From: Michael Walle <michael-QKn5cuLxLXY@public.gmane.org>
To: Vladimir Oltean <olteanv-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
shawnguo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
mark.rutland-5wv7dgnIgG8@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
eha-/iRVSOupHO4@public.gmane.org,
angelo-BIYBQhTR83Y@public.gmane.org,
andrew.smirnov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
gustavo-L1vi/lXTdts+Va1GwOuvDg@public.gmane.org,
weic-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org,
mhosny-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org,
peng.ma-3arQi8VN3Tc@public.gmane.org
Subject: Re: [PATCH 4/6] spi: spi-fsl-dspi: Add support for LS1028A
Date: Mon, 09 Mar 2020 19:38:48 +0100 [thread overview]
Message-ID: <02a2816d2f39bf621dfee543ed612ae0@walle.cc> (raw)
In-Reply-To: <20200309145624.10026-5-olteanv-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Am 2020-03-09 15:56, schrieb Vladimir Oltean:
> From: Vladimir Oltean <vladimir.oltean-3arQi8VN3Tc@public.gmane.org>
>
> This is similar to the DSPI instantiation on LS1028A, except that:
> - The A-011218 erratum has been fixed, so DMA works
> - The endianness is different, which has implications on XSPI mode
>
> Some benchmarking with the following command:
>
> spidev_test --device /dev/spidev2.0 --bpw 8 --size 256 --cpha --iter
> 10000000 --speed 20000000
>
> shows that in DMA mode, it can achieve around 2400 kbps, and in XSPI
> mode, the same command goes up to 4700 kbps. This is somewhat to be
> expected, since the DMA buffer size is extremely small at 8 bytes, the
> winner becomes whomever can prepare the buffers for transmission
> quicker, and DMA mode has higher overhead there. So XSPI FIFO mode has
> been chosen as the operating mode for this chip.
>
> Signed-off-by: Vladimir Oltean <vladimir.oltean-3arQi8VN3Tc@public.gmane.org>
> ---
> drivers/spi/spi-fsl-dspi.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
> index 5624b9ee77db..264d184e7296 100644
> --- a/drivers/spi/spi-fsl-dspi.c
> +++ b/drivers/spi/spi-fsl-dspi.c
> @@ -131,6 +131,7 @@ struct fsl_dspi_devtype_data {
> enum {
> LS1021A,
> LS1012A,
> + LS1028A,
> LS1043A,
> LS1046A,
> LS2080A,
> @@ -163,6 +164,14 @@ static const struct fsl_dspi_devtype_data
> devtype_data[] = {
> .pushr_cmd = 0,
> .pushr_tx = 2,
> },
> + [LS1028A] = {
> + .trans_mode = DSPI_DMA_MODE,
shouldn't this be DSPI_XSPI_MODE according to your cover letter?
-michael
> + .dma_bufsize = 8,
> + .max_clock_factor = 8,
> + .fifo_size = 4,
> + .pushr_cmd = 2,
> + .pushr_tx = 0,
> + },
> [LS1043A] = {
> /* Has A-011218 DMA erratum */
> .trans_mode = DSPI_XSPI_MODE,
> @@ -1113,6 +1122,9 @@ static const struct of_device_id
> fsl_dspi_dt_ids[] = {
> }, {
> .compatible = "fsl,ls1012a-dspi",
> .data = &devtype_data[LS1012A],
> + }, {
> + .compatible = "fsl,ls1028a-dspi",
> + .data = &devtype_data[LS1028A],
> }, {
> .compatible = "fsl,ls1043a-dspi",
> .data = &devtype_data[LS1043A],
next prev parent reply other threads:[~2020-03-09 18:38 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-09 14:56 [PATCH 0/6] NXP DSPI bugfixes and support for LS1028A Vladimir Oltean
2020-03-09 14:56 ` [PATCH 1/6] spi: spi-fsl-dspi: Don't access reserved fields in SPI_MCR Vladimir Oltean
[not found] ` <20200309145624.10026-2-olteanv-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-03-09 18:05 ` Michael Walle
[not found] ` <c35b3c34123b43b26204a2cf360e7ec1-QKn5cuLxLXY@public.gmane.org>
2020-03-09 18:09 ` Vladimir Oltean
2020-03-09 14:56 ` [PATCH 2/6] spi: spi-fsl-dspi: Fix little endian access to PUSHR CMD and TXDATA Vladimir Oltean
[not found] ` <20200309145624.10026-3-olteanv-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-03-09 17:59 ` Michael Walle
[not found] ` <d8e39e402328b962cdbc25316a27eac8-QKn5cuLxLXY@public.gmane.org>
2020-03-09 18:07 ` Vladimir Oltean
[not found] ` <CA+h21hp4vC1c00rCgZo_hwQz3cE4dLBHjcgTHvf-+fS9a9VfxQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-03-09 18:19 ` Michael Walle
[not found] ` <a709dc91aac9124ed37ac1e7fcb7e105-QKn5cuLxLXY@public.gmane.org>
2020-03-09 18:31 ` Vladimir Oltean
2020-03-09 14:56 ` [PATCH 4/6] spi: spi-fsl-dspi: Add support for LS1028A Vladimir Oltean
[not found] ` <20200309145624.10026-5-olteanv-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-03-09 18:38 ` Michael Walle [this message]
[not found] ` <02a2816d2f39bf621dfee543ed612ae0-QKn5cuLxLXY@public.gmane.org>
2020-03-09 18:51 ` Vladimir Oltean
[not found] ` <20200309145624.10026-1-olteanv-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-03-09 14:56 ` [PATCH 3/6] spi: spi-fsl-dspi: Fix oper_word_size of zero for DMA mode Vladimir Oltean
2020-03-09 14:56 ` [PATCH 5/6] arm64: dts: ls1028a: Specify the DMA channels for the DSPI controllers Vladimir Oltean
[not found] ` <20200309145624.10026-6-olteanv-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-03-09 19:06 ` Michael Walle
[not found] ` <83af52172a3cabd662de1ed9574e4247-QKn5cuLxLXY@public.gmane.org>
2020-03-09 19:59 ` Vladimir Oltean
2020-03-09 20:17 ` Michael Walle
2020-03-09 14:56 ` [PATCH 6/6] arm64: dts: ls1028a-rdb: Add a spidev node for the mikroBUS Vladimir Oltean
[not found] ` <20200309145624.10026-7-olteanv-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2020-03-09 18:35 ` Michael Walle
[not found] ` <f213388d924b63d0fe265a2d731647be-QKn5cuLxLXY@public.gmane.org>
2020-03-09 18:50 ` Vladimir Oltean
[not found] ` <CA+h21hqOhM9+k9cKXoA8coYpxNFWpgD+FjETeB6uWLbsfrx0uw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-03-09 18:58 ` Michael Walle
2020-03-09 18:03 ` [PATCH 0/6] NXP DSPI bugfixes and support for LS1028A Michael Walle
[not found] ` <f530a0740f34b2cf26a8055d4eae2527-QKn5cuLxLXY@public.gmane.org>
2020-03-09 18:14 ` Vladimir Oltean
2020-03-09 18:31 ` Michael Walle
2020-03-09 18:48 ` Vladimir Oltean
[not found] ` <CA+h21hopP2XTx55iu_pG=xBx-TSPRBbdmoU7T2F0Gc9Qt=CsSQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2020-03-09 18:59 ` Michael Walle
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