From: carlos.song@nxp.com To: broonie@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, linux-imx@nxp.com, benjamin@bigler.one, stefanmoring@gmail.com Cc: linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4] spi: imx: fix the burst length at DMA mode and CPU mode Date: Thu, 1 Feb 2024 18:54:51 +0800 [thread overview] Message-ID: <20240201105451.507005-1-carlos.song@nxp.com> (raw) From: Carlos Song <carlos.song@nxp.com> For DMA mode, the bus width of the DMA is equal to the size of data word, so burst length should be configured as bits per word. For CPU mode, because of the spi transfer len is in byte, so burst length should be configured as bits per byte * spi_imx->count. Signed-off-by: Carlos Song <carlos.song@nxp.com> Reviewed-by: Clark Wang <xiaoning.wang@nxp.com> Fixes: e9b220aeacf1 ("spi: spi-imx: correctly configure burst length when using dma") Fixes: 5f66db08cbd3 ("spi: imx: Take in account bits per word instead of assuming 8-bits") --- Changes for V3: - include <linux/bits.h> Changes for V4: - keep the includes sorted alphabetically. --- drivers/spi/spi-imx.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 546cdce525fc..f7990ac2c654 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -2,6 +2,7 @@ // Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. // Copyright (C) 2008 Juergen Beisert +#include <linux/bits.h> #include <linux/clk.h> #include <linux/completion.h> #include <linux/delay.h> @@ -660,15 +661,14 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx, << MX51_ECSPI_CTRL_BL_OFFSET; else { if (spi_imx->usedma) { - ctrl |= (spi_imx->bits_per_word * - spi_imx_bytes_per_word(spi_imx->bits_per_word) - 1) + ctrl |= (spi_imx->bits_per_word - 1) << MX51_ECSPI_CTRL_BL_OFFSET; } else { if (spi_imx->count >= MX51_ECSPI_CTRL_MAX_BURST) - ctrl |= (MX51_ECSPI_CTRL_MAX_BURST - 1) + ctrl |= (MX51_ECSPI_CTRL_MAX_BURST * BITS_PER_BYTE - 1) << MX51_ECSPI_CTRL_BL_OFFSET; else - ctrl |= (spi_imx->count * spi_imx->bits_per_word - 1) + ctrl |= (spi_imx->count * BITS_PER_BYTE - 1) << MX51_ECSPI_CTRL_BL_OFFSET; } } -- 2.34.1
WARNING: multiple messages have this Message-ID (diff)
From: carlos.song@nxp.com To: broonie@kernel.org, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, linux-imx@nxp.com, benjamin@bigler.one, stefanmoring@gmail.com Cc: linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v4] spi: imx: fix the burst length at DMA mode and CPU mode Date: Thu, 1 Feb 2024 18:54:51 +0800 [thread overview] Message-ID: <20240201105451.507005-1-carlos.song@nxp.com> (raw) From: Carlos Song <carlos.song@nxp.com> For DMA mode, the bus width of the DMA is equal to the size of data word, so burst length should be configured as bits per word. For CPU mode, because of the spi transfer len is in byte, so burst length should be configured as bits per byte * spi_imx->count. Signed-off-by: Carlos Song <carlos.song@nxp.com> Reviewed-by: Clark Wang <xiaoning.wang@nxp.com> Fixes: e9b220aeacf1 ("spi: spi-imx: correctly configure burst length when using dma") Fixes: 5f66db08cbd3 ("spi: imx: Take in account bits per word instead of assuming 8-bits") --- Changes for V3: - include <linux/bits.h> Changes for V4: - keep the includes sorted alphabetically. --- drivers/spi/spi-imx.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 546cdce525fc..f7990ac2c654 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -2,6 +2,7 @@ // Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. // Copyright (C) 2008 Juergen Beisert +#include <linux/bits.h> #include <linux/clk.h> #include <linux/completion.h> #include <linux/delay.h> @@ -660,15 +661,14 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx, << MX51_ECSPI_CTRL_BL_OFFSET; else { if (spi_imx->usedma) { - ctrl |= (spi_imx->bits_per_word * - spi_imx_bytes_per_word(spi_imx->bits_per_word) - 1) + ctrl |= (spi_imx->bits_per_word - 1) << MX51_ECSPI_CTRL_BL_OFFSET; } else { if (spi_imx->count >= MX51_ECSPI_CTRL_MAX_BURST) - ctrl |= (MX51_ECSPI_CTRL_MAX_BURST - 1) + ctrl |= (MX51_ECSPI_CTRL_MAX_BURST * BITS_PER_BYTE - 1) << MX51_ECSPI_CTRL_BL_OFFSET; else - ctrl |= (spi_imx->count * spi_imx->bits_per_word - 1) + ctrl |= (spi_imx->count * BITS_PER_BYTE - 1) << MX51_ECSPI_CTRL_BL_OFFSET; } } -- 2.34.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2024-02-01 10:48 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2024-02-01 10:54 carlos.song [this message] 2024-02-01 10:54 ` [PATCH v4] spi: imx: fix the burst length at DMA mode and CPU mode carlos.song 2024-02-01 20:14 ` Benjamin Bigler 2024-02-01 20:14 ` Benjamin Bigler 2024-02-04 9:12 ` [EXT] " Carlos Song 2024-02-04 9:12 ` Carlos Song
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