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Date: Wed, 8 Nov 2017 20:49:55 +0000 From: "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com> To: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "stable@...r.kernel.org" <stable@...r.kernel.org> CC: Jiada Wang <jiada_wang@...tor.com>, Mark Brown <broonie@...nel.org>, "Levin, Alexander (Sasha Levin)" <alexander.levin@....verizon.com> Subject: [PATCH AUTOSEL for-4.9 04/53] spi: imx: adjust watermark level according to transfer length From: Jiada Wang <jiada_wang@...tor.com> [ Upstream commit 66459c5a50a787c474b734b586328f7111ab6df0 ] Previously DMA watermark level is configured to fifosize/2, DMA mode can be used only when transfer length can be divided by 'watermark level * bpw', which makes DMA mode not pratical. This patch adjusts watermark level to largest number (no bigger than fifosize/2) which can divide 'tranfer length / bpw' for each transfer. Signed-off-by: Jiada Wang <jiada_wang@...tor.com> Signed-off-by: Mark Brown <broonie@...nel.org> Signed-off-by: Sasha Levin <alexander.levin@...izon.com> --- drivers/spi/spi-imx.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index deb782f6556c..84a2b152be55 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -210,7 +210,7 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(master); - unsigned int bpw; + unsigned int bpw, i; if (!master->dma_rx) return false; @@ -227,12 +227,16 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, if (bpw != 1 && bpw != 2 && bpw != 4) return false; - if (transfer->len < spi_imx->wml * bpw) - return false; + for (i = spi_imx_get_fifosize(spi_imx) / 2; i > 0; i--) { + if (!(transfer->len % (i * bpw))) + break; + } - if (transfer->len % (spi_imx->wml * bpw)) + if (i == 0) return false; + spi_imx->wml = i; + return true; } @@ -818,10 +822,6 @@ static int spi_imx_dma_configure(struct spi_master *master, struct dma_slave_config rx = {}, tx = {}; struct spi_imx_data *spi_imx = spi_master_get_devdata(master); - if (bytes_per_word == spi_imx->bytes_per_word) - /* Same as last time */ - return 0; - switch (bytes_per_word) { case 4: buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; -- 2.11.0
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