* Re: [PATCH 2/5] spi: sun4i: fix FIFO limit [not found] ` <e315008b5e9dc3f1490507508fd2f6e94767dfbb.1464130597.git.hramrach@gmail.com> @ 2016-05-30 8:37 ` Maxime Ripard 0 siblings, 0 replies; 28+ messages in thread From: Maxime Ripard @ 2016-05-30 8:37 UTC (permalink / raw) To: Michal Suchanek Cc: linux-sunxi, Mark Brown, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 1700 bytes --] Hi, On Thu, May 26, 2016 at 07:25:24PM -0000, Michal Suchanek wrote: > When testing SPI without DMA I noticed that filling the FIFO on the > spi controller causes timeout. > > Always leave room for one byte in the FIFO. > > Signed-off-by: Michal Suchanek <hramrach@gmail.com> Sending it to stable would be great (with a fixes tag too). > > --- > v2: > use EMSGSIZE instead of EINVAL > --- > drivers/spi/spi-sun4i.c | 8 ++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c > index fe63bbd..04f1b77 100644 > --- a/drivers/spi/spi-sun4i.c > +++ b/drivers/spi/spi-sun4i.c > @@ -180,7 +180,9 @@ static int sun4i_spi_transfer_one(struct spi_master *master, > > /* We don't support transfer larger than the FIFO */ > if (tfr->len > SUN4I_FIFO_DEPTH) > - return -EINVAL; > + return -EMSGSIZE; One new line here. > + if (tfr->tx_buf && tfr->len >= SUN4I_FIFO_DEPTH) > + return -EMSGSIZE; > > reinit_completion(&sspi->done); > sspi->tx_buf = tfr->tx_buf; > @@ -271,7 +273,9 @@ static int sun4i_spi_transfer_one(struct spi_master *master, > sun4i_spi_write(sspi, SUN4I_XMIT_CNT_REG, SUN4I_XMIT_CNT(tx_len)); > > /* Fill the TX FIFO */ > - sun4i_spi_fill_fifo(sspi, SUN4I_FIFO_DEPTH); > + /* Filling the FIFO fully causes timeout for some reason > + * at least on spi2 on A10s */ This is not the proper comment style and generate a warning with checkpatch, please fix that (and merge the comment with the previous comment). Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 819 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
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* Re: [PATCH 3/5] spi: sunxi: expose maximum transfer size limit [not found] ` <5fffb7eca6f4b70853d92be2403595d6d06bede7.1464130597.git.hramrach@gmail.com> @ 2016-05-30 8:37 ` Maxime Ripard 2016-05-30 8:57 ` Michal Suchanek 0 siblings, 1 reply; 28+ messages in thread From: Maxime Ripard @ 2016-05-30 8:37 UTC (permalink / raw) To: Michal Suchanek Cc: linux-sunxi, Mark Brown, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 371 bytes --] On Thu, May 26, 2016 at 07:25:24PM -0000, Michal Suchanek wrote: > The sun4i spi hardware can trasfer at most 63 bytes of data without DMA > support so report the limitation. Same on sun6i. Is it? Is there timeouts on the A31 and later SoCs? Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 819 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 3/5] spi: sunxi: expose maximum transfer size limit 2016-05-30 8:37 ` [PATCH 3/5] spi: sunxi: expose maximum transfer size limit Maxime Ripard @ 2016-05-30 8:57 ` Michal Suchanek 2016-06-01 18:14 ` Maxime Ripard 0 siblings, 1 reply; 28+ messages in thread From: Michal Suchanek @ 2016-05-30 8:57 UTC (permalink / raw) To: Maxime Ripard Cc: linux-sunxi, Mark Brown, Chen-Yu Tsai, linux-spi, linux-arm-kernel, Linux Kernel Mailing List Hello, On 30 May 2016 at 10:37, Maxime Ripard <maxime.ripard@free-electrons.com> wrote: > On Thu, May 26, 2016 at 07:25:24PM -0000, Michal Suchanek wrote: >> The sun4i spi hardware can trasfer at most 63 bytes of data without DMA >> support so report the limitation. Same on sun6i. > > Is it? Is there timeouts on the A31 and later SoCs? > I have no sun6i hardware to test with. This is an advisory limit you can query and it better be smaller rather than unreliable. The hard limit in the driver is still SUN6I_FIFO_DEPTH (which is 128 bytes on sun6i). You can test his without any actual SPI device. Unused pins you can multiplex as SPI suffice. Thanks Michal ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 3/5] spi: sunxi: expose maximum transfer size limit 2016-05-30 8:57 ` Michal Suchanek @ 2016-06-01 18:14 ` Maxime Ripard 0 siblings, 0 replies; 28+ messages in thread From: Maxime Ripard @ 2016-06-01 18:14 UTC (permalink / raw) To: Michal Suchanek Cc: linux-sunxi, Mark Brown, Chen-Yu Tsai, linux-spi, linux-arm-kernel, Linux Kernel Mailing List [-- Attachment #1: Type: text/plain, Size: 993 bytes --] On Mon, May 30, 2016 at 10:57:10AM +0200, Michal Suchanek wrote: > Hello, > > On 30 May 2016 at 10:37, Maxime Ripard <maxime.ripard@free-electrons.com> wrote: > > On Thu, May 26, 2016 at 07:25:24PM -0000, Michal Suchanek wrote: > >> The sun4i spi hardware can trasfer at most 63 bytes of data without DMA > >> support so report the limitation. Same on sun6i. > > > > Is it? Is there timeouts on the A31 and later SoCs? > > > > I have no sun6i hardware to test with. > > This is an advisory limit you can query and it better be smaller > rather than unreliable. The hard limit in the driver is still > SUN6I_FIFO_DEPTH (which is 128 bytes on sun6i). > > You can test his without any actual SPI device. Unused pins you can > multiplex as SPI suffice. Ok, for the time being: Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 819 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
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* Re: [PATCH 4/5] spi: sunxi: set maximum and minimum speed of SPI master [not found] ` <7292b1fa08de4f453a643beb63e9faa7826726f6.1464130597.git.hramrach@gmail.com> @ 2016-05-30 9:17 ` Maxime Ripard 0 siblings, 0 replies; 28+ messages in thread From: Maxime Ripard @ 2016-05-30 9:17 UTC (permalink / raw) To: Michal Suchanek Cc: linux-sunxi, Mark Brown, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 1289 bytes --] Hi, On Thu, May 26, 2016 at 07:25:25PM -0000, Michal Suchanek wrote: > The maximum speed of SPI master is used when maximum speed of SPI slave > is not specified. Also the __spi_validate function should check that > transfer speeds do not exceed the master limits. > > The user manual for A10 and A31 specifies maximum > speed of the SPI clock as 100MHz and minimum as 3kHz. > > Setting the SPI clock to out-of-spec values can lock up the SoC. > > Signed-off-by: Michal Suchanek <hramrach@gmail.com> > --- > drivers/spi/spi-sun4i.c | 2 ++ > drivers/spi/spi-sun6i.c | 2 ++ > 2 files changed, 4 insertions(+) > > diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c > index bf52b09..e1a75dd6 100644 > --- a/drivers/spi/spi-sun4i.c > +++ b/drivers/spi/spi-sun4i.c > @@ -405,6 +405,8 @@ static int sun4i_spi_probe(struct platform_device *pdev) > } > > sspi->master = master; > + master->max_speed_hz = 100*1000*1000; You need spaces around the * operator. > + master->min_speed_hz = 3*1000; And I'm not exactly sure why you have that weird indentation. The same applies for the sun6i driver Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 819 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
