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SubjectRe: [PATCH V1] mmc: sdhci-msm: Add CQHCI support for sdhci-msm
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On 17/12/19 2:37 pm, Veerabhadrarao Badiganti wrote:
> From: Ritesh Harjani <riteshh@codeaurora.org>
>
> This adds CQHCI support for sdhci-msm platforms.
>
> Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
> Signed-off-by: Veerabhadrarao Badiganti <vbadigan@codeaurora.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;

> +
> + 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);
>

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