linux-kernel - Re: [PATCH V1 1/1] mmc: sdhci-pci-o2micro: fix card detect fail issue caused by CD# debounce timeout

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Message-ID: <CAPDyKFqaQyQ0rViHUZoN8NzcPu51utu4KhC2KsY4p2s_sua=kQ@mail.gmail.com>
Date:   Mon, 7 Nov 2022 21:13:18 +0100
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Chevron Li <chevron.li@...hubtech.com>
Cc:     adrian.hunter@...el.com, linux-mmc@...r.kernel.org,
        linux-kernel@...r.kernel.org, shaper.liu@...hubtech.com,
        xiaoguang.yu@...hubtech.com, shirley.her@...hubtech.com,
        louis.lu@...hubtech.com
Subject: Re: [PATCH V1 1/1] mmc: sdhci-pci-o2micro: fix card detect fail issue
 caused by CD# debounce timeout

On Fri, 4 Nov 2022 at 10:55, Chevron Li <chevron.li@...hubtech.com> wrote:
>
> The SD card is recognized failed sometimes when resume from suspend.
> Because CD# debounce time too long then card present report wrong.
> Finally, card is recognized failed.
>
> Signed-off-by: Chevron Li <chevron.li@...hubtech.com>

Applied for next, thanks!

Kind regards
Uffe


> ---
> Change in V1:
> Adjust bayhub chip setting for CD# debounce time to minimum value
> ---
>  drivers/mmc/host/sdhci-pci-o2micro.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
> index ad457cd9cbaa..bca1d095b759 100644
> --- a/drivers/mmc/host/sdhci-pci-o2micro.c
> +++ b/drivers/mmc/host/sdhci-pci-o2micro.c
> @@ -32,6 +32,7 @@
>  #define O2_SD_CAPS             0xE0
>  #define O2_SD_ADMA1            0xE2
>  #define O2_SD_ADMA2            0xE7
> +#define O2_SD_MISC_CTRL2       0xF0
>  #define O2_SD_INF_MOD          0xF1
>  #define O2_SD_MISC_CTRL4       0xFC
>  #define O2_SD_MISC_CTRL                0x1C0
> @@ -877,6 +878,12 @@ static int sdhci_pci_o2_probe(struct sdhci_pci_chip *chip)
>                 /* Set Tuning Windows to 5 */
>                 pci_write_config_byte(chip->pdev,
>                                 O2_SD_TUNING_CTRL, 0x55);
> +               //Adjust 1st and 2nd CD debounce time
> +               pci_read_config_dword(chip->pdev, O2_SD_MISC_CTRL2, &scratch_32);
> +               scratch_32 &= 0xFFE7FFFF;
> +               scratch_32 |= 0x00180000;
> +               pci_write_config_dword(chip->pdev, O2_SD_MISC_CTRL2, scratch_32);
> +               pci_write_config_dword(chip->pdev, O2_SD_DETECT_SETTING, 1);
>                 /* Lock WP */
>                 ret = pci_read_config_byte(chip->pdev,
>                                            O2_SD_LOCK_WP, &scratch);
>
> base-commit: ee6050c8af96bba2f81e8b0793a1fc2f998fcd20
> --
> 2.25.1
>