mmc: host: sdhci-sprd: Add software queue support

Add software queue support to improve the performance.
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/f629b32943aae9e30ffa17acf4af06c270417001.1581478569.git.baolin.wang7@gmail.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/Kconfig

@@ -645,6 +645,7 @@ config MMC_SDHCI_SPRD
 	depends on ARCH_SPRD
 	depends on MMC_SDHCI_PLTFM
 	select MMC_SDHCI_IO_ACCESSORS
+	select MMC_HSQ
 	help
 	  This selects the SDIO Host Controller in Spreadtrum
 	  SoCs, this driver supports R11(IP version: R11P0).

drivers/mmc/host/sdhci-sprd.c

@@ -19,6 +19,7 @@
 #include <linux/slab.h>
 
 #include "sdhci-pltfm.h"
+#include "mmc_hsq.h"
 
 /* SDHCI_ARGUMENT2 register high 16bit */
 #define SDHCI_SPRD_ARG2_STUFF		GENMASK(31, 16)
@@ -379,6 +380,16 @@ static unsigned int sdhci_sprd_get_ro(struct sdhci_host *host)
 	return 0;
 }
 
+static void sdhci_sprd_request_done(struct sdhci_host *host,
+				    struct mmc_request *mrq)
+{
+	/* Validate if the request was from software queue firstly. */
+	if (mmc_hsq_finalize_request(host->mmc, mrq))
+		return;
+
+	 mmc_request_done(host->mmc, mrq);
+}
+
 static struct sdhci_ops sdhci_sprd_ops = {
 	.read_l = sdhci_sprd_readl,
 	.write_l = sdhci_sprd_writel,
@@ -392,6 +403,7 @@ static struct sdhci_ops sdhci_sprd_ops = {
 	.hw_reset = sdhci_sprd_hw_reset,
 	.get_max_timeout_count = sdhci_sprd_get_max_timeout_count,
 	.get_ro = sdhci_sprd_get_ro,
+	.request_done = sdhci_sprd_request_done,
 };
 
 static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq)
@@ -521,6 +533,7 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
 {
 	struct sdhci_host *host;
 	struct sdhci_sprd_host *sprd_host;
+	struct mmc_hsq *hsq;
 	struct clk *clk;
 	int ret = 0;
 
@@ -631,6 +644,18 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
 
 	sprd_host->flags = host->flags;
 
+	hsq = devm_kzalloc(&pdev->dev, sizeof(*hsq), GFP_KERNEL);
+	if (!hsq) {
+		ret = -ENOMEM;
+		goto err_cleanup_host;
+	}
+
+	ret = mmc_hsq_init(hsq, host->mmc);
+	if (ret)
+		goto err_cleanup_host;
+
+	host->always_defer_done = true;
+
 	ret = __sdhci_add_host(host);
 	if (ret)
 		goto err_cleanup_host;
@@ -689,6 +714,7 @@ static int sdhci_sprd_runtime_suspend(struct device *dev)
 	struct sdhci_host *host = dev_get_drvdata(dev);
 	struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);
 
+	mmc_hsq_suspend(host->mmc);
 	sdhci_runtime_suspend_host(host);
 
 	clk_disable_unprepare(sprd_host->clk_sdio);
@@ -717,6 +743,8 @@ static int sdhci_sprd_runtime_resume(struct device *dev)
 		goto clk_disable;
 
 	sdhci_runtime_resume_host(host, 1);
+	mmc_hsq_resume(host->mmc);
+
 	return 0;
 
 clk_disable: