Re: [PATCH V2 1/1] mmc: sdhci-pci-o2micro: Fix Bayhub SD host hardware tuning compatibility issue for BanQ card

From: Adrian Hunter
Date: Mon Oct 09 2023 - 06:26:54 EST

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On 9/10/23 05:34, 刘畅 wrote:
>
> At 2023-09-29 14:00:45, "Adrian Hunter" <adrian.hunter@xxxxxxxxx> wrote:
>>On 28/09/23 13:22, liuchang_125125@xxxxxxx wrote:
>>> From: Charl Liu <liuchang_125125@xxxxxxx>
>>>
>>> 1.Driver get the card's MID and OID by init_card callback
>>> function to judge whether the card is BanQ card
>>> 2.Update tuning setting to make sure tuning done can be set
>>> 3.Stop transfer for CMD19 after tuning done is set to avoid data
>>> line inhibit and then set input phase manually for BanQ card
>>
>>Changing each driver for each card is not a scalable way to
>>do things.
>>
>
> This solution is suitable for cards that take longer time (>150 ns) to handle CMD19. So far, it is only found that BanQ card belongs to the above-mentioned cards.
>
>>What is different about banq cards than other cards?
>>
>
> In the tuning stage, if the interval between BanQ card receiving
> the data of the previous CMD19 and host sending the next CMD19
> is less than 330ns, BanQ card will not return data pattern to host,
> which will result in tuning timeout error.

So why not just recover from the timeout error when it happens
instead of checking for BanQ card?

> Other cards do not have this issue.
>
>>What is wrong with the way sdhci-pci-o2micro does tuning?
>>
>
> In order to reduce tuning time, O2/Bayhub use hardware tuning which
> is suitable for cards that respond quickly to CMD19.
> Host will automatically send next CMD19 after receiving data pattern returned by card.
> The interval is very short (about 150 ns), and less than 330ns,
> which will result in the compatibility issue.
>
>>>
>>> Signed-off-by: Charl Liu <liuchang_125125@xxxxxxx>
>>> ---
>>> Change in V1:
>>> Update the tuning process to be compatibility with BanQ card.
>>>
>>> Change in V2:
>>> Remove unused variables in order to fix compilation warnings
>>> noticed by kernel test robot.
>>> ---
>>> drivers/mmc/host/sdhci-pci-o2micro.c | 201 ++++++++++++++++++++++++---
>>> 1 file changed, 179 insertions(+), 22 deletions(-)
>>>
>>> diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
>>> index 7bfee28116af..668de44c6ba2 100644
>>> --- a/drivers/mmc/host/sdhci-pci-o2micro.c
>>> +++ b/drivers/mmc/host/sdhci-pci-o2micro.c
>>> @@ -36,6 +36,7 @@
>>> #define O2_SD_MISC_CTRL2 0xF0
>>> #define O2_SD_INF_MOD 0xF1
>>> #define O2_SD_MISC_CTRL4 0xFC
>>> +#define O2_SD_DLL_CTRL 0x1B0
>>> #define O2_SD_MISC_CTRL 0x1C0
>>> #define O2_SD_EXP_INT_REG 0x1E0
>>> #define O2_SD_PWR_FORCE_L0 0x0002
>>> @@ -78,7 +79,8 @@ static const u32 dmdn_table[] = {0x2B1C0000,
>>> #define DMDN_SZ ARRAY_SIZE(dmdn_table)
>>>
>>> struct o2_host {
>>> - u8 dll_adjust_count;
>>> + u8 dll_adjust_count: 4;
>>> + u8 banq_card_setting: 4;
>>> };
>>>
>>> static void sdhci_o2_wait_card_detect_stable(struct sdhci_host *host)
>>> @@ -311,14 +313,101 @@ static int sdhci_o2_dll_recovery(struct sdhci_host *host)
>>> return ret;
>>> }
>>>
>>> +static void sdhci_o2_send_stop_transmission(struct sdhci_host *host)
>>> +{
>>> + struct mmc_host *mmc = host->mmc;
>>> + struct mmc_command cmd = {};
>>> + struct mmc_request mrq = {};
>>> +
>>> + cmd.opcode = MMC_STOP_TRANSMISSION;
>>> + cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
>>> + cmd.busy_timeout = 150;
>>> +
>>> + mrq.cmd = &cmd;
>>> +
>>> + mmc_wait_for_req(mmc, &mrq);
>>> +
>>> + /*
>>> + * Command CRC error may occur due to compatibility issue.
>>> + * It is normal and ignore it here.
