Re: [PATCH] mmc:mmc-cqhci:support interrupt coalescing

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Dear Adrian，

On 2023/1/30 23:59, Adrian Hunter wrote:

On 30/01/23 08:46, Michael Wu wrote:

Support interrupt coalescing to reduce the frequency of mmc interrupts


There doesn't seem to be any users.  The new parameter to
cqhci_init() is always false.  New features are not usually
accepted without users.
At present, I have only supported this feature on the Allwinner platform because I have not get enough information about other vendors. 

There needs to be an explanation of why the change is being made.
I consider reducing the number of interrupt context switches. Can you tell me why the community does not support this feature? I wonder whether I'm doing is correct. If it's correct, i will improve this patch and incorporate it 

Also there doesn't seem to be any configuration of the CQIC
register.
At present, I am working on the hook function .cqe_enable that the ICCTH of CQIC is set in enable 



Signed-off-by: Michael Wu <michael@xxxxxxxxxxxxxxxxx>
---
  drivers/mmc/host/cqhci-core.c      | 20 +++++++++++++++-----
  drivers/mmc/host/cqhci.h           |  5 ++++-
  drivers/mmc/host/mtk-sd.c          |  2 +-
  drivers/mmc/host/sdhci-brcmstb.c   |  2 +-
  drivers/mmc/host/sdhci-esdhc-imx.c |  2 +-
  drivers/mmc/host/sdhci-msm.c       |  2 +-
  drivers/mmc/host/sdhci-of-arasan.c |  2 +-
  drivers/mmc/host/sdhci-pci-core.c  |  2 +-
  drivers/mmc/host/sdhci-pci-gli.c   |  2 +-
  drivers/mmc/host/sdhci-tegra.c     |  2 +-
  drivers/mmc/host/sdhci_am654.c     |  2 +-
  11 files changed, 28 insertions(+), 15 deletions(-)

diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
index b3d7d6d8d654..f9cdf9f04bfc 100644
--- a/drivers/mmc/host/cqhci-core.c
+++ b/drivers/mmc/host/cqhci-core.c
@@ -420,7 +420,7 @@ static void cqhci_disable(struct mmc_host *mmc)
  }
static void cqhci_prep_task_desc(struct mmc_request *mrq, 
-				 struct cqhci_host *cq_host, int tag)
+				 struct cqhci_host *cq_host, int tag, int intr)
  {
  	__le64 *task_desc = (__le64 __force *)get_desc(cq_host, tag);
  	u32 req_flags = mrq->data->flags;
@@ -428,7 +428,7 @@ static void cqhci_prep_task_desc(struct mmc_request *mrq,
desc0 = CQHCI_VALID(1) | 
  		CQHCI_END(1) |
-		CQHCI_INT(1) |
+		CQHCI_INT(intr) |
  		CQHCI_ACT(0x5) |
  		CQHCI_FORCED_PROG(!!(req_flags & MMC_DATA_FORCED_PRG)) |
  		CQHCI_DATA_TAG(!!(req_flags & MMC_DATA_DAT_TAG)) |
@@ -621,7 +621,7 @@ static int cqhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
  	}
if (mrq->data) { 
-		cqhci_prep_task_desc(mrq, cq_host, tag);
+		cqhci_prep_task_desc(mrq, cq_host, tag, (cq_host->intr_clsc ? 0 : 1));
err = cqhci_prep_tran_desc(mrq, cq_host, tag); 
  		if (err) {
@@ -812,7 +812,7 @@ static void cqhci_finish_mrq(struct mmc_host *mmc, unsigned int tag)
  irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error,
  		      int data_error)
  {
-	u32 status;
+	u32 status, rval;
  	unsigned long tag = 0, comp_status;
  	struct cqhci_host *cq_host = mmc->cqe_private;
@@ -856,6 +856,15 @@ irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error, 
  		spin_unlock(&cq_host->lock);
  	}
+ if (cq_host->intr_clsc) { 
+		rval = cqhci_readl(cq_host, CQHCI_IC);
+		rval |= CQHCI_IC_RESET;
+		cqhci_writel(cq_host, rval, CQHCI_IC);
+		rval = cqhci_readl(cq_host, CQHCI_IC);
+		rval &= (~CQHCI_IC_RESET);
+		cqhci_writel(cq_host, rval, CQHCI_IC);
+	}
+
  	if (status & CQHCI_IS_TCL)
  		wake_up(&cq_host->wait_queue);
@@ -1172,11 +1181,12 @@ static unsigned int cqhci_ver_minor(struct cqhci_host *cq_host) 
  }
int cqhci_init(struct cqhci_host *cq_host, struct mmc_host *mmc, 
-	      bool dma64)
+	      bool dma64, bool intr_clsc)
  {
  	int err;
cq_host->dma64 = dma64; 
+	cq_host->intr_clsc = intr_clsc;
  	cq_host->mmc = mmc;
  	cq_host->mmc->cqe_private = cq_host;
diff --git a/drivers/mmc/host/cqhci.h b/drivers/mmc/host/cqhci.h 
index ba9387ed90eb..acf90773c30a 100644
--- a/drivers/mmc/host/cqhci.h
+++ b/drivers/mmc/host/cqhci.h
@@ -227,6 +227,9 @@ struct cqhci_host {
/* 64 bit DMA */ 
  	bool dma64;
+
+	/* interrupt coalescing*/
+	bool intr_clsc;
  	int num_slots;
  	int qcnt;
@@ -312,7 +315,7 @@ struct platform_device; irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error, 
  		      int data_error);
-int cqhci_init(struct cqhci_host *cq_host, struct mmc_host *mmc, bool dma64);
+int cqhci_init(struct cqhci_host *cq_host, struct mmc_host *mmc, bool dma64, bool intr_clsc);
  struct cqhci_host *cqhci_pltfm_init(struct platform_device *pdev);
  int cqhci_deactivate(struct mmc_host *mmc);
  static inline int cqhci_suspend(struct mmc_host *mmc)
diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index edade0e54a0c..2c18f954d4b8 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -2796,7 +2796,7 @@ static int msdc_drv_probe(struct platform_device *pdev)
  		host->cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
  		host->cq_host->mmio = host->base + 0x800;
  		host->cq_host->ops = &msdc_cmdq_ops;
-		ret = cqhci_init(host->cq_host, mmc, true);
+		ret = cqhci_init(host->cq_host, mmc, true, false);
  		if (ret)
  			goto host_free;
  		mmc->max_segs = 128;
diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
index f2cf3d70db79..4aeaeddbbf25 100644
--- a/drivers/mmc/host/sdhci-brcmstb.c
+++ b/drivers/mmc/host/sdhci-brcmstb.c
@@ -231,7 +231,7 @@ static int sdhci_brcmstb_add_host(struct sdhci_host *host,
  		cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
  	}
- ret = cqhci_init(cq_host, host->mmc, dma64); 
+	ret = cqhci_init(cq_host, host->mmc, dma64, false);
  	if (ret)
  		goto cleanup;
diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c 
index 9e73c34b6401..7aef7abe71f1 100644
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -1712,7 +1712,7 @@ static int sdhci_esdhc_imx_probe(struct platform_device *pdev)
  		cq_host->mmio = host->ioaddr + ESDHC_CQHCI_ADDR_OFFSET;
  		cq_host->ops = &esdhc_cqhci_ops;
- err = cqhci_init(cq_host, host->mmc, false); 
+		err = cqhci_init(cq_host, host->mmc, false, false);
  		if (err)
  			goto disable_ahb_clk;
  	}
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 4ac8651d0b29..b6549d1e43ec 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -2153,7 +2153,7 @@ static int sdhci_msm_cqe_add_host(struct sdhci_host *host,
  	if (ret)
  		goto cleanup;
- ret = cqhci_init(cq_host, host->mmc, dma64); 
+	ret = cqhci_init(cq_host, host->mmc, dma64, false);
  	if (ret) {
  		dev_err(&pdev->dev, "%s: CQE init: failed (%d)\n",
  				mmc_hostname(host->mmc), ret);
diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 89c431a34c43..811f8686532d 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -1610,7 +1610,7 @@ static int sdhci_arasan_add_host(struct sdhci_arasan_data *sdhci_arasan)
  	if (dma64)
  		cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
- ret = cqhci_init(cq_host, host->mmc, dma64); 
+	ret = cqhci_init(cq_host, host->mmc, dma64, false);
  	if (ret)
  		goto cleanup;
diff --git a/drivers/mmc/host/sdhci-pci-core.c b/drivers/mmc/host/sdhci-pci-core.c 
index c359f867df0a..6f6cae6355a7 100644
--- a/drivers/mmc/host/sdhci-pci-core.c
+++ b/drivers/mmc/host/sdhci-pci-core.c
@@ -964,7 +964,7 @@ static int glk_emmc_add_host(struct sdhci_pci_slot *slot)
  	if (dma64)
  		cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
- ret = cqhci_init(cq_host, host->mmc, dma64); 
+	ret = cqhci_init(cq_host, host->mmc, dma64, false);
  	if (ret)
  		goto cleanup;
diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c 
index 633a8ee8f8c5..6917ba339aa9 100644
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -908,7 +908,7 @@ static int gl9763e_add_host(struct sdhci_pci_slot *slot)
  	if (dma64)
  		cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
- ret = cqhci_init(cq_host, host->mmc, dma64); 
+	ret = cqhci_init(cq_host, host->mmc, dma64, false);
  	if (ret)
  		goto cleanup;
diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c 
index bff084f178c9..f98a468e8f43 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -1620,7 +1620,7 @@ static int sdhci_tegra_add_host(struct sdhci_host *host)
  	if (dma64)
  		cq_host->caps |= CQHCI_TASK_DESC_SZ_128;
- ret = cqhci_init(cq_host, host->mmc, dma64); 
+	ret = cqhci_init(cq_host, host->mmc, dma64, false);
  	if (ret)
  		goto cleanup;
diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c 
index 7ef828942df3..8e7fbee70e16 100644
--- a/drivers/mmc/host/sdhci_am654.c
+++ b/drivers/mmc/host/sdhci_am654.c
@@ -568,7 +568,7 @@ static int sdhci_am654_cqe_add_host(struct sdhci_host *host)
host->mmc->caps2 |= MMC_CAP2_CQE; - return cqhci_init(cq_host, host->mmc, 1); 
+	return cqhci_init(cq_host, host->mmc, 1, false);
  }
static int sdhci_am654_get_otap_delay(struct sdhci_host *host, 

--
Regards,
Michael Wu
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