linux-kernel - [PATCH v2] mmc: mtk-sd: reduce CIT for better performance

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Message-ID: <20230510015851.11830-1-wenbin.mei@mediatek.com>
Date:   Wed, 10 May 2023 09:58:51 +0800
From:   Wenbin Mei <wenbin.mei@...iatek.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
CC:     Chaotian Jing <chaotian.jing@...iatek.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        Wenbin Mei <wenbin.mei@...iatek.com>
Subject: [PATCH v2] mmc: mtk-sd: reduce CIT for better performance

CQHCI_SSC1 indicates to CQE the polling period to use when using periodic
SEND_QUEUE_STATUS(CMD13) polling.
The default value 0x1000 that corresponds to 150us, let's decrease it to
0x40 that corresponds to 3us, which can improve the performance of some
eMMC devices.

Signed-off-by: Wenbin Mei <wenbin.mei@...iatek.com>
---
 drivers/mmc/host/mtk-sd.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index edade0e54a0c..ffeccddcd028 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -2453,6 +2453,7 @@ static void msdc_hs400_enhanced_strobe(struct mmc_host *mmc,
 static void msdc_cqe_enable(struct mmc_host *mmc)
 {
 	struct msdc_host *host = mmc_priv(mmc);
+	struct cqhci_host *cq_host = mmc->cqe_private;
 
 	/* enable cmdq irq */
 	writel(MSDC_INT_CMDQ, host->base + MSDC_INTEN);
@@ -2462,6 +2463,9 @@ static void msdc_cqe_enable(struct mmc_host *mmc)
 	msdc_set_busy_timeout(host, 20 * 1000000000ULL, 0);
 	/* default read data timeout 1s */
 	msdc_set_timeout(host, 1000000000ULL, 0);
+
+	/* decrease the send status command idle timer to 3us */
+	cqhci_writel(cq_host, 0x40, CQHCI_SSC1);
 }
 
 static void msdc_cqe_disable(struct mmc_host *mmc, bool recovery)
-- 
2.25.1