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Date: Fri, 10 Jan 2020 14:26:03 +0530
From: Veerabhadrarao Badiganti <vbadigan@...eaurora.org>
To: Adrian Hunter <adrian.hunter@...el.com>, ulf.hansson@...aro.org,
agross@...nel.org
Cc: asutoshd@...eaurora.org, stummala@...eaurora.org,
sayalil@...eaurora.org, cang@...eaurora.org,
rampraka@...eaurora.org, linux-mmc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
Ritesh Harjani <riteshh@...eaurora.org>
Subject: Re: [PATCH V1] mmc: sdhci-msm: Add CQHCI support for sdhci-msm
On 1/2/2020 5:00 PM, Veerabhadrarao Badiganti wrote:
>
> On 12/20/2019 7:29 PM, Adrian Hunter wrote:
>> On 17/12/19 2:37 pm, Veerabhadrarao Badiganti wrote:
>>> From: Ritesh Harjani<riteshh@...eaurora.org>
>>>
>>> This adds CQHCI support for sdhci-msm platforms.
>>>
>>> Signed-off-by: Ritesh Harjani<riteshh@...eaurora.org>
>>> Signed-off-by: Veerabhadrarao Badiganti<vbadigan@...eaurora.org>
>>>
>>> ---
>>> This patch is based on RFC patch
>>> https://lkml.org/lkml/2017/8/30/313
>>>
>>> Changes since RFC:
>>> - Updated settings so that TDLBA won't get reset when
>>> CQE is enabled.
>>> - Removed new compatible string and moved to supports-cqe
>>> dt flag to identify CQE support.
>>> - Incorporated review comments.
>>>
>>> Tested on: qcs404, sc7180
>>> ---
>>> drivers/mmc/host/sdhci-msm.c | 115
>>> ++++++++++++++++++++++++++++++++++++++++++-
>>> 1 file changed, 114 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/drivers/mmc/host/sdhci-msm.c
>>> b/drivers/mmc/host/sdhci-msm.c
>>> index 3d0bb5e..a4e3507 100644
>>> --- a/drivers/mmc/host/sdhci-msm.c
>>> +++ b/drivers/mmc/host/sdhci-msm.c
>>> @@ -15,6 +15,7 @@
>>> #include <linux/regulator/consumer.h>
>>> #include "sdhci-pltfm.h"
>>> +#include "cqhci.h"
>>> #define CORE_MCI_VERSION 0x50
>>> #define CORE_VERSION_MAJOR_SHIFT 28
>>> @@ -122,6 +123,10 @@
>>> #define msm_host_writel(msm_host, val, host, offset) \
>>> msm_host->var_ops->msm_writel_relaxed(val, host, offset)
>>> +/* CQHCI vendor specific registers */
>>> +#define CQHCI_VENDOR_CFG1 0xA00
>>> +#define DISABLE_RST_ON_CMDQ_EN (0x3 << 13)
>>> +
>>> struct sdhci_msm_offset {
>>> u32 core_hc_mode;
>>> u32 core_mci_data_cnt;
>>> @@ -1567,6 +1572,109 @@ static void sdhci_msm_set_clock(struct
>>> sdhci_host *host, unsigned int clock)
>>> __sdhci_msm_set_clock(host, clock);
>>> }
>>> +/*****************************************************************************\
>>> + * *
>>> + * MSM Command Queue Engine
>>> (CQE) *
>>> + * *
>>> +\*****************************************************************************/
>>>
>>> +
>>> +static u32 sdhci_msm_cqe_irq(struct sdhci_host *host, u32 intmask)
>>> +{
>>> + int cmd_error = 0;
>>> + int data_error = 0;
>>> +
>>> + if (!sdhci_cqe_irq(host, intmask, &cmd_error, &data_error))
>>> + return intmask;
>>> +
>>> + cqhci_irq(host->mmc, intmask, cmd_error, data_error);
>>> + return 0;
>>> +}
>>> +
>>> +void sdhci_msm_cqe_disable(struct mmc_host *mmc, bool recovery)
>>> +{
>>> + struct sdhci_host *host = mmc_priv(mmc);
>>> + unsigned long flags;
>>> + u32 ctrl;
>>> +
>>> + /*
>>> + * When CQE is halted, the legacy SDHCI path operates only
>>> + * on 128bit descriptors in 64bit mode.
>>> + */
>>> + if (host->flags & SDHCI_USE_64_BIT_DMA)
>>> + host->desc_sz = 16;
>> The adma_table_sz depends on desc_sz, so it cannot be changed here.
>> If you do something like below, then you can set desc_sz before calling
>> sdhci_setup_host()
>>
>> diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
>> index f4540f9892ce..f1d3b70ff769 100644
>> --- a/drivers/mmc/host/sdhci.c
>> +++ b/drivers/mmc/host/sdhci.c
>> @@ -3825,9 +3825,10 @@ int sdhci_setup_host(struct sdhci_host *host)
>> void *buf;
>> if (host->flags & SDHCI_USE_64_BIT_DMA) {
>> + if (!host->desc_sz)
>> + host->desc_sz = SDHCI_ADMA2_64_DESC_SZ(host);
>> host->adma_table_sz = host->adma_table_cnt *
>> - SDHCI_ADMA2_64_DESC_SZ(host);
>> - host->desc_sz = SDHCI_ADMA2_64_DESC_SZ(host);
>> + host->desc_sz;
>> } else {
>> host->adma_table_sz = host->adma_table_cnt *
>> SDHCI_ADMA2_32_DESC_SZ;
>
> Thanks Adrian for the suggestion. I will add this change.
>
> But even with this change, still i will have to override
> 'host->desc_sz' variable since qcom sdhci controller expects/operates-on
>
> 12-byte descriptor as long was CQE is not enabled. When CQE is
> enabled, it operates only on 16-bype descriptors (even when CQE is
> halted).
