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

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Date:   Tue, 20 Jun 2023 08:53:15 +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 20/06/23 08:50, Adrian Hunter wrote:
> 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>

Sorry, forgot about the issue further below which causes
the patch not to apply.  Please fix that, and then you can
add:

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

Doesn't apply.  These definitions are already
in "next" branch of:

	git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git

>>  
>>  #define SDHCI_BLOCK_GAP_CONTROL	0x2A
>>  
>