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* Re: [linux-sunxi] [PATCH 1/5] spi: sunxi: fix transfer timeout [not found] ` <cb90b922caa6ac07c1425d726ea19709ee5284f4.1464130597.git.hramrach@gmail.com> @ 2016-05-27 2:05 ` Julian Calaby 2016-05-27 5:05 ` Michal Suchanek 2016-05-30 9:44 ` Maxime Ripard 1 sibling, 1 reply; 28+ messages in thread From: Julian Calaby @ 2016-05-27 2:05 UTC (permalink / raw) To: Michal Suchanek Cc: linux-sunxi, Mark Brown, Maxime Ripard, Chen-Yu Tsai, linux-spi, Mailing List, Arm, linux-kernel Hi Michal, On Fri, May 27, 2016 at 5:25 AM, Michal Suchanek <hramrach@gmail.com> wrote: > The trasfer timeout is fixed at 1000 ms. Reading a 4Mbyte flash over > 1MHz SPI bus takes way longer than that. Calculate the timeout from the > actual time the transfer is supposed to take and multiply by 2 for good > measure. > > Signed-off-by: Michal Suchanek <hramrach@gmail.com> > --- > > v2: > - fix build error > - use unsigned instead of int in max_t > - use tfr->speed_hz instead of sspi->max_speed_hz > --- > drivers/spi/spi-sun4i.c | 11 ++++++++++- > drivers/spi/spi-sun6i.c | 11 ++++++++++- > 2 files changed, 20 insertions(+), 2 deletions(-) > > diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c > index 1ddd9e2..fe63bbd 100644 > --- a/drivers/spi/spi-sun4i.c > +++ b/drivers/spi/spi-sun4i.c > @@ -173,6 +173,7 @@ static int sun4i_spi_transfer_one(struct spi_master *master, > { > struct sun4i_spi *sspi = spi_master_get_devdata(master); > unsigned int mclk_rate, div, timeout; > + unsigned int start, end, tx_time; > unsigned int tx_len = 0; > int ret = 0; > u32 reg; > @@ -279,9 +280,17 @@ static int sun4i_spi_transfer_one(struct spi_master *master, > reg = sun4i_spi_read(sspi, SUN4I_CTL_REG); > sun4i_spi_write(sspi, SUN4I_CTL_REG, reg | SUN4I_CTL_XCH); > > + tx_time = max_t(unsigned, tfr->len * 8 * 2 / (tfr->speed_hz / 1000), You should probably use "unsigned int" instead of just "unsigned" here. > + 100); > + start = jiffies; > timeout = wait_for_completion_timeout(&sspi->done, > - msecs_to_jiffies(1000)); > + msecs_to_jiffies(tx_time)); > + end = jiffies; > if (!timeout) { > + dev_warn(&master->dev, > + "%s: timeout transferring %u bytes@%iHz for %i(%i)ms", > + dev_name(&spi->dev), tfr->len, tfr->speed_hz, > + jiffies_to_msecs(end - start), tx_time); Should the debug changes be in a separate patch? > ret = -ETIMEDOUT; > goto out; > } > diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c > index 42e2c4b..8be5c5c 100644 > --- a/drivers/spi/spi-sun6i.c > +++ b/drivers/spi/spi-sun6i.c > @@ -162,6 +162,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master, > unsigned int mclk_rate, div, timeout; > unsigned int tx_len = 0; > int ret = 0; > + unsigned int start, end, tx_time; > u32 reg; > > /* We don't support transfer larger than the FIFO */ > @@ -269,9 +270,17 @@ static int sun6i_spi_transfer_one(struct spi_master *master, > reg = sun6i_spi_read(sspi, SUN6I_TFR_CTL_REG); > sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg | SUN6I_TFR_CTL_XCH); > > + tx_time = max_t(unsigned, tfr->len * 8 * 2 / (tfr->speed_hz / 1000), Ditto, "unsigned int" instead of "unsigned"? > + 100); > + start = jiffies; > timeout = wait_for_completion_timeout(&sspi->done, > - msecs_to_jiffies(1000)); > + msecs_to_jiffies(tx_time)); > + end = jiffies; > if (!timeout) { > + dev_warn(&master->dev, > + "%s: timeout transferring %u bytes@%iHz for %i(%i)ms", > + dev_name(&spi->dev), tfr->len, tfr->speed_hz, > + jiffies_to_msecs(end - start), tx_time); Ditto, separate patch? Also, should the changes for the drivers be in two separate patches also? Thanks, -- Julian Calaby Email: julian.calaby@gmail.com Profile: http://www.google.com/profiles/julian.calaby/ ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] [PATCH 1/5] spi: sunxi: fix transfer timeout 2016-05-27 2:05 ` [linux-sunxi] [PATCH 1/5] spi: sunxi: fix transfer timeout Julian Calaby @ 2016-05-27 5:05 ` Michal Suchanek 2016-05-27 5:10 ` Julian Calaby 0 siblings, 1 reply; 28+ messages in thread From: Michal Suchanek @ 2016-05-27 5:05 UTC (permalink / raw) To: Julian Calaby Cc: linux-sunxi, Mark Brown, Maxime Ripard, Chen-Yu Tsai, linux-spi, Mailing List, Arm, linux-kernel On 27 May 2016 at 04:05, Julian Calaby <julian.calaby@gmail.com> wrote: > Hi Michal, > > On Fri, May 27, 2016 at 5:25 AM, Michal Suchanek <hramrach@gmail.com> wrote: >> The trasfer timeout is fixed at 1000 ms. Reading a 4Mbyte flash over >> 1MHz SPI bus takes way longer than that. Calculate the timeout from the >> actual time the transfer is supposed to take and multiply by 2 for good >> measure. >> >> Signed-off-by: Michal Suchanek <hramrach@gmail.com> >> --- >> >> v2: >> - fix build error >> - use unsigned instead of int in max_t >> - use tfr->speed_hz instead of sspi->max_speed_hz >> --- >> drivers/spi/spi-sun4i.c | 11 ++++++++++- >> drivers/spi/spi-sun6i.c | 11 ++++++++++- >> 2 files changed, 20 insertions(+), 2 deletions(-) >> >> diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c >> index 1ddd9e2..fe63bbd 100644 >> --- a/drivers/spi/spi-sun4i.c >> +++ b/drivers/spi/spi-sun4i.c >> @@ -173,6 +173,7 @@ static int sun4i_spi_transfer_one(struct spi_master *master, >> { >> struct sun4i_spi *sspi = spi_master_get_devdata(master); >> unsigned int mclk_rate, div, timeout; >> + unsigned int start, end, tx_time; >> unsigned int tx_len = 0; >> int ret = 0; >> u32 reg; >> @@ -279,9 +280,17 @@ static int sun4i_spi_transfer_one(struct spi_master *master, >> reg = sun4i_spi_read(sspi, SUN4I_CTL_REG); >> sun4i_spi_write(sspi, SUN4I_CTL_REG, reg | SUN4I_CTL_XCH); >> >> + tx_time = max_t(unsigned, tfr->len * 8 * 2 / (tfr->speed_hz / 1000), > > You should probably use "unsigned int" instead of just "unsigned" here. > >> + 100); Or just 100U constant and avoid max_t altogether. >> + start = jiffies; >> timeout = wait_for_completion_timeout(&sspi->done, >> - msecs_to_jiffies(1000)); >> + msecs_to_jiffies(tx_time)); >> + end = jiffies; >> if (!timeout) { >> + dev_warn(&master->dev, >> + "%s: timeout transferring %u bytes@%iHz for %i(%i)ms", >> + dev_name(&spi->dev), tfr->len, tfr->speed_hz, >> + jiffies_to_msecs(end - start), tx_time); > > Should the debug changes be in a separate patch? Is this so big of a change that it needs to be split? > >> ret = -ETIMEDOUT; >> goto out; >> } >> diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c >> index 42e2c4b..8be5c5c 100644 >> --- a/drivers/spi/spi-sun6i.c >> +++ b/drivers/spi/spi-sun6i.c >> @@ -162,6 +162,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master, >> unsigned int mclk_rate, div, timeout; >> unsigned int tx_len = 0; >> int ret = 0; >> + unsigned int start, end, tx_time; >> u32 reg; >> >> /* We don't support transfer larger than the FIFO */ >> @@ -269,9 +270,17 @@ static int sun6i_spi_transfer_one(struct spi_master *master, >> reg = sun6i_spi_read(sspi, SUN6I_TFR_CTL_REG); >> sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg | SUN6I_TFR_CTL_XCH); >> >> + tx_time = max_t(unsigned, tfr->len * 8 * 2 / (tfr->speed_hz / 1000), > > Ditto, "unsigned int" instead of "unsigned"? > >> + 100); >> + start = jiffies; >> timeout = wait_for_completion_timeout(&sspi->done, >> - msecs_to_jiffies(1000)); >> + msecs_to_jiffies(tx_time)); >> + end = jiffies; >> if (!timeout) { >> + dev_warn(&master->dev, >> + "%s: timeout transferring %u bytes@%iHz for %i(%i)ms", >> + dev_name(&spi->dev), tfr->len, tfr->speed_hz, >> + jiffies_to_msecs(end - start), tx_time); > > Ditto, separate patch? > > Also, should the changes for the drivers be in two separate patches also? That's basically the same driver with different constants so I guess not. Thanks Michal ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] [PATCH 1/5] spi: sunxi: fix transfer timeout 2016-05-27 5:05 ` Michal Suchanek @ 2016-05-27 5:10 ` Julian Calaby 2016-05-30 11:23 ` Mark Brown 0 siblings, 1 reply; 28+ messages in thread From: Julian Calaby @ 2016-05-27 5:10 UTC (permalink / raw) To: Michal Suchanek Cc: linux-sunxi, Mark Brown, Maxime Ripard, Chen-Yu Tsai, linux-spi, Mailing List, Arm, linux-kernel Hi Michal, On Fri, May 27, 2016 at 3:05 PM, Michal Suchanek <hramrach@gmail.com> wrote: > On 27 May 2016 at 04:05, Julian Calaby <julian.calaby@gmail.com> wrote: >> Hi Michal, >> >> On Fri, May 27, 2016 at 5:25 AM, Michal Suchanek <hramrach@gmail.com> wrote: >>> The trasfer timeout is fixed at 1000 ms. Reading a 4Mbyte flash over >>> 1MHz SPI bus takes way longer than that. Calculate the timeout from the >>> actual time the transfer is supposed to take and multiply by 2 for good >>> measure. >>> >>> Signed-off-by: Michal Suchanek <hramrach@gmail.com> >>> --- >>> >>> v2: >>> - fix build error >>> - use unsigned instead of int in max_t >>> - use tfr->speed_hz instead of sspi->max_speed_hz >>> --- >>> drivers/spi/spi-sun4i.c | 11 ++++++++++- >>> drivers/spi/spi-sun6i.c | 11 ++++++++++- >>> 2 files changed, 20 insertions(+), 2 deletions(-) >>> >>> diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c >>> index 1ddd9e2..fe63bbd 100644 >>> --- a/drivers/spi/spi-sun4i.c >>> +++ b/drivers/spi/spi-sun4i.c >>> @@ -173,6 +173,7 @@ static int sun4i_spi_transfer_one(struct spi_master *master, >>> { >>> struct sun4i_spi *sspi = spi_master_get_devdata(master); >>> unsigned int mclk_rate, div, timeout; >>> + unsigned int start, end, tx_time; >>> unsigned int tx_len = 0; >>> int ret = 0; >>> u32 reg; >>> @@ -279,9 +280,17 @@ static int sun4i_spi_transfer_one(struct spi_master *master, >>> reg = sun4i_spi_read(sspi, SUN4I_CTL_REG); >>> sun4i_spi_write(sspi, SUN4I_CTL_REG, reg | SUN4I_CTL_XCH); >>> >>> + tx_time = max_t(unsigned, tfr->len * 8 * 2 / (tfr->speed_hz / 1000), >> >> You should probably use "unsigned int" instead of just "unsigned" here. >> >>> + 100); > > Or just 100U constant and avoid max_t altogether. > >>> + start = jiffies; >>> timeout = wait_for_completion_timeout(&sspi->done, >>> - msecs_to_jiffies(1000)); >>> + msecs_to_jiffies(tx_time)); >>> + end = jiffies; >>> if (!timeout) { >>> + dev_warn(&master->dev, >>> + "%s: timeout transferring %u bytes@%iHz for %i(%i)ms", >>> + dev_name(&spi->dev), tfr->len, tfr->speed_hz, >>> + jiffies_to_msecs(end - start), tx_time); >> >> Should the debug changes be in a separate patch? > > Is this so big of a change that it needs to be split? Some people get touchy about changes not being mentioned in the commit log. Technically this is two changes: fixing the timeout and adding the timeout debugging, however they're related, so maybe just mention that you've added this debugging in the commit log. > >> >>> ret = -ETIMEDOUT; >>> goto out; >>> } >>> diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c >>> index 42e2c4b..8be5c5c 100644 >>> --- a/drivers/spi/spi-sun6i.c >>> +++ b/drivers/spi/spi-sun6i.c >>> @@ -162,6 +162,7 @@ static int sun6i_spi_transfer_one(struct spi_master *master, >>> unsigned int mclk_rate, div, timeout; >>> unsigned int tx_len = 0; >>> int ret = 0; >>> + unsigned int start, end, tx_time; >>> u32 reg; >>> >>> /* We don't support transfer larger than the FIFO */ >>> @@ -269,9 +270,17 @@ static int sun6i_spi_transfer_one(struct spi_master *master, >>> reg = sun6i_spi_read(sspi, SUN6I_TFR_CTL_REG); >>> sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg | SUN6I_TFR_CTL_XCH); >>> >>> + tx_time = max_t(unsigned, tfr->len * 8 * 2 / (tfr->speed_hz / 1000), >> >> Ditto, "unsigned int" instead of "unsigned"? >> >>> + 100); >>> + start = jiffies; >>> timeout = wait_for_completion_timeout(&sspi->done, >>> - msecs_to_jiffies(1000)); >>> + msecs_to_jiffies(tx_time)); >>> + end = jiffies; >>> if (!timeout) { >>> + dev_warn(&master->dev, >>> + "%s: timeout transferring %u bytes@%iHz for %i(%i)ms", >>> + dev_name(&spi->dev), tfr->len, tfr->speed_hz, >>> + jiffies_to_msecs(end - start), tx_time); >> >> Ditto, separate patch? >> >> Also, should the changes for the drivers be in two separate patches also? > > That's basically the same driver with different constants so I guess not. Fair enough, I withdraw my comment then. Thanks, -- Julian Calaby Email: julian.calaby@gmail.com Profile: http://www.google.com/profiles/julian.calaby/ ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] [PATCH 1/5] spi: sunxi: fix transfer timeout 2016-05-27 5:10 ` Julian Calaby @ 2016-05-30 11:23 ` Mark Brown 2016-05-31 11:52 ` Michal Suchanek 2016-06-01 18:20 ` Maxime Ripard 0 siblings, 2 replies; 28+ messages in thread From: Mark Brown @ 2016-05-30 11:23 UTC (permalink / raw) To: Julian Calaby Cc: Michal Suchanek, linux-sunxi, Maxime Ripard, Chen-Yu Tsai, linux-spi, Mailing List, Arm, linux-kernel [-- Attachment #1: Type: text/plain, Size: 500 bytes --] On Fri, May 27, 2016 at 03:10:11PM +1000, Julian Calaby wrote: > On Fri, May 27, 2016 at 3:05 PM, Michal Suchanek <hramrach@gmail.com> wrote: > >> Also, should the changes for the drivers be in two separate patches also? > > That's basically the same driver with different constants so I guess not. > Fair enough, I withdraw my comment then. If it's the same driver with different constants it should really actually be the same driver - I did ask this when the drivers were originally merged... [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 473 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] [PATCH 1/5] spi: sunxi: fix transfer timeout 2016-05-30 11:23 ` Mark Brown @ 2016-05-31 11:52 ` Michal Suchanek 2016-06-01 18:20 ` Maxime Ripard 1 sibling, 0 replies; 28+ messages in thread From: Michal Suchanek @ 2016-05-31 11:52 UTC (permalink / raw) To: Mark Brown Cc: Julian Calaby, linux-sunxi, Maxime Ripard, Chen-Yu Tsai, linux-spi, Mailing List, Arm, linux-kernel Hello On 30 May 2016 at 13:23, Mark Brown <broonie@kernel.org> wrote: > On Fri, May 27, 2016 at 03:10:11PM +1000, Julian Calaby wrote: >> On Fri, May 27, 2016 at 3:05 PM, Michal Suchanek <hramrach@gmail.com> wrote: > >> >> Also, should the changes for the drivers be in two separate patches also? > >> > That's basically the same driver with different constants so I guess not. > >> Fair enough, I withdraw my comment then. > > If it's the same driver with different constants it should really > actually be the same driver - I did ask this when the drivers were > originally merged... There are some slight differences and the constants really are different for each driver. You would need a register remap adaptation layer and a few qirks for each revision of the driver. It's certainly possible to merge them but I am not sure if that gives easier to maintain code. On the other hand, comparing the drivers there is different comment anout clock calculation arithmetic and the code is the same :S Thanks Michal --- spi-sun4i.c 2016-05-31 13:19:27.076510421 +0200 +++ spi-sun6i.c 2016-05-31 13:26:58.123580382 +0200 @@ -19,65 +19,72 @@ #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> +#include <linux/reset.h> #include <linux/spi/spi.h> -#define SUNXI_FIFO_DEPTH 64 +#define SUNXI_FIFO_DEPTH 128 -#define SUNXI_RXDATA_REG 0x00 +#define SUNXI_TXDATA_REG 0x200 -#define SUNXI_TXDATA_REG 0x04 +#define SUNXI_RXDATA_REG 0x300 #define SUNXI_TFR_CTL_REG 0x08 -#define SUNXI_TFR_CTL_ENABLE BIT(0) -#define SUNXI_TFR_CTL_MASTER BIT(1) -#define SUNXI_TFR_CTL_CPHA BIT(2) -#define SUNXI_TFR_CTL_CPOL BIT(3) -#define SUNXI_TFR_CTL_CS_ACTIVE_LOW BIT(4) -#define SUNXI_TFR_CTL_LMTF BIT(6) -#define SUNXI_TFR_CTL_TF_RST BIT(8) -#define SUNXI_TFR_CTL_RF_RST BIT(9) -#define SUNXI_TFR_CTL_XCH BIT(10) -#define SUNXI_TFR_CTL_CS_MASK 0x3000 -#define SUNXI_TFR_CTL_CS(cs) (((cs) << 12) & SUNXI_TFR_CTL_CS_MASK) -#define SUNXI_TFR_CTL_DHB BIT(15) -#define SUNXI_TFR_CTL_CS_MANUAL BIT(16) -#define SUNXI_TFR_CTL_CS_LEVEL BIT(17) -#define SUNXI_TFR_CTL_TP BIT(18) +#define SUNXI_TFR_CTL_CPHA BIT(0) +#define SUNXI_TFR_CTL_CPOL BIT(1) +#define SUNXI_TFR_CTL_SPOL BIT(2) +#define SUNXI_TFR_CTL_CS_MASK 0x30 +#define SUNXI_TFR_CTL_CS(cs) (((cs) << 4) & SUNXI_TFR_CTL_CS_MASK) +#define SUNXI_TFR_CTL_CS_MANUAL BIT(6) +#define SUNXI_TFR_CTL_CS_LEVEL BIT(7) +#define SUNXI_TFR_CTL_DHB BIT(8) +#define SUNXI_TFR_CTL_FBS BIT(12) +#define SUNXI_TFR_CTL_XCH BIT(31) -#define SUNXI_INT_CTL_REG 0x0c -#define SUNXI_INT_CTL_TC BIT(16) +#define SUNXI_INT_CTL_REG 0x10 +#define SUNXI_INT_CTL_RF_OVF BIT(8) +#define SUNXI_INT_CTL_TC BIT(12) -#define SUNXI_INT_STA_REG 0x10 +#define SUNXI_INT_STA_REG 0x14 -#define SUNXI_DMA_CTL_REG 0x14 +#define SUNXI_FIFO_CTL_REG 0x18 +#define SUNXI_FIFO_CTL_RF_RST BIT(15) +#define SUNXI_FIFO_CTL_TF_RST BIT(31) -#define SUNXI_CLK_CTL_REG 0x1c +#define SUNXI_CLK_CTL_REG 0x24 #define SUNXI_CLK_CTL_CDR2_MASK 0xff #define SUNXI_CLK_CTL_CDR2(div) (((div) & SUNXI_CLK_CTL_CDR2_MASK) << 0) #define SUNXI_CLK_CTL_CDR1_MASK 0xf #define