>
> If i fix "host->desc_sz" to 16 then all the data transfer commands
> during card initialization (till CQE is enabled) would fail.
>
> I may have to update as below:
>
> host->desc_sz = 16;
>
> sdhci_add_host() ;
>
> host->desc_sz = 12;
>
> And then cqhci_host_ops->enable() -> host->desc_sz = 16;
>
> Please let me know if this is fine or if you have any other suggestion
> to support this limitation of qcom controller w.r.t ADMA descriptors
> with CQE.
>
Hi Adrian,
Do you have any suggestions on the way to support both the descriptor sizes?
>>> +
>>> + spin_lock_irqsave(&host->lock, flags);
>>> +
>>> + /*
>>> + * During CQE operation command complete bit gets latched.
>>> + * So s/w should clear command complete interrupt status when
>>> CQE is
>>> + * halted. Otherwise unexpected SDCHI legacy interrupt gets
>>> + * triggered when CQE is halted.
>>> + */
>>> + ctrl = sdhci_readl(host, SDHCI_INT_ENABLE);
>>> + ctrl |= SDHCI_INT_RESPONSE;
>>> + sdhci_writel(host, ctrl, SDHCI_INT_ENABLE);
>>> + sdhci_writel(host, SDHCI_INT_RESPONSE, SDHCI_INT_STATUS);
>>> +
>>> + spin_unlock_irqrestore(&host->lock, flags);
>>> +
>>> + sdhci_cqe_disable(mmc, recovery);
>>> +}
>>> +
>>> +static const struct cqhci_host_ops sdhci_msm_cqhci_ops = {
>>> + .enable = sdhci_cqe_enable,
>>> + .disable = sdhci_msm_cqe_disable,
>>> +};
>>> +
>>> +static int sdhci_msm_cqe_add_host(struct sdhci_host *host,
>>> + struct platform_device *pdev)
>>> +{
>>> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>>> + struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
>>> + struct cqhci_host *cq_host;
>>> + bool dma64;
>>> + int ret;
>>> +
>>> + ret = sdhci_setup_host(host);
>>> + if (ret)
>>> + return ret;
>>> +
>>> + cq_host = cqhci_pltfm_init(pdev);
>>> + if (IS_ERR(cq_host)) {
>>> + ret = PTR_ERR(cq_host);
>>> + dev_err(&pdev->dev, "cqhci-pltfm init: failed: %d\n", ret);
>>> + goto cleanup;
>>> + }
>>> +
>>> + msm_host->mmc->caps2 |= MMC_CAP2_CQE | MMC_CAP2_CQE_DCMD;
>>> + cq_host->ops = &sdhci_msm_cqhci_ops;
>>> +
>>> + dma64 = host->flags & SDHCI_USE_64_BIT_DMA;
>>> +
>>> + ret = cqhci_init(cq_host, host->mmc, dma64);
>>> + if (ret) {
>>> + dev_err(&pdev->dev, "%s: CQE init: failed (%d)\n",
>>> + mmc_hostname(host->mmc), ret);
>>> + goto cleanup;
>>> + }
>>> +
>>> + /* Disable cqe reset due to cqe enable signal */
>>> + cqhci_writel(cq_host, cqhci_readl(cq_host, CQHCI_VENDOR_CFG1) |
>>> + DISABLE_RST_ON_CMDQ_EN, CQHCI_VENDOR_CFG1);
>>> +
>>> + ret = __sdhci_add_host(host);
>>> + if (ret)
>>> + goto cleanup;
>>> +
>>> + dev_info(&pdev->dev, "%s: CQE init: success\n",
>>> + mmc_hostname(host->mmc));
>>> + return ret;
>>> +
>>> +cleanup:
>>> + sdhci_cleanup_host(host);
>>> + return ret;
>>> +}
>>> +
>>> /*
>>> * Platform specific register write functions. This is so that, if
>>> any
>>> * register write needs to be followed up by platform specific
>>> actions,
>>> @@ -1731,6 +1839,7 @@ static void
>>> sdhci_msm_set_regulator_caps(struct sdhci_msm_host *msm_host)
>>> .set_uhs_signaling = sdhci_msm_set_uhs_signaling,
>>> .write_w = sdhci_msm_writew,
>>> .write_b = sdhci_msm_writeb,
>>> + .irq = sdhci_msm_cqe_irq,
>>> };
>>> static const struct sdhci_pltfm_data sdhci_msm_pdata = {
>>> @@ -1754,6 +1863,7 @@ static int sdhci_msm_probe(struct
>>> platform_device *pdev)
>>> u8 core_major;
>>> const struct sdhci_msm_offset *msm_offset;
>>> const struct sdhci_msm_variant_info *var_info;
>>> + struct device_node *node = pdev->dev.of_node;
>>> host = sdhci_pltfm_init(pdev, &sdhci_msm_pdata,
>>> sizeof(*msm_host));
>>> if (IS_ERR(host))
>>> @@ -1952,7 +2062,10 @@ static int sdhci_msm_probe(struct
>>> platform_device *pdev)
>>> pm_runtime_use_autosuspend(&pdev->dev);
>>> host->mmc_host_ops.execute_tuning = sdhci_msm_execute_tuning;
>>> - ret = sdhci_add_host(host);
>>> + if (of_property_read_bool(node, "supports-cqe"))
>>> + ret = sdhci_msm_cqe_add_host(host, pdev);
>>> + else
>>> + ret = sdhci_add_host(host);
>>> if (ret)
>>> goto pm_runtime_disable;
>>> sdhci_msm_set_regulator_caps(msm_host);
>>>
Thanks
Veera
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