>>> + */
>>> + if ((cmd.error != 0) && (cmd.error != -EILSEQ))
>>> + pr_err("%s: CMD12 error: %d\n", mmc_hostname(mmc), cmd.error);
>>> +}
>>> +
>>> +static void sdhci_o2_tuning_setting(struct mmc_host *mmc, bool isbanq, u8 phase_num)
>>> +{
>>> + struct sdhci_host *host = mmc_priv(mmc);
>>> + struct sdhci_pci_slot *slot = sdhci_priv(host);
>>> + struct sdhci_pci_chip *chip = slot->chip;
>>> + u32 reg_val;
>>> +
>>> + if (isbanq) {
>>> + /* update tuning command times for BanQ card */
>>> + pci_read_config_dword(chip->pdev, O2_SD_TUNING_CTRL, &reg_val);
>>> + reg_val &= 0x00FFFFFF;
>>> + reg_val |= 0x02000000;
>>> + pci_write_config_dword(chip->pdev, O2_SD_TUNING_CTRL, reg_val);
>>> + } else {
>>> + reg_val = sdhci_readl(host, O2_SD_DLL_CTRL);
>>> + reg_val &= ~BIT(28);
>>> + sdhci_writel(host, reg_val, O2_SD_DLL_CTRL);
>>> +
>>> + /* Update tuning command times for normal card */
>>> + pci_read_config_dword(chip->pdev, O2_SD_TUNING_CTRL, &reg_val);
>>> + reg_val &= 0x00FFFFFF;
>>> + reg_val |= (phase_num * 3) << 24;
>>> + pci_write_config_dword(chip->pdev, O2_SD_TUNING_CTRL, reg_val);
>>> + }
>>> +}
>>> +
>>> +static void sdhci_o2_configure_banq_best_input_phase(struct sdhci_host *host)
>>> +{
>>> + struct sdhci_pci_slot *slot = sdhci_priv(host);
>>> + struct sdhci_pci_chip *chip = slot->chip;
>>> +
>>> + u16 dll_phase_configure = 0;
>>> + u16 best_input_phase = 0;
>>> +
>>> + switch (chip->pdev->device) {
>>> + case PCI_DEVICE_ID_O2_FUJIN2:
>>> + best_input_phase = 0x0;
>>> + break;
>>> +
>>> + case PCI_DEVICE_ID_O2_SEABIRD0:
>>> + case PCI_DEVICE_ID_O2_SEABIRD1:
>>> + best_input_phase = 0x0;
>>> + break;
>>> +
>>> + case PCI_DEVICE_ID_O2_GG8_9860:
>>> + case PCI_DEVICE_ID_O2_GG8_9861:
>>> + case PCI_DEVICE_ID_O2_GG8_9862:
>>> + case PCI_DEVICE_ID_O2_GG8_9863:
>>> + best_input_phase = 0xB;
>>> + break;
>>> +
>>> + default:
>>> + break;
>>> + }
>>> +
>>> + /* configure the best input phase (0xB) for BanQ card */
>>> + dll_phase_configure = sdhci_readw(host, 0x1B2);
>>> + dll_phase_configure = (dll_phase_configure & (u16)0xF0FF) |
>>> + (best_input_phase << 8) | BIT(12);
>>> + sdhci_writew(host, dll_phase_configure, 0x1B2);
>>> +}
>>> +
>>> static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
>>> {
>>> struct sdhci_host *host = mmc_priv(mmc);
>>> struct sdhci_pci_slot *slot = sdhci_priv(host);
>>> struct sdhci_pci_chip *chip = slot->chip;
>>> + struct o2_host *o2_host = sdhci_pci_priv(slot);
>>> int current_bus_width = 0;
>>> u32 scratch32 = 0;
>>> + u16 data_timeout_counter_value = 0;
>>> u16 scratch = 0;
>>> + u8 phase_num = 0;
>>> u8 scratch_8 = 0;
>>> u32 reg_val;
>>>
>>> @@ -334,6 +423,31 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
>>> if (WARN_ON(!mmc_op_tuning(opcode)))
>>> return -EINVAL;
>>>
>>> + if ((chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9860) ||
>>> + (chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9861) ||
>>> + (chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9862) ||
>>> + (chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9863)) {
>>> + phase_num = 14;
>>> + } else {
>>> + phase_num = 11;
>>> + }
>>> +
>>> + /* UnLock WP */
>>> + pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch_8);
>>> + scratch_8 &= 0x7f;
>>> + pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch_8);
>>> +
>>> + sdhci_o2_tuning_setting(mmc, (bool)o2_host->banq_card_setting, phase_num);
>>> +
>>> + if (o2_host->banq_card_setting) {
>>> + /*
>>> + * set data timeout counter value to 0 to ensure that
>>> + * the tuning process can be completed
>>> + */
>>> + data_timeout_counter_value = sdhci_readw(host, SDHCI_TIMEOUT_CONTROL);