SUNXI_CLK_CTL_CDR1(div) (((div) & SUNXI_CLK_CTL_CDR1_MASK) << 8) #define SUNXI_CLK_CTL_DRS BIT(12) -#define SUNXI_BURST_CNT_REG 0x20 +#define SUNXI_BURST_CNT_REG 0x30 #define SUNXI_BURST_CNT(cnt) ((cnt) & 0xffffff) -#define SUNXI_XMIT_CNT_REG 0x24 +#define SUNXI_XMIT_CNT_REG 0x34 #define SUNXI_XMIT_CNT(cnt) ((cnt) & 0xffffff) -#define SUNXI_FIFO_STA_REG 0x28 +#define SUNXI_FIFO_STA_REG 0x1c #define SUNXI_FIFO_STA_RF_CNT_MASK 0x7f #define SUNXI_FIFO_STA_RF_CNT_BITS 0 #define SUNXI_FIFO_STA_TF_CNT_MASK 0x7f #define SUNXI_FIFO_STA_TF_CNT_BITS 16 -#define SUNXI_WAIT_REG 0x18 +#define SUNXI_BURST_CTL_CNT_REG 0x38 +#define SUNXI_BURST_CTL_CNT_STC(cnt) ((cnt) & 0xffffff) + +#define SUNXI_GBL_CTL_REG 0x04 +#define SUNXI_GBL_CTL_BUS_ENABLE BIT(0) +#define SUNXI_GBL_CTL_MASTER BIT(1) +#define SUNXI_GBL_CTL_TP BIT(7) +#define SUNXI_GBL_CTL_RST BIT(31) struct sunxi_spi { struct spi_master *master; void __iomem *base_addr; struct clk *hclk; struct clk *mclk; + struct reset_control *rstc; struct completion done; @@ -136,37 +143,18 @@ u32 reg; reg = sunxi_spi_read(sspi, SUNXI_TFR_CTL_REG); - reg &= ~SUNXI_TFR_CTL_CS_MASK; reg |= SUNXI_TFR_CTL_CS(spi->chip_select); - /* We want to control the chip select manually */ - reg |= SUNXI_TFR_CTL_CS_MANUAL; - if (enable) reg |= SUNXI_TFR_CTL_CS_LEVEL; else reg &= ~SUNXI_TFR_CTL_CS_LEVEL; - /* - * Even though this looks irrelevant since we are supposed to - * be controlling the chip select manually, this bit also - * controls the levels of the chip select for inactive - * devices. - * - * If we don't set it, the chip select level will go low by - * default when the device is idle, which is not really - * expected in the common case where the chip select is active - * low. - */ - if (spi->mode & SPI_CS_HIGH) - reg &= ~SUNXI_TFR_CTL_CS_ACTIVE_LOW; - else - reg |= SUNXI_TFR_CTL_CS_ACTIVE_LOW; - sunxi_spi_write(sspi, SUNXI_TFR_CTL_REG, reg); } + static int sunxi_spi_transfer_one(struct spi_master *master, struct spi_device *spi, struct spi_transfer *tfr) @@ -189,17 +177,16 @@ /* Clear pending interrupts */ sunxi_spi_write(sspi, SUNXI_INT_STA_REG, ~0); - - reg = sunxi_spi_read(sspi, SUNXI_TFR_CTL_REG); - /* Reset FIFOs */ - sunxi_spi_write(sspi, SUNXI_TFR_CTL_REG, - reg | SUNXI_TFR_CTL_RF_RST | SUNXI_TFR_CTL_TF_RST); + sunxi_spi_write(sspi, SUNXI_FIFO_CTL_REG, + SUNXI_FIFO_CTL_RF_RST | SUNXI_FIFO_CTL_TF_RST); /* * Setup the transfer control register: Chip Select, * polarities, etc. */ + reg = sunxi_spi_read(sspi, SUNXI_TFR_CTL_REG); + if (spi->mode & SPI_CPOL) reg |= SUNXI_TFR_CTL_CPOL; else @@ -211,10 +198,9 @@ reg &= ~SUNXI_TFR_CTL_CPHA; if (spi->mode & SPI_LSB_FIRST) - reg |= SUNXI_TFR_CTL_LMTF; + reg |= SUNXI_TFR_CTL_FBS; else - reg &= ~SUNXI_TFR_CTL_LMTF; - + reg &= ~SUNXI_TFR_CTL_FBS; /* * If it's a TX only transfer, we don't want to fill the RX @@ -225,6 +211,9 @@ else reg |= SUNXI_TFR_CTL_DHB; + /* We want to control the chip select manually */ + reg |= SUNXI_TFR_CTL_CS_MANUAL; + sunxi_spi_write(sspi, SUNXI_TFR_CTL_REG, reg); /* Ensure that we have a parent clock fast enough */ @@ -239,7 +228,7 @@ * * We have two choices there. Either we can use the clock * divide rate 1, which is calculated thanks to this formula: - * SPI_CLK = MOD_CLK / (2 ^ (cdr + 1)) + * SPI_CLK = MOD_CLK / (2 ^ cdr) * Or we can use CDR2, which is calculated with the formula: * SPI_CLK = MOD_CLK / (2 * (cdr + 1)) * Wether we use the former or the latter is set through the @@ -268,6 +257,8 @@ /* Setup the counters */ sunxi_spi_write(sspi, SUNXI_BURST_CNT_REG, SUNXI_BURST_CNT(tfr->len)); sunxi_spi_write(sspi, SUNXI_XMIT_CNT_REG, SUNXI_XMIT_CNT(tx_len)); + sunxi_spi_write(sspi, SUNXI_BURST_CTL_CNT_REG, + SUNXI_BURST_CTL_CNT_STC(tx_len)); /* Fill the TX FIFO */ sunxi_spi_fill_fifo(sspi, SUNXI_FIFO_DEPTH); @@ -327,11 +318,19 @@ goto err; } - sunxi_spi_write(sspi, SUNXI_TFR_CTL_REG, - SUNXI_TFR_CTL_ENABLE | SUNXI_TFR_CTL_MASTER | SUNXI_TFR_CTL_TP); + ret = reset_control_deassert(sspi->rstc); + if (ret) { + dev_err(dev, "Couldn't deassert the device from reset\n"); + goto err2; + } + + sunxi_spi_write(sspi, SUNXI_GBL_CTL_REG, + SUNXI_GBL_CTL_BUS_ENABLE | SUNXI_GBL_CTL_MASTER | SUNXI_GBL_CTL_TP); return 0; +err2: + clk_disable_unprepare(sspi->mclk); err: clk_disable_unprepare(sspi->hclk); out: @@ -343,6 +342,7 @@ struct spi_master *master = dev_get_drvdata(dev); struct sunxi_spi *sspi = spi_master_get_devdata(master); + reset_control_assert(sspi->rstc); clk_disable_unprepare(sspi->mclk); clk_disable_unprepare(sspi->hclk); @@ -411,6 +411,13 @@ init_completion(&sspi->done); + sspi->rstc = devm_reset_control_get(&pdev->dev, NULL); + if (IS_ERR(sspi->rstc)) { + dev_err(&pdev->dev, "Couldn't get reset controller\n"); + ret = PTR_ERR(sspi->rstc); + goto err_free_master; + } + /* * This wake-up/shutdown pattern is to be able to have the * device woken up, even if runtime_pm is disabled @@ -449,7 +456,7 @@ } static const struct of_device_id sunxi_spi_match[] = { - { .compatible = "allwinner,sun4i-a10-spi", }, + { .compatible = "allwinner,sun6i-a31-spi", }, {} }; MODULE_DEVICE_TABLE(of, sunxi_spi_match); @@ -472,5 +479,5 @@ MODULE_AUTHOR("Pan Nan <pannan@allwinnertech.com>"); MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>"); -MODULE_DESCRIPTION("Allwinner A1X/A20 SPI controller driver"); +MODULE_DESCRIPTION("Allwinner A31 SPI controller driver"); MODULE_LICENSE("GPL"); ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] [PATCH 1/5] spi: sunxi: fix transfer timeout 2016-05-30 11:23 ` Mark Brown 2016-05-31 11:52 ` Michal Suchanek @ 2016-06-01 18:20 ` Maxime Ripard 1 sibling, 0 replies; 28+ messages in thread From: Maxime Ripard @ 2016-06-01 18:20 UTC (permalink / raw) To: Mark Brown Cc: Julian Calaby, Michal Suchanek, linux-sunxi, Chen-Yu Tsai, linux-spi, Mailing List, Arm, linux-kernel [-- Attachment #1: Type: text/plain, Size: 1638 bytes --] Hi Mark, On Mon, May 30, 2016 at 12:23:50PM +0100, Mark Brown wrote: > On Fri, May 27, 2016 at 03:10:11PM +1000, Julian Calaby wrote: > > On Fri, May 27, 2016 at 3:05 PM, Michal Suchanek <hramrach@gmail.com> wrote: > > > >> Also, should the changes for the drivers be in two separate patches also? > > > > That's basically the same driver with different constants so I guess not. > > > Fair enough, I withdraw my comment then. > > If it's the same driver with different constants it should really > actually be the same driver - I did ask this when the drivers were > originally merged... I think we already had this discussion a few times :) The thing is that the SPI framework now deals pretty well with the SPI controllers, and you basically only have the probe function and how to start a transfer. Which is nice. However, the sun4i and sun6i SPI controllers have very significant register layout differences: the registers offset are different, some registers in the sun4i have been split in several in the sun6i. So while I concur that they look alike, merging the two in a single driver would complicate a lot the code, while we would not be able to share most of the code, so I am really not sure it's worth it. Where the issue really lies is that they've been both written at the same time, and share the same flaws, especially in their probe method. But that's not really related to the controller itself, but more because the code has been close to copy/pasted. Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 819 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 1/5] spi: sunxi: fix transfer timeout [not found] ` <cb90b922caa6ac07c1425d726ea19709ee5284f4.1464130597.git.hramrach@gmail.com> 2016-05-27 2:05 ` [linux-sunxi] [PATCH 1/5] spi: sunxi: fix transfer timeout Julian Calaby @ 2016-05-30 9:44 ` Maxime Ripard 1 sibling, 0 replies; 28+ messages in thread From: Maxime Ripard @ 2016-05-30 9:44 UTC (permalink / raw) To: Michal Suchanek Cc: linux-sunxi, Mark Brown, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 683 bytes --] On Thu, May 26, 2016 at 07:25:23PM -0000, Michal Suchanek wrote: > The trasfer timeout is fixed at 1000 ms. Reading a 4Mbyte flash over > 1MHz SPI bus takes way longer than that. Calculate the timeout from the > actual time the transfer is supposed to take and multiply by 2 for good > measure. > > Signed-off-by: Michal Suchanek <hramrach@gmail.com> > --- > > v2: > - fix build error > - use unsigned instead of int in max_t And this generates warnings in checkpatch. Please make sure that you run it before submitting any patches. Thanks! Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 819 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
