linux-kernel - [RFC PATCH 8/8] mmc: host: sdhci-sprd: Add MMC packed request support

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Message-Id: <96e3ad74f2717029e5705fbf00bf3e61db90211d.1579164456.git.baolin.wang7@gmail.com>
Date:   Fri, 17 Jan 2020 13:24:27 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     axboe@...nel.dk, paolo.valente@...aro.org, adrian.hunter@...el.com,
        ulf.hansson@...aro.org
Cc:     zhang.lyra@...il.com, orsonzhai@...il.com, arnd@...db.de,
        linus.walleij@...aro.org, baolin.wang7@...il.com,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: [RFC PATCH 8/8] mmc: host: sdhci-sprd: Add MMC packed request support

Enable the ADMA3 transfer mode as well as adding packed operations
to support MMC packed requests to improve IO performance.

Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
---
 drivers/mmc/host/sdhci-sprd.c |   30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
index 49afe1c..daa38ed 100644
--- a/drivers/mmc/host/sdhci-sprd.c
+++ b/drivers/mmc/host/sdhci-sprd.c
@@ -390,6 +390,12 @@ static void sdhci_sprd_request_done(struct sdhci_host *host,
 	 mmc_request_done(host->mmc, mrq);
 }
 
+static void sdhci_sprd_packed_request_done(struct sdhci_host *host,
+					   struct mmc_packed_request *prq)
+{
+	mmc_hsq_finalize_packed_request(host->mmc, prq);
+}
+
 static struct sdhci_ops sdhci_sprd_ops = {
 	.read_l = sdhci_sprd_readl,
 	.write_l = sdhci_sprd_writel,
@@ -404,6 +410,7 @@ static void sdhci_sprd_request_done(struct sdhci_host *host,
 	.get_max_timeout_count = sdhci_sprd_get_max_timeout_count,
 	.get_ro = sdhci_sprd_get_ro,
 	.request_done = sdhci_sprd_request_done,
+	.packed_request_done = sdhci_sprd_packed_request_done,
 };
 
 static void sdhci_sprd_request(struct mmc_host *mmc, struct mmc_request *mrq)
@@ -546,10 +553,18 @@ static void sdhci_sprd_phy_param_parse(struct sdhci_sprd_host *sprd_host,
 		  SDHCI_QUIRK_MISSING_CAPS,
 	.quirks2 = SDHCI_QUIRK2_BROKEN_HS200 |
 		   SDHCI_QUIRK2_USE_32BIT_BLK_CNT |
-		   SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
+		   SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+		   SDHCI_QUIRK2_USE_ADMA3_SUPPORT,
 	.ops = &sdhci_sprd_ops,
 };
 
+static const struct hsq_packed_ops packed_ops = {
+	.packed_algo = mmc_hsq_packed_algo_rw,
+	.prepare_hardware = sdhci_prepare_packed,
+	.unprepare_hardware = sdhci_unprepare_packed,
+	.packed_request = sdhci_packed_request,
+};
+
 static int sdhci_sprd_probe(struct platform_device *pdev)
 {
 	struct sdhci_host *host;
@@ -676,7 +691,18 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
 		goto err_cleanup_host;
 	}
 
-	ret = mmc_hsq_init(hsq, host->mmc, NULL, 0);
+	/*
+	 * If the host controller can support ADMA3 mode, we can enable the
+	 * packed request mode to improve the read/write performance.
+	 *
+	 * Considering the maximum ADMA3 entries (default is 16) and the request
+	 * latency, we set the default maximum packed requests number is 8.
+	 */
+	if (host->flags & SDHCI_USE_ADMA3)
+		ret = mmc_hsq_init(hsq, host->mmc, &packed_ops,
+				   SDHCI_MAX_ADMA3_ENTRIES / 2);
+	else
+		ret = mmc_hsq_init(hsq, host->mmc, NULL, 0);
 	if (ret)
 		goto err_cleanup_host;
 
-- 
1.7.9.5