linux-kernel - RE: [PATCH] mmc: sdhci-esdhc-imx: improve ESDHC_FLAG

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Message-ID: <DB7PR04MB4010D16CDF2AF90003A8381D9015A@DB7PR04MB4010.eurprd04.prod.outlook.com>
Date:   Wed, 16 Aug 2023 01:21:45 +0000
From:   Bough Chen <haibo.chen@....com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Giulio Benetti <giulio.benetti@...ettiengineering.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>
CC:     Pengutronix Kernel Team <kernel@...gutronix.de>,
        "linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jim Reinhart <jimr@...vox.com>,
        James Autry <jautry@...vox.com>,
        Matthew Maron <matthewm@...vox.com>
Subject: RE: [PATCH] mmc: sdhci-esdhc-imx: improve ESDHC_FLAG_ERR010450

> -----Original Message-----
> From: Adrian Hunter <adrian.hunter@...el.com>
> Sent: 2023年8月15日 20:08
> To: Giulio Benetti <giulio.benetti@...ettiengineering.com>; Bough Chen
> <haibo.chen@....com>; Ulf Hansson <ulf.hansson@...aro.org>; Shawn Guo
> <shawnguo@...nel.org>; Sascha Hauer <s.hauer@...gutronix.de>; Fabio
> Estevam <festevam@...il.com>; dl-linux-imx <linux-imx@....com>
> Cc: Pengutronix Kernel Team <kernel@...gutronix.de>;
> linux-mmc@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> linux-kernel@...r.kernel.org; Jim Reinhart <jimr@...vox.com>; James Autry
> <jautry@...vox.com>; Matthew Maron <matthewm@...vox.com>
> Subject: Re: [PATCH] mmc: sdhci-esdhc-imx: improve ESDHC_FLAG_ERR010450
> 
> On 12/08/23 00:48, Giulio Benetti wrote:
> > Errata ERR010450 only shows up if voltage is 1.8V, but if the device
> > is supplied by 3v3 the errata can be ignored. So let's check for if
> > quirk SDHCI_QUIRK2_NO_1_8_V is defined or not before limiting the
> frequency.
> >
> > Sponsored by: Tekvox Inc.
> > Cc: Jim Reinhart <jimr@...vox.com>
> > Cc: James Autry <jautry@...vox.com>
> > Cc: Matthew Maron <matthewm@...vox.com>
> > Signed-off-by: Giulio Benetti <giulio.benetti@...ettiengineering.com>
> 
> Haibo Chen, can we get an Acked-by from you?

Sorry for the delay, I just forget this mail.

I just double check the Errata doc, yes, the limitation is only for 1.8v I/O timing.
So
Acked-by: Haibo Chen <haibo.chen@....com>

Thanks
Best Regards
Haibo Chen.
> 
> > ---
> >  drivers/mmc/host/sdhci-esdhc-imx.c | 7 ++++---
> >  1 file changed, 4 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c
> > b/drivers/mmc/host/sdhci-esdhc-imx.c
> > index eebf94604a7f..cddecc1e1ac2 100644
> > --- a/drivers/mmc/host/sdhci-esdhc-imx.c
> > +++ b/drivers/mmc/host/sdhci-esdhc-imx.c
> > @@ -171,8 +171,8 @@
> >  #define ESDHC_FLAG_HS400		BIT(9)
> >  /*
> >   * The IP has errata ERR010450
> > - * uSDHC: Due to the I/O timing limit, for SDR mode, SD card clock
> > can't
> > - * exceed 150MHz, for DDR mode, SD card clock can't exceed 45MHz.
> > + * uSDHC: At 1.8V due to the I/O timing limit, for SDR mode, SD card
> > + * clock can't exceed 150MHz, for DDR mode, SD card clock can't exceed
> 45MHz.
> >   */
> >  #define ESDHC_FLAG_ERR010450		BIT(10)
> >  /* The IP supports HS400ES mode */
> > @@ -961,7 +961,8 @@ static inline void esdhc_pltfm_set_clock(struct
> sdhci_host *host,
> >  		| ESDHC_CLOCK_MASK);
> >  	sdhci_writel(host, temp, ESDHC_SYSTEM_CONTROL);
> >
> > -	if (imx_data->socdata->flags & ESDHC_FLAG_ERR010450) {
> > +	if ((imx_data->socdata->flags & ESDHC_FLAG_ERR010450) &&
> > +	    (!(host->quirks2 & SDHCI_QUIRK2_NO_1_8_V))) {
> >  		unsigned int max_clock;
> >
> >  		max_clock = imx_data->is_ddr ? 45000000 : 150000000;