linux-kernel - Re: [PATCH V2 2/2] mmc: sdhci-pci-o2micro: add Bayhub new chip GG8 support for express card

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Message-ID: <4763f802-6d14-635e-6e7d-e0fc68af3453@intel.com>
Date:   Tue, 20 Jun 2023 08:50:13 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Chevron Li <chevron_li@....com>, ulf.hansson@...aro.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     shaper.liu@...hubtech.com, xiaoguang.yu@...hubtech.com,
        shirley.her@...hubtech.com, chevron.li@...hubtech.com
Subject: Re: [PATCH V2 2/2] mmc: sdhci-pci-o2micro: add Bayhub new chip GG8
 support for express card

On 15/06/23 12:50, Chevron Li wrote:
> From: Chevron Li <chevron.li@...hubtech.com>
> 
> Add Bayhub new chip GG8 support for SD express card.
> This patch depends on patch 1/2.
> 
> Signed-off-by: Chevron Li <chevron.li@...hubtech.com>

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

> ---
> Change in V1:
> 1.Implement the SD express card callback routine.
> 2.Add SD express card support for Bayhub GG8 chip.
> 
> Change in V2:
> 1.updated some typo in patch and modified title.
> 2.updated patch format according to reviewer's comments.
> 3.updated the logical to try UHSI when express card initializatio failed.
> ---
>  drivers/mmc/host/sdhci-pci-o2micro.c | 65 +++++++++++++++++++++++++++-
>  drivers/mmc/host/sdhci.h             |  3 ++
>  2 files changed, 67 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
> index 539bbafb3ff7..ad5502f3aa95 100644
> --- a/drivers/mmc/host/sdhci-pci-o2micro.c
> +++ b/drivers/mmc/host/sdhci-pci-o2micro.c
> @@ -21,6 +21,7 @@
>   * O2Micro device registers
>   */
>  
> +#define O2_SD_PCIE_SWITCH	0x54
>  #define O2_SD_MISC_REG5		0x64
>  #define O2_SD_LD0_CTRL		0x68
>  #define O2_SD_DEV_CTRL		0x88
> @@ -631,6 +632,67 @@ static void sdhci_pci_o2_set_clock(struct sdhci_host *host, unsigned int clock)
>  	sdhci_o2_enable_clk(host, clk);
>  }
>  
> +static int sdhci_pci_o2_init_sd_express(struct mmc_host *mmc, struct mmc_ios *ios)
> +{
> +	struct sdhci_host *host = mmc_priv(mmc);
> +	struct sdhci_pci_slot *slot = sdhci_priv(host);
> +	struct sdhci_pci_chip *chip = slot->chip;
> +	u8 scratch8;
> +	u16 scratch16;
> +	int ret;
> +
> +	/* Disable clock */
> +	sdhci_writeb(host, 0, SDHCI_CLOCK_CONTROL);
> +
> +	/* Set VDD2 voltage*/
> +	scratch8 = sdhci_readb(host, SDHCI_POWER_CONTROL);
> +	scratch8 &= 0x0F;
> +	if (host->mmc->ios.timing == MMC_TIMING_SD_EXP_1_2V &&
> +	    host->mmc->caps2 & MMC_CAP2_SD_EXP_1_2V) {
> +		scratch8 |= SDHCI_VDD2_POWER_ON | SDHCI_VDD2_POWER_120;
> +	} else {
> +		scratch8 |= SDHCI_VDD2_POWER_ON | SDHCI_VDD2_POWER_180;
> +	}
> +
> +	sdhci_writeb(host, scratch8, SDHCI_POWER_CONTROL);
> +
> +	/* UnLock WP */
> +	pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch8);
> +	scratch8 &= 0x7f;
> +	pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch8);
> +
> +	/* Wait for express card clkreqn assert */
> +	ret = read_poll_timeout(sdhci_readb, scratch8, !(scratch8 & BIT(0)),
> +				1, 30000, false, host, O2_SD_EXP_INT_REG);
> +
> +	if (!ret) {
> +		/* Switch to PCIe mode */
> +		scratch16 = sdhci_readw(host, O2_SD_PCIE_SWITCH);
> +		scratch16 |= BIT(8);
> +		sdhci_writew(host, scratch16, O2_SD_PCIE_SWITCH);
> +	} else {
> +		/* Power off VDD2 voltage*/
> +		scratch8 = sdhci_readb(host, SDHCI_POWER_CONTROL);
> +		scratch8 &= 0x0F;
> +		sdhci_writeb(host, scratch8, SDHCI_POWER_CONTROL);
> +
> +		/* Keep mode as UHSI */
> +		pci_read_config_word(chip->pdev, O2_SD_PARA_SET_REG1, &scratch16);
> +		scratch16 &= ~BIT(11);
> +		pci_write_config_word(chip->pdev, O2_SD_PARA_SET_REG1, scratch16);
> +
> +		host->mmc->ios.timing = MMC_TIMING_LEGACY;
> +		pr_info("%s: Express card initialization failed, falling back to Legacy\n",
> +			mmc_hostname(host->mmc));
> +	}
> +	/* Lock WP */
> +	pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch8);
> +	scratch8 |= 0x80;
> +	pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch8);
> +
> +	return 0;
> +}
> +
>  static int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
>  {
>  	struct sdhci_pci_chip *chip;
> @@ -703,10 +765,11 @@ static int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
>  	case PCI_DEVICE_ID_O2_GG8_9861:
>  	case PCI_DEVICE_ID_O2_GG8_9862:
>  	case PCI_DEVICE_ID_O2_GG8_9863:
> -		host->mmc->caps2 |= MMC_CAP2_NO_SDIO;
> +		host->mmc->caps2 |= MMC_CAP2_NO_SDIO | MMC_CAP2_SD_EXP | MMC_CAP2_SD_EXP_1_2V;
>  		host->mmc->caps |= MMC_CAP_HW_RESET;
>  		host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
>  		slot->host->mmc_host_ops.get_cd = sdhci_o2_get_cd;
> +		host->mmc_host_ops.init_sd_express = sdhci_pci_o2_init_sd_express;
>  		break;
>  	default:
>  		break;
> diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
> index f4f2085c274c..d09640840171 100644
> --- a/drivers/mmc/host/sdhci.h
> +++ b/drivers/mmc/host/sdhci.h
> @@ -99,6 +99,9 @@
>  #define  SDHCI_POWER_180	0x0A
>  #define  SDHCI_POWER_300	0x0C
>  #define  SDHCI_POWER_330	0x0E
> +#define  SDHCI_VDD2_POWER_ON	0x10
> +#define  SDHCI_VDD2_POWER_180	0xA0
> +#define  SDHCI_VDD2_POWER_120	0x80
>  
>  #define SDHCI_BLOCK_GAP_CONTROL	0x2A
>