driver drops a large amound of logspam constantly
> when the cd-broken flag is enabled.
> Set the warning to be debug ratelimited in this case.

Isn't this just papering over some fundamental problem with the clock? 
If it's failing to set the expected rate for communicating with a card, 
then presumably that's an issue for correct operation in general? The 
fact that polling for a card makes a lot more of that communication 
happen seems unrelated :/

Robin.

> Signed-off-by: Peter Geis <pgwipeout@...il.com>
> ---
>   drivers/mmc/host/dw_mmc-rockchip.c | 9 +++++++--
>   1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mmc/host/dw_mmc-rockchip.c b/drivers/mmc/host/dw_mmc-rockchip.c
> index 95d0ec0f5f3a..d0ebf0afa42a 100644
> --- a/drivers/mmc/host/dw_mmc-rockchip.c
> +++ b/drivers/mmc/host/dw_mmc-rockchip.c
> @@ -50,8 +50,13 @@ static void dw_mci_rk3288_set_ios(struct dw_mci *host, struct mmc_ios *ios)
>   		cclkin = ios->clock * RK3288_CLKGEN_DIV;
>   
>   	ret = clk_set_rate(host->ciu_clk, cclkin);
> -	if (ret)
> -		dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
> +	if (ret) {
> +		/* this screams when card detection is broken */
> +		if (host->slot->mmc->caps & MMC_CAP_NEEDS_POLL)
> +			dev_dbg_ratelimited(host->dev, "failed to set rate %uHz\n", ios->clock);
> +		else
> +			dev_warn(host->dev, "failed to set rate %uHz\n", ios->clock);
> +	}
>   
>   	bus_hz = clk_get_rate(host->ciu_clk) / RK3288_CLKGEN_DIV;
>   	if (bus_hz != host->bus_hz) {