[parent not found: <ba0d6eb37cc4b0d2c46acbf9fcd7d644b3545ce8.1464130597.git.hramrach@gmail.com>]
* Re: [PATCH 5/5] RFC spi: sun4i: add DMA support [not found] ` <ba0d6eb37cc4b0d2c46acbf9fcd7d644b3545ce8.1464130597.git.hramrach@gmail.com> @ 2016-05-30 11:26 ` Mark Brown 2016-05-30 12:11 ` Geert Uytterhoeven 0 siblings, 1 reply; 28+ messages in thread From: Mark Brown @ 2016-05-30 11:26 UTC (permalink / raw) To: Michal Suchanek Cc: linux-sunxi, Maxime Ripard, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 419 bytes --] On Thu, May 26, 2016 at 07:25:25PM -0000, Michal Suchanek wrote: > - fallback to previous behaviour when DMA initialization fails > > + this has the problem that when the driver happens to load before the dma > driver it will not use dma - can be addressed with a module parameter No, you should pay attention to the error you are getting and let probe deferral happen if that's the error you get. [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 473 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-05-30 11:26 ` [PATCH 5/5] RFC spi: sun4i: add DMA support Mark Brown @ 2016-05-30 12:11 ` Geert Uytterhoeven 2016-05-30 15:03 ` Mark Brown 0 siblings, 1 reply; 28+ messages in thread From: Geert Uytterhoeven @ 2016-05-30 12:11 UTC (permalink / raw) To: Mark Brown Cc: Michal Suchanek, linux-sunxi, Maxime Ripard, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel Hi Mark, On Mon, May 30, 2016 at 1:26 PM, Mark Brown <broonie@kernel.org> wrote: > On Thu, May 26, 2016 at 07:25:25PM -0000, Michal Suchanek wrote: >> - fallback to previous behaviour when DMA initialization fails >> >> + this has the problem that when the driver happens to load before the dma >> driver it will not use dma - can be addressed with a module parameter > > No, you should pay attention to the error you are getting and let probe > deferral happen if that's the error you get. Unfortunately DMA is an optional feature. There's no way to distinguish between -EPROBE_DEFER due to the SPI master driver being probed before the DMA engine driver, and -EPROBE_DEFER due to support for the DMA engine not having been compiled in. Gr{oetje,eeting}s, Geert -- Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org In personal conversations with technical people, I call myself a hacker. But when I'm talking to journalists I just say "programmer" or something like that. -- Linus Torvalds ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-05-30 12:11 ` Geert Uytterhoeven @ 2016-05-30 15:03 ` Mark Brown 2016-05-30 15:28 ` Michal Suchanek 0 siblings, 1 reply; 28+ messages in thread From: Mark Brown @ 2016-05-30 15:03 UTC (permalink / raw) To: Geert Uytterhoeven Cc: Michal Suchanek, linux-sunxi, Maxime Ripard, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 1365 bytes --] On Mon, May 30, 2016 at 02:11:51PM +0200, Geert Uytterhoeven wrote: > On Mon, May 30, 2016 at 1:26 PM, Mark Brown <broonie@kernel.org> wrote: > > On Thu, May 26, 2016 at 07:25:25PM -0000, Michal Suchanek wrote: > >> - fallback to previous behaviour when DMA initialization fails > >> > >> + this has the problem that when the driver happens to load before the dma > >> driver it will not use dma - can be addressed with a module parameter > > No, you should pay attention to the error you are getting and let probe > > deferral happen if that's the error you get. > Unfortunately DMA is an optional feature. > There's no way to distinguish between -EPROBE_DEFER due to the SPI master > driver being probed before the DMA engine driver, and -EPROBE_DEFER due to > support for the DMA engine not having been compiled in. I really don't think it's worth caring too much about cases where the DMA driver hasn't been compiled in, it's not like SPI is the only thing that's going to be using it. I really think it's better to defer the problem - not getting DMA (or worse, only getting DMA on some boots) is not great and if people are optimising on that level my feeling is that they're probably going to be OK with customizing DT to match. Ideally we would have something a bit nicer than deferred probe but right now this seems the more helpful option. [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 473 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-05-30 15:03 ` Mark Brown @ 2016-05-30 15:28 ` Michal Suchanek 2016-05-30 15:50 ` Mark Brown 0 siblings, 1 reply; 28+ messages in thread From: Michal Suchanek @ 2016-05-30 15:28 UTC (permalink / raw) To: Mark Brown Cc: Geert Uytterhoeven, linux-sunxi, Maxime Ripard, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel Hello, On 30 May 2016 at 17:03, Mark Brown <broonie@kernel.org> wrote: > On Mon, May 30, 2016 at 02:11:51PM +0200, Geert Uytterhoeven wrote: >> On Mon, May 30, 2016 at 1:26 PM, Mark Brown <broonie@kernel.org> wrote: >> > On Thu, May 26, 2016 at 07:25:25PM -0000, Michal Suchanek wrote: >> >> - fallback to previous behaviour when DMA initialization fails >> >> >> >> + this has the problem that when the driver happens to load before the dma >> >> driver it will not use dma - can be addressed with a module parameter > >> > No, you should pay attention to the error you are getting and let probe >> > deferral happen if that's the error you get. > >> Unfortunately DMA is an optional feature. > >> There's no way to distinguish between -EPROBE_DEFER due to the SPI master >> driver being probed before the DMA engine driver, and -EPROBE_DEFER due to >> support for the DMA engine not having been compiled in. > > I really don't think it's worth caring too much about cases where the > DMA driver hasn't been compiled in, it's not like SPI is the only thing > that's going to be using it. I really think it's better to defer the > problem - not getting DMA (or worse, only getting DMA on some boots) is > not great and if people are optimising on that level my feeling is that > they're probably going to be OK with customizing DT to match. Ideally > we would have something a bit nicer than deferred probe but right now > this seems the more helpful option. It's what the driver did to start with and it was requested to fall back to non-DMA in the case DMA is not available. We get to the much discussed problem that it's never possible to tell if a driver is available or not. It's possible to add a parameter like require_dma which could be used to load the driver without dma if unset. If it was set by default then driver ordering is not important so long as dma driver is loaded eventually. Also an informative print that such parameter exists when probing the driver is deferred would be helpful. It would probably create quite a bit of log spam, however. The driver can be deferred several times during boot. Thanks Michal ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-05-30 15:28 ` Michal Suchanek @ 2016-05-30 15:50 ` Mark Brown 2016-05-31 10:44 ` Michal Suchanek 2016-06-01 18:00 ` Maxime Ripard 0 siblings, 2 replies; 28+ messages in thread From: Mark Brown @ 2016-05-30 15:50 UTC (permalink / raw) To: Michal Suchanek Cc: Geert Uytterhoeven, linux-sunxi, Maxime Ripard, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 1509 bytes --] On Mon, May 30, 2016 at 05:28:10PM +0200, Michal Suchanek wrote: > On 30 May 2016 at 17:03, Mark Brown <broonie@kernel.org> wrote: > > I really don't think it's worth caring too much about cases where the > > DMA driver hasn't been compiled in, it's not like SPI is the only thing > It's what the driver did to start with and it was requested to fall > back to non-DMA in the case DMA is not available. Why? I really can't see any sensible use case for this that doesn't have a better solution available. > It's possible to add a parameter like require_dma which could be used > to load the driver without dma if unset. If it was set by default then > driver ordering is not important so long as dma driver is loaded > eventually. Also an informative print that such parameter exists when > probing the driver is deferred would be helpful. It would probably > create quite a bit of log spam, however. The driver can be deferred > several times during boot. That seems fairly hacky, if we were going to do anything like that it should be the other way around so that we default to trying to use resources and even then it seems like something that should be handled at a framework level rather than having random options in individual drivers to ignore things. Having things behave inconsistently between different drivers is going to lead to a worse user experience and if this is a good idea for one driver it seems like it'd be a good idea for all of them. But really [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 473 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-05-30 15:50 ` Mark Brown @ 2016-05-31 10:44 ` Michal Suchanek 2016-05-31 13:27 ` Mark Brown 2016-06-01 18:00 ` Maxime Ripard 1 sibling, 1 reply; 28+ messages in thread From: Michal Suchanek @ 2016-05-31 10:44 UTC (permalink / raw) To: Mark Brown Cc: Geert Uytterhoeven, linux-sunxi, Maxime Ripard, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel On 30 May 2016 at 17:50, Mark Brown <broonie@kernel.org> wrote: > On Mon, May 30, 2016 at 05:28:10PM +0200, Michal Suchanek wrote: >> On 30 May 2016 at 17:03, Mark Brown <broonie@kernel.org> wrote: > >> > I really don't think it's worth caring too much about cases where the >> > DMA driver hasn't been compiled in, it's not like SPI is the only thing > >> It's what the driver did to start with and it was requested to fall >> back to non-DMA in the case DMA is not available. > > Why? I really can't see any sensible use case for this that doesn't > have a better solution available. Of course, the solution is to compile in the DMA driver. It's been argued that some drivers which use only short transfers will just work. > >> It's possible to add a parameter like require_dma which could be used >> to load the driver without dma if unset. If it was set by default then >> driver ordering is not important so long as dma driver is loaded >> eventually. Also an informative print that such parameter exists when >> probing the driver is deferred would be helpful. It would probably >> create quite a bit of log spam, however. The driver can be deferred >> several times during boot. > > That seems fairly hacky, if we were going to do anything like that it > should be the other way around so that we default to trying to use > resources and even then it seems like something that should be handled > at a framework level rather than having random options in individual > drivers to ignore things. Having things behave inconsistently between > different drivers is going to lead to a worse user experience and if > this is a good idea for one driver it seems like it'd be a good idea for > all of them. Hacky but doable if desirable. It's awesome for testing SPI transfer fragmentation with different drivers ;-) The previous discussion of this driver is here http://thread.gmane.org/gmane.linux.kernel/2162327 Thanks Michal ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-05-31 10:44 ` Michal Suchanek @ 2016-05-31 13:27 ` Mark Brown 2016-05-31 14:19 ` Michal Suchanek 0 siblings, 1 reply; 28+ messages in thread From: Mark Brown @ 2016-05-31 13:27 UTC (permalink / raw) To: Michal Suchanek Cc: Geert Uytterhoeven, linux-sunxi, Maxime Ripard, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 737 bytes --] On Tue, May 31, 2016 at 12:44:54PM +0200, Michal Suchanek wrote: > On 30 May 2016 at 17:50, Mark Brown <broonie@kernel.org> wrote: > > On Mon, May 30, 2016 at 05:28:10PM +0200, Michal Suchanek wrote: > >> It's what the driver did to start with and it was requested to fall > >> back to non-DMA in the case DMA is not available. > > Why? I really can't see any sensible use case for this that doesn't > > have a better solution available. > Of course, the solution is to compile in the DMA driver. > It's been argued that some drivers which use only short transfers will > just work. With nothing else in the system that needs DMA? It's making the performance of the system less reliable for the benefit of a very narrow use case. [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 473 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-05-31 13:27 ` Mark Brown @ 2016-05-31 14:19 ` Michal Suchanek 2016-06-02 8:18 ` Maxime Ripard 0 siblings, 1 reply; 28+ messages in thread From: Michal Suchanek @ 2016-05-31 14:19 UTC (permalink / raw) To: Mark Brown Cc: Geert Uytterhoeven, linux-sunxi, Maxime Ripard, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel On 31 May 2016 at 15:27, Mark Brown <broonie@kernel.org> wrote: > On Tue, May 31, 2016 at 12:44:54PM +0200, Michal Suchanek wrote: >> On 30 May 2016 at 17:50, Mark Brown <broonie@kernel.org> wrote: >> > On Mon, May 30, 2016 at 05:28:10PM +0200, Michal Suchanek wrote: > >> >> It's what the driver did to start with and it was requested to fall >> >> back to non-DMA in the case DMA is not available. > >> > Why? I really can't see any sensible use case for this that doesn't >> > have a better solution available. > >> Of course, the solution is to compile in the DMA driver. > >> It's been argued that some drivers which use only short transfers will >> just work. > > With nothing else in the system that needs DMA? It's making the > performance of the system less reliable for the benefit of a very narrow > use case. Some of the platform devices have dedicated DMA *controller* built into the device IP so the DMA engine really is optional on many sunxi devices. Besides SPI you definitely need the DMA engine for audio. You probably don't need it for storage and graphics. I don't have any idea if it's used for USB and Ethernet. Thanks Michal ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-05-31 14:19 ` Michal Suchanek @ 2016-06-02 8:18 ` Maxime Ripard 0 siblings, 0 replies; 28+ messages in thread From: Maxime Ripard @ 2016-06-02 8:18 UTC (permalink / raw) To: Michal Suchanek Cc: Mark Brown, Geert Uytterhoeven, linux-sunxi, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 1528 bytes --] On Tue, May 31, 2016 at 04:19:28PM +0200, Michal Suchanek wrote: > On 31 May 2016 at 15:27, Mark Brown <broonie@kernel.org> wrote: > > On Tue, May 31, 2016 at 12:44:54PM +0200, Michal Suchanek wrote: > >> On 30 May 2016 at 17:50, Mark Brown <broonie@kernel.org> wrote: > >> > On Mon, May 30, 2016 at 05:28:10PM +0200, Michal Suchanek wrote: > > > >> >> It's what the driver did to start with and it was requested to fall > >> >> back to non-DMA in the case DMA is not available. > > > >> > Why? I really can't see any sensible use case for this that doesn't > >> > have a better solution available. > > > >> Of course, the solution is to compile in the DMA driver. > > > >> It's been argued that some drivers which use only short transfers will > >> just work. > > > > With nothing else in the system that needs DMA? It's making the > > performance of the system less reliable for the benefit of a very narrow > > use case. > > Some of the platform devices have dedicated DMA *controller* built > into the device IP so the DMA engine really is optional on many sunxi > devices. Besides SPI you definitely need the DMA engine for audio. You > probably don't need it for storage and graphics. I don't have any idea > if it's used for USB and Ethernet. USB and Ethernet have their own dedicated DMA engines. So currently, the only driver that requires it is the audio codec. Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 819 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-05-30 15:50 ` Mark Brown 2016-05-31 10:44 ` Michal Suchanek @ 2016-06-01 18:00 ` Maxime Ripard 2016-06-02 4:42 ` [linux-sunxi] " Priit Laes 1 sibling, 1 reply; 28+ messages in thread From: Maxime Ripard @ 2016-06-01 18:00 UTC (permalink / raw) To: Mark Brown Cc: Michal Suchanek, Geert Uytterhoeven, linux-sunxi, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 1064 bytes --] Hi, On Mon, May 30, 2016 at 04:50:16PM +0100, Mark Brown wrote: > On Mon, May 30, 2016 at 05:28:10PM +0200, Michal Suchanek wrote: > > On 30 May 2016 at 17:03, Mark Brown <broonie@kernel.org> wrote: > > > > I really don't think it's worth caring too much about cases where the > > > DMA driver hasn't been compiled in, it's not like SPI is the only thing > > > It's what the driver did to start with and it was requested to fall > > back to non-DMA in the case DMA is not available. > > Why? I really can't see any sensible use case for this that doesn't > have a better solution available. SPI works just fine without DMA, which might just be considered an (optional) optimisation. We've been using it without DMA for years now, and it was working just fine, and it will work even better with the other patches in this serie. There's no reason to add a hard dependency on something that we don't really need. Maxime -- Maxime Ripard, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 819 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-06-01 18:00 ` Maxime Ripard @ 2016-06-02 4:42 ` Priit Laes 2016-06-02 9:18 ` Mark Brown 2016-06-02 12:14 ` Michal Suchanek 0 siblings, 2 replies; 28+ messages in thread From: Priit Laes @ 2016-06-02 4:42 UTC (permalink / raw) To: maxime.ripard, Mark Brown Cc: Michal Suchanek, Geert Uytterhoeven, linux-sunxi, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel On Wed, 2016-06-01 at 20:00 +0200, Maxime Ripard wrote: > Hi, > > On Mon, May 30, 2016 at 04:50:16PM +0100, Mark Brown wrote: > > > > On Mon, May 30, 2016 at 05:28:10PM +0200, Michal Suchanek wrote: > > > > > > On 30 May 2016 at 17:03, Mark Brown <broonie@kernel.org> wrote: > > > > > > > > > > > I really don't think it's worth caring too much about cases > > > > where the > > > > DMA driver hasn't been compiled in, it's not like SPI is the > > > > only thing > > > > > > It's what the driver did to start with and it was requested to > > > fall > > > back to non-DMA in the case DMA is not available. > > Why? I really can't see any sensible use case for this that > > doesn't > > have a better solution available. > SPI works just fine without DMA, which might just be considered an > (optional) optimisation. > > We've been using it without DMA for years now, and it was working > just > fine, and it will work even better with the other patches in this > serie. There's no reason to add a hard dependency on something that > we > don't really need. > Actually it non-DMA case works fine if you don't need SPI transfers larger than SUN4I_FIFO_DEPTH - 1, which is 63 bytes. This was addressed by this patch, but was never applied: http://permalink.gmane.org/gmane.linux.kernel.spi.devel/18950 ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-06-02 4:42 ` [linux-sunxi] " Priit Laes @ 2016-06-02 9:18 ` Mark Brown 2016-06-02 12:14 ` Michal Suchanek 1 sibling, 0 replies; 28+ messages in thread From: Mark Brown @ 2016-06-02 9:18 UTC (permalink / raw) To: Priit Laes Cc: maxime.ripard, Michal Suchanek, Geert Uytterhoeven, linux-sunxi, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 411 bytes --] On Thu, Jun 02, 2016 at 07:42:26AM +0300, Priit Laes wrote: > This was addressed by this patch, but was never applied: > http://permalink.gmane.org/gmane.linux.kernel.spi.devel/18950 I've never seen that patch before, if it was CCed to me there's a good chance it'd have been deleted unread because you put ARM: at the start of the subject line which says it's a patch for arch/arm. You'll need to resubmit. [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 473 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-06-02 4:42 ` [linux-sunxi] " Priit Laes 2016-06-02 9:18 ` Mark Brown @ 2016-06-02 12:14 ` Michal Suchanek 2016-06-02 14:26 ` Mark Brown 1 sibling, 1 reply; 28+ messages in thread From: Michal Suchanek @ 2016-06-02 12:14 UTC (permalink / raw) To: Priit Laes Cc: Maxime Ripard, Mark Brown, Geert Uytterhoeven, linux-sunxi, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel On 2 June 2016 at 06:42, Priit Laes <plaes@plaes.org> wrote: > On Wed, 2016-06-01 at 20:00 +0200, Maxime Ripard wrote: >> Hi, >> >> On Mon, May 30, 2016 at 04:50:16PM +0100, Mark Brown wrote: >> > >> > On Mon, May 30, 2016 at 05:28:10PM +0200, Michal Suchanek wrote: >> > > >> > > On 30 May 2016 at 17:03, Mark Brown <broonie@kernel.org> wrote: >> > > >> > > > >> > > > I really don't think it's worth caring too much about cases >> > > > where the >> > > > DMA driver hasn't been compiled in, it's not like SPI is the >> > > > only thing >> > > >> > > It's what the driver did to start with and it was requested to >> > > fall >> > > back to non-DMA in the case DMA is not available. >> > Why? I really can't see any sensible use case for this that >> > doesn't >> > have a better solution available. >> SPI works just fine without DMA, which might just be considered an >> (optional) optimisation. >> >> We've been using it without DMA for years now, and it was working >> just >> fine, and it will work even better with the other patches in this >> serie. There's no reason to add a hard dependency on something that >> we >> don't really need. >> > > Actually it non-DMA case works fine if you don't need SPI transfers > larger than SUN4I_FIFO_DEPTH - 1, which is 63 bytes. > > This was addressed by this patch, but was never applied: > http://permalink.gmane.org/gmane.linux.kernel.spi.devel/18950 And the code added in that patch will never run unless you 1) use long spi transfers 2) compile in/load SPI without DMA support There is no reason for doing 2) since we have do DMA support for sunxi. So that's another code path that needs maintenance and testing and likely will not get it. Thanks Michal ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-06-02 12:14 ` Michal Suchanek @ 2016-06-02 14:26 ` Mark Brown 2016-06-05 11:27 ` Michal Suchanek 0 siblings, 1 reply; 28+ messages in thread From: Mark Brown @ 2016-06-02 14:26 UTC (permalink / raw) To: Michal Suchanek Cc: Priit Laes, Maxime Ripard, Geert Uytterhoeven, linux-sunxi, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 1358 bytes --] On Thu, Jun 02, 2016 at 02:14:26PM +0200, Michal Suchanek wrote: > On 2 June 2016 at 06:42, Priit Laes <plaes@plaes.org> wrote: > > On Wed, 2016-06-01 at 20:00 +0200, Maxime Ripard wrote: > > Actually it non-DMA case works fine if you don't need SPI transfers > > larger than SUN4I_FIFO_DEPTH - 1, which is 63 bytes. > > This was addressed by this patch, but was never applied: > > http://permalink.gmane.org/gmane.linux.kernel.spi.devel/18950 > And the code added in that patch will never run unless you > 1) use long spi transfers > 2) compile in/load SPI without DMA support > There is no reason for doing 2) since we have do DMA support for sunxi. Well, presumably such code exists and is being worked on? > So that's another code path that needs maintenance and testing and > likely will not get it. Oh, come on. You