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 23 2023 - 03:27:35 EST

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On 16/10/23 15:19, 刘畅 wrote:
>
> At 2023-10-09 18:26:41, "Adrian Hunter" <adrian.hunter@xxxxxxxxx> wrote:
>>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?
>>
>
> My apologies for the late reply.
> Multiple reasons can cause tuning timeout error.

Isn't that fatal?

> After trying, found that there are no appropriate flags to determine whether the tuning timeout error is caused by the compatibility issue,
> so that it is not certain whether the BanQ tuning process should be performed later.

Why not fallback to manual tuning anyway?

>
>>> 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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