RE: [PATCH v7 RESEND 07/13] spi: imx: fix ERR009165

Robin Gong
2020-05-13T09:05:43Z

On 2020/05/13 Sascha Hauer <s.hauer@pengutronix.de> wrote:d
> > 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
> > f4f28a4..70df8e6 100644
> > --- a/drivers/spi/spi-imx.c
> > +++ b/drivers/spi/spi-imx.c
> > @@ -585,8 +585,8 @@ static int mx51_ecspi_prepare_transfer(struct
> spi_imx_data *spi_imx,
> > ctrl |= mx51_ecspi_clkdiv(spi_imx, t->speed_hz, &clk);
> > spi_imx->spi_bus_clk = clk;
> >
> > - if (spi_imx->usedma)
> > - ctrl |= MX51_ECSPI_CTRL_SMC;
> > + /* ERR009165: work in XHC mode as PIO */
> > + ctrl &= ~MX51_ECSPI_CTRL_SMC;
> >
> > writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL);
> >
> > @@ -617,7 +617,7 @@ static void mx51_setup_wml(struct spi_imx_data
> *spi_imx)
> > * and enable DMA request.
> > */
> > writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) |
> > - MX51_ECSPI_DMA_TX_WML(spi_imx->wml) |
> > + MX51_ECSPI_DMA_TX_WML(0) |
> > MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) |
> > MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN |
> > MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA);
> @@ -1171,7
> > +1171,11 @@ static int spi_imx_dma_configure(struct spi_master *master)
> > tx.direction = DMA_MEM_TO_DEV;
> > tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA;
> > tx.dst_addr_width = buswidth;
> > - tx.dst_maxburst = spi_imx->wml;
> > + /*
> > + * For ERR009165 with tx_wml = 0 could enlarge burst size to fifo size
> > + * to speed up fifo filling as possible.
> > + */
> > + tx.dst_maxburst = spi_imx->devtype_data->fifo_size;
>
> In the next patch this is changed again to:
>
> + if (spi_imx->devtype_data->tx_glitch_fixed)
> + tx.dst_maxburst = spi_imx->wml;
> + else
> + tx.dst_maxburst = spi_imx->devtype_data->fifo_size;
>
> So with tx_glitch_fixed we end up with tx.dst_maxburst being the same as two
> patches before which is rather confusing. Better introduce tx_glitch_fixed in
> this patch, or maybe even merge this patch and the next one.
Sorry confused you, I should repleace 'tx_wml=0' in the above comments with ' TX_THRESHOLD=0', which means tx transfer dma have to wait all the tx data in tx fifo transferred with ERR009165 rather than generically 'tx_wml' (for example --half fifo size used as TX_THRESHOLD). Obviously TX_THRESHOLD=0 would down performance, so enlarge dst_maxburst to fifo size as PIO with ERR009165. After ERR009165 fixed at HW level. TX_THRESHOLD could be used as common 'spi_imx->wml' so change it back. Will add more detail information in v8.