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From: <patrice.chotard@foss.st.com>
To: Mark Brown <broonie@kernel.org>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: <linux-spi@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>, <christophe.kerello@foss.st.com>,
	<patrice.chotard@foss.st.com>
Subject: [PATCH 2/3] spi: stm32-qspi: Trigger DMA only if more than 4 bytes to transfer
Date: Mon, 19 Apr 2021 14:15:40 +0200	[thread overview]
Message-ID: <20210419121541.11617-3-patrice.chotard@foss.st.com> (raw)
In-Reply-To: <20210419121541.11617-1-patrice.chotard@foss.st.com>

From: Patrice Chotard <patrice.chotard@foss.st.com>

In order to optimize accesses to spi flashes, trigger a DMA only
if more than 4 bytes has to be transferred.

DMA transfer preparation's cost becomes negligible above 4 bytes to
transfer. Below this threshold, indirect transfer give more throughput.

mtd_speedtest shows that page write throughtput increases :
  - from 779 to 853 KiB/s (~9.5%) with s25fl512s SPI-NOR.
  - from 5283 to 5666 KiB/s (~7.25%) with Micron SPI-NAND.

Signed-off-by: Christophe Kerello <christophe.kerello@foss.st.com>
Signed-off-by: Patrice Chotard <patrice.chotard@foss.st.com>
---
 drivers/spi/spi-stm32-qspi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/spi/spi-stm32-qspi.c b/drivers/spi/spi-stm32-qspi.c
index 2786470a5201..6e74d6bed54c 100644
--- a/drivers/spi/spi-stm32-qspi.c
+++ b/drivers/spi/spi-stm32-qspi.c
@@ -269,8 +269,9 @@ static int stm32_qspi_tx(struct stm32_qspi *qspi, const struct spi_mem_op *op)
 
 	if (qspi->fmode == CCR_FMODE_MM)
 		return stm32_qspi_tx_mm(qspi, op);
-	else if ((op->data.dir == SPI_MEM_DATA_IN && qspi->dma_chrx) ||
-		 (op->data.dir == SPI_MEM_DATA_OUT && qspi->dma_chtx))
+	else if (((op->data.dir == SPI_MEM_DATA_IN && qspi->dma_chrx) ||
+		 (op->data.dir == SPI_MEM_DATA_OUT && qspi->dma_chtx)) &&
+		  op->data.nbytes > 4)
 		if (!stm32_qspi_tx_dma(qspi, op))
 			return 0;
 
-- 
2.17.1


  parent reply	other threads:[~2021-04-19 12:16 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-19 12:15 [PATCH 0/3] spi: stm32-qspi: Fix and update patrice.chotard
2021-04-19 12:15 ` [PATCH 1/3] spi: stm32-qspi: fix pm_runtime usage_count counter patrice.chotard
2021-04-19 12:15 ` patrice.chotard [this message]
2021-04-19 12:15 ` [PATCH 3/3] spi: stm32-qspi: Add dirmap support patrice.chotard
2021-04-19 17:33 ` [PATCH 0/3] spi: stm32-qspi: Fix and update Mark Brown

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