>>> + sdhci_writew(host, data_timeout_counter_value & (u16)0xFFF0, SDHCI_TIMEOUT_CONTROL);
>>> + }
>>> +
>>> /* Force power mode enter L0 */
>>> scratch = sdhci_readw(host, O2_SD_MISC_CTRL);
>>> scratch |= O2_SD_PWR_FORCE_L0;
>>> @@ -351,23 +465,13 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
>>> reg_val &= ~SDHCI_CLOCK_CARD_EN;
>>> sdhci_writew(host, reg_val, SDHCI_CLOCK_CONTROL);
>>>
>>> - if (host->timing == MMC_TIMING_MMC_HS200 ||
>>> - host->timing == MMC_TIMING_UHS_SDR104) {
>>> - /* UnLock WP */
>>> - pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch_8);
>>> - scratch_8 &= 0x7f;
>>> - pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch_8);
>>> -
>>> + if ((host->timing == MMC_TIMING_MMC_HS200) ||
>>> + (host->timing == MMC_TIMING_UHS_SDR104)) {
>>> /* Set pcr 0x354[16] to choose dll clock, and set the default phase */
>>> pci_read_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, &reg_val);
>>> reg_val &= ~(O2_SD_SEL_DLL | O2_SD_PHASE_MASK);
>>> reg_val |= (O2_SD_SEL_DLL | O2_SD_FIX_PHASE);
>>> pci_write_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, reg_val);
>>> -
>>> - /* Lock WP */
>>> - pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch_8);
>>> - scratch_8 |= 0x80;
>>> - pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch_8);
>>> }
>>>
>>> /* Start clk */
>>> @@ -375,10 +479,19 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
>>> reg_val |= SDHCI_CLOCK_CARD_EN;
>>> sdhci_writew(host, reg_val, SDHCI_CLOCK_CONTROL);
>>> break;
>>> + case PCI_DEVICE_ID_O2_GG8_9860:
>>> + case PCI_DEVICE_ID_O2_GG8_9861:
>>> + case PCI_DEVICE_ID_O2_GG8_9862:
>>> + case PCI_DEVICE_ID_O2_GG8_9863:
>>> default:
>>> break;
>>> }
>>>
>>> + /* Lock WP */
>>> + pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch_8);
>>> + scratch_8 |= 0x80;
>>> + pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch_8);
>>> +
>>> /* wait DLL lock, timeout value 5ms */
>>> if (readx_poll_timeout(sdhci_o2_pll_dll_wdt_control, host,
>>> scratch32, (scratch32 & O2_DLL_LOCK_STATUS), 1, 5000))
>>> @@ -416,6 +529,20 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
>>> sdhci_set_bus_width(host, current_bus_width);
>>> }
>>>
>>> + /* update input phase for BanQ card */
>>> + if (o2_host->banq_card_setting) {
>>> + /* recover the data timeout counter value */
>>> + sdhci_writew(host, data_timeout_counter_value, SDHCI_TIMEOUT_CONTROL);
>>> +
>>> + /*
>>> + * Stop transfer for CMD19 after tuning done is set to
>>> + * avoid data line inhibit
>>> + */
>>> + sdhci_o2_send_stop_transmission(host);
>>> +
>>> + sdhci_o2_configure_banq_best_input_phase(host);
>>> + }
>>> +
>>> /* Cancel force power mode enter L0 */
>>> scratch = sdhci_readw(host, O2_SD_MISC_CTRL);
>>> scratch &= ~(O2_SD_PWR_FORCE_L0);
>>> @@ -428,6 +555,24 @@ static int sdhci_o2_execute_tuning(struct mmc_host *mmc, u32 opcode)
>>> return 0;
>>> }
>>>
>>> +static void sdhci_o2_init_card(struct mmc_host *mmc, struct mmc_card *card)
>>> +{
>>> + struct sdhci_host *host = mmc_priv(mmc);
>>> + struct sdhci_pci_slot *slot = sdhci_priv(host);
>>> + struct o2_host *o2_host = sdhci_pci_priv(slot);
>>> + unsigned int manfid;
>>> + unsigned short oemid;
>>> +
>>> + manfid = card->raw_cid[0] >> 24;
>>> + oemid = (card->raw_cid[0] >> 8) & 0xFFFF;
>>> +
>>> + /* judge whether the card is BanQ card */
>>> + if (manfid == 0x89 && oemid == 0x303)
>>> + o2_host->banq_card_setting = 1;
>>> + else
>>> + o2_host->banq_card_setting = 0;
>>> +}
>>> +
>>> static void o2_pci_led_enable(struct sdhci_pci_chip *chip)
>>> {
>>> int ret;
>>> @@ -596,15 +741,20 @@ static void sdhci_pci_o2_set_clock(struct sdhci_host *host, unsigned int clock)
>>> scratch &= 0x7f;
>>> pci_write_config_byte(chip->pdev, O2_SD_LOCK_WP, scratch);