might not want to use it yourself but the chances are that someone will want to use it just like the situation with all the other SPI drivers. It's a perfectly reasonable and sensible feature to support upstream. I really do not understand why there is such a strong desire to have these devices be a special snowflake here, the worst that's likely to happen here is that you're going to end up having to either remove the DMA controller from the DT or load the driver for it neither of which seem like the end of the world. [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 473 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-06-02 14:26 ` Mark Brown @ 2016-06-05 11:27 ` Michal Suchanek 2016-06-06 11:36 ` Mark Brown 0 siblings, 1 reply; 28+ messages in thread From: Michal Suchanek @ 2016-06-05 11:27 UTC (permalink / raw) To: Mark Brown Cc: Priit Laes, Maxime Ripard, Geert Uytterhoeven, linux-sunxi, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel On 2 June 2016 at 16:26, Mark Brown <broonie@kernel.org> wrote: > On Thu, Jun 02, 2016 at 02:14:26PM +0200, Michal Suchanek wrote: >> On 2 June 2016 at 06:42, Priit Laes <plaes@plaes.org> wrote: >> > On Wed, 2016-06-01 at 20:00 +0200, Maxime Ripard wrote: > >> > Actually it non-DMA case works fine if you don't need SPI transfers >> > larger than SUN4I_FIFO_DEPTH - 1, which is 63 bytes. > >> > This was addressed by this patch, but was never applied: >> > http://permalink.gmane.org/gmane.linux.kernel.spi.devel/18950 > >> And the code added in that patch will never run unless you > >> 1) use long spi transfers >> 2) compile in/load SPI without DMA support > >> There is no reason for doing 2) since we have do DMA support for sunxi. > > Well, presumably such code exists and is being worked on? Which code are you referring to? This is a reply to patch which adds DMA support to the SPI driver so that it can work for arbitrarily long transfers. So there is code for fully working driver. > >> So that's another code path that needs maintenance and testing and >> likely will not get it. > > Oh, come on. You might not want to use it yourself but the chances are > that someone will want to use it just like the situation with all the > other SPI drivers. It's a perfectly reasonable and sensible feature to > support upstream. Is it? Once we have *one* driver that works for arbitrarily long transfers and it works out of the box with the board defconfig 99% of people who will use the SPI driver for anything will use this driver. Any other variant will go untested. And for the driver to also work without DMA you have to *tell* it to probe without DMA because it cannot know you are not going to load a DMA driver later. > > I really do not understand why there is such a strong desire to have > these devices be a special snowflake here, the worst that's likely to > happen here is that you're going to end up having to either remove the > DMA controller from the DT or load the driver for it neither of which > seem like the end of the world. Why would you do that? Thanks Michal ^ permalink raw reply [flat|nested] 28+ messages in thread
* Re: [linux-sunxi] Re: [PATCH 5/5] RFC spi: sun4i: add DMA support 2016-06-05 11:27 ` Michal Suchanek @ 2016-06-06 11:36 ` Mark Brown 0 siblings, 0 replies; 28+ messages in thread From: Mark Brown @ 2016-06-06 11:36 UTC (permalink / raw) To: Michal Suchanek Cc: Priit Laes, Maxime Ripard, Geert Uytterhoeven, linux-sunxi, Chen-Yu Tsai, linux-spi, linux-arm-kernel, linux-kernel [-- Attachment #1: Type: text/plain, Size: 2289 bytes --] On Sun, Jun 05, 2016 at 01:27:11PM +0200, Michal Suchanek wrote: > On 2 June 2016 at 16:26, Mark Brown <broonie@kernel.org> wrote: > > On Thu, Jun 02, 2016 at 02:14:26PM +0200, Michal Suchanek wrote: > >> And the code added in that patch will never run unless you > >> 1) use long spi transfers > >> 2) compile in/load SPI without DMA support > >> There is no reason for doing 2) since we have do DMA support for sunxi. > > Well, presumably such code exists and is being worked on? > Which code are you referring to? > This is a reply to patch which adds DMA support to the SPI driver so > that it can work for arbitrarily long transfers. It sounded like there might be a missing DMA driver? Though I think I was misreading the above. > > Oh, come on. You might not want to use it yourself but the chances are > > that someone will want to use it just like the situation with all the > > other SPI drivers. It's a perfectly reasonable and sensible feature to > > support upstream. > Is it? > Once we have *one* driver that works for arbitrarily long transfers > and it works out of the box with the board defconfig 99% of people who > will use the SPI driver for anything will use this driver. Any other > variant will go untested. We don't want multiple drivers for this and general maintainability reasons, I'm not sure where the idea that we might want multiple drivers came from? > And for the driver to also work without DMA you have to *tell* it to > probe without DMA because it cannot know you are not going to load a > DMA driver later. Yes. This puts the cost on the special snowflake systems that absolutely cannot have any DMA support in their systems for some reason while keeping the driver featureful by default, and keeps that cost fairly small. > > I really do not understand why there is such a strong desire to have > > these devices be a special snowflake here, the worst that's likely to > > happen here is that you're going to end up having to either remove the > > DMA controller from the DT or load the driver for it neither of which > > seem like the end of the world. > Why would you do that? Like I say I really don't understand why this is. I'm just saying there are ways to do this fairly simply if people really want it on their systems. [-- Attachment #2: signature.asc --] [-- Type: application/pgp-signature, Size: 473 bytes --] ^ permalink raw reply [flat|nested] 28+ messages in thread
end of thread, other threads:[~2016-06-06 11:38 UTC | newest] Thread overview: 28+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <cover.1464130597.git.hramrach@gmail.com> [not found] ` <e315008b5e9dc3f1490507508fd2f6e94767dfbb.1464130597.git.hramrach@gmail.com> 2016-05-30 8:37 ` [PATCH 2/5] spi: sun4i: fix FIFO limit Maxime Ripard [not found] ` <5fffb7eca6f4b70853d92be2403595d6d06bede7.1464130597.git.hramrach@gmail.com> 2016-05-30 8:37 ` [PATCH 3/5] spi: sunxi: expose maximum transfer size limit Maxime Ripard 2016-05-30 8:57 ` Michal Suchanek 2016-06-01 18:14 ` Maxime Ripard [not found] ` <7292b1fa08de4f453a643beb63e9faa7826726f6.1464130597.git.hramrach@gmail.com> 2016-05-30 9:17 ` [PATCH 4/5] spi: sunxi: set maximum and minimum speed of SPI master Maxime Ripard [not found] ` <cb90b922caa6ac07c1425d726ea19709ee5284f4.1464130597.git.hramrach@gmail.com> 2016-05-27 2:05 ` [linux-sunxi] [PATCH 1/5] spi: sunxi: fix transfer timeout Julian Calaby 2016-05-27 5:05 ` Michal Suchanek 2016-05-27 5:10 ` Julian Calaby 2016-05-30 11:23 ` Mark Brown 2016-05-31 11:52 ` Michal Suchanek 2016-06-01 18:20 ` Maxime Ripard 2016-05-30 9:44 ` Maxime Ripard [not found] ` <ba0d6eb37cc4b0d2c46acbf9fcd7d644b3545ce8.1464130597.git.hramrach@gmail.com> 2016-05-30 11:26 ` [PATCH 5/5] RFC spi: sun4i: add DMA support Mark Brown 2016-05-30 12:11 ` Geert Uytterhoeven 2016-05-30 15:03 ` Mark Brown 2016-05-30 15:28 ` Michal Suchanek 2016-05-30 15:50 ` Mark Brown 2016-05-31 10:44 ` Michal Suchanek 2016-05-31 13:27 ` Mark Brown 2016-05-31 14:19 ` Michal Suchanek 2016-06-02 8:18 ` Maxime Ripard 2016-06-01 18:00 ` Maxime Ripard 2016-06-02 4:42 ` [linux-sunxi] " Priit Laes 2016-06-02 9:18 ` Mark Brown 2016-06-02 12:14 ` Michal Suchanek 2016-06-02 14:26 ` Mark Brown 2016-06-05 11:27 ` Michal Suchanek 2016-06-06 11:36 ` Mark Brown
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