>>>
>>> - if (chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9860 ||
>>> - chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9861 ||
>>> - chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9862 ||
>>> - chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9863) {
>>> + if ((chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9860) ||
>>> + (chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9861) ||
>>> + (chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9862) ||
>>> + (chip->pdev->device == PCI_DEVICE_ID_O2_GG8_9863)) {
>>> dmdn_208m = 0x2c500000;
>>> dmdn_200m = 0x25200000;
>>> } else {
>>> dmdn_208m = 0x2c280000;
>>> dmdn_200m = 0x25100000;
>>> +
>>> + /* open-clock for old project */
>>> + pci_read_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, &scratch_32);
>>> + scratch_32 &= ~(O2_SD_SEL_DLL | O2_SD_PHASE_MASK);
>>> + pci_write_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, scratch_32);
>>> }
>>>
>>> if ((host->timing == MMC_TIMING_UHS_SDR104) && (clock == 200000000)) {
>>> @@ -619,10 +769,6 @@ static void sdhci_pci_o2_set_clock(struct sdhci_host *host, unsigned int clock)
>>> o2_pci_set_baseclk(chip, dmdn_200m);
>>> }
>>>
>>> - pci_read_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, &scratch_32);
>>> - scratch_32 &= ~(O2_SD_SEL_DLL | O2_SD_PHASE_MASK);
>>> - pci_write_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, scratch_32);
>>> -
>>> /* Lock WP */
>>> pci_read_config_byte(chip->pdev, O2_SD_LOCK_WP, &scratch);
>>> scratch |= 0x80;
>>> @@ -632,6 +778,11 @@ static void sdhci_pci_o2_set_clock(struct sdhci_host *host, unsigned int clock)
>>> sdhci_o2_enable_clk(host, clk);
>>> }
>>>
>>> +static void sdhci_o2_set_timeout(struct sdhci_host *host, struct mmc_command *cmd)
>>> +{
>>> + sdhci_writeb(host, 0x0E, SDHCI_TIMEOUT_CONTROL);
>>> +}
>>> +
>>> static int sdhci_pci_o2_init_sd_express(struct mmc_host *mmc, struct mmc_ios *ios)
>>> {
>>> struct sdhci_host *host = mmc_priv(mmc);
>>> @@ -705,6 +856,7 @@ static int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
>>> host = slot->host;
>>>
>>> o2_host->dll_adjust_count = 0;
>>> + o2_host->banq_card_setting = 0;
>>> caps = sdhci_readl(host, SDHCI_CAPABILITIES);
>>>
>>> /*
>>> @@ -718,7 +870,9 @@ static int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
>>>
>>> sdhci_pci_o2_enable_msi(chip, host);
>>>
>>> + host->mmc_host_ops.init_card = sdhci_o2_init_card;
>>> host->mmc_host_ops.execute_tuning = sdhci_o2_execute_tuning;
>>> +
>>> switch (chip->pdev->device) {
>>> case PCI_DEVICE_ID_O2_SDS0:
>>> case PCI_DEVICE_ID_O2_SEABIRD0:
>>> @@ -770,6 +924,8 @@ static int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
>>> 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;
>>> +
>>> + sdhci_writel(host, 0xFFFFFFFF, SDHCI_INT_STATUS);
>>> break;
>>> default:
>>> break;
>>> @@ -1022,7 +1178,7 @@ static int sdhci_pci_o2_probe(struct sdhci_pci_chip *chip)
>>> /* Set output delay*/
>>> pci_read_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, &scratch_32);
>>> scratch_32 &= 0xFF0FFF00;
>>> - scratch_32 |= 0x00B0003B;
>>> + scratch_32 |= 0x00B000CB;
>>> pci_write_config_dword(chip->pdev, O2_SD_OUTPUT_CLK_SOURCE_SWITCH, scratch_32);
>>>
>>> /* Lock WP */
>>> @@ -1051,6 +1207,7 @@ static const struct sdhci_ops sdhci_pci_o2_ops = {
>>> .set_bus_width = sdhci_set_bus_width,
>>> .reset = sdhci_reset,
>>> .set_uhs_signaling = sdhci_set_uhs_signaling,
>>> + .set_timeout = sdhci_o2_set_timeout,
>>> };
>>>
>>> const struct sdhci_pci_fixes sdhci_o2 = {
>>>
>>> base-commit: 0e945134b680040b8613e962f586d91b6d40292d

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