* [PATCH] [SPI][POWERPC] spi_mpc83xx: in "QE mode" spiclk is sysclk/2
@ 2007-08-02 14:26 Anton Vorontsov
[not found] ` <20070802142641.GA6309-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
0 siblings, 1 reply; 6+ messages in thread
From: Anton Vorontsov @ 2007-08-02 14:26 UTC (permalink / raw)
To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f
Cc: linuxppc-dev-mnsaURCQ41sdnm+yROfE0A
For MPC8349E input to SPIBRG is SYSCLK, but it's SYSCLK/2 for
MPC8323E (running in so-called "QE mode").
This fixes clocking issues I've noticed recently.
Probably someday mpc83xx_spi->sysclk should be renamed to
mpc83xx_spi->spiclk to be less confusing.
Signed-off-by: Anton Vorontsov <avorontsov-hkdhdckH98+B+jHODAdFcQ@public.gmane.org>
---
drivers/spi/spi_mpc83xx.c | 6 +++++-
1 files changed, 5 insertions(+), 1 deletions(-)
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
index 0c16a2b..55230f7 100644
--- a/drivers/spi/spi_mpc83xx.c
+++ b/drivers/spi/spi_mpc83xx.c
@@ -429,13 +429,17 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
mpc83xx_spi->bitbang.chipselect = mpc83xx_spi_chipselect;
mpc83xx_spi->bitbang.setup_transfer = mpc83xx_spi_setup_transfer;
mpc83xx_spi->bitbang.txrx_bufs = mpc83xx_spi_bufs;
- mpc83xx_spi->sysclk = pdata->sysclk;
mpc83xx_spi->activate_cs = pdata->activate_cs;
mpc83xx_spi->deactivate_cs = pdata->deactivate_cs;
mpc83xx_spi->qe_mode = pdata->qe_mode;
mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8;
mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8;
+ if (mpc83xx_spi->qe_mode)
+ mpc83xx_spi->sysclk = pdata->sysclk / 2;
+ else
+ mpc83xx_spi->sysclk = pdata->sysclk;
+
mpc83xx_spi->rx_shift = 0;
mpc83xx_spi->tx_shift = 0;
if (mpc83xx_spi->qe_mode) {
--
1.5.0.6
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* Re: [PATCH] [SPI][POWERPC] spi_mpc83xx: in "QE mode" spiclk is sysclk/2
[not found] ` <20070802142641.GA6309-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
@ 2007-08-02 15:19 ` Kumar Gala
[not found] ` <59836CD3-C46E-4B51-8FFE-5F40107CAA85-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
2007-08-02 21:47 ` David Brownell
1 sibling, 1 reply; 6+ messages in thread
From: Kumar Gala @ 2007-08-02 15:19 UTC (permalink / raw)
To: Anton Vorontsov
Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f,
linuxppc-dev-mnsaURCQ41sdnm+yROfE0A
On Aug 2, 2007, at 9:26 AM, Anton Vorontsov wrote:
> For MPC8349E input to SPIBRG is SYSCLK, but it's SYSCLK/2 for
> MPC8323E (running in so-called "QE mode").
QE mode or the SPI in QE running in CPU mode?
- k
>
> This fixes clocking issues I've noticed recently.
>
> Probably someday mpc83xx_spi->sysclk should be renamed to
> mpc83xx_spi->spiclk to be less confusing.
>
> Signed-off-by: Anton Vorontsov <avorontsov-hkdhdckH98+B+jHODAdFcQ@public.gmane.org>
> ---
> drivers/spi/spi_mpc83xx.c | 6 +++++-
> 1 files changed, 5 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
> index 0c16a2b..55230f7 100644
> --- a/drivers/spi/spi_mpc83xx.c
> +++ b/drivers/spi/spi_mpc83xx.c
> @@ -429,13 +429,17 @@ static int __init mpc83xx_spi_probe(struct
> platform_device *dev)
> mpc83xx_spi->bitbang.chipselect = mpc83xx_spi_chipselect;
> mpc83xx_spi->bitbang.setup_transfer = mpc83xx_spi_setup_transfer;
> mpc83xx_spi->bitbang.txrx_bufs = mpc83xx_spi_bufs;
> - mpc83xx_spi->sysclk = pdata->sysclk;
> mpc83xx_spi->activate_cs = pdata->activate_cs;
> mpc83xx_spi->deactivate_cs = pdata->deactivate_cs;
> mpc83xx_spi->qe_mode = pdata->qe_mode;
> mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8;
> mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8;
>
> + if (mpc83xx_spi->qe_mode)
> + mpc83xx_spi->sysclk = pdata->sysclk / 2;
> + else
> + mpc83xx_spi->sysclk = pdata->sysclk;
> +
> mpc83xx_spi->rx_shift = 0;
> mpc83xx_spi->tx_shift = 0;
> if (mpc83xx_spi->qe_mode) {
> --
> 1.5.0.6
> _______________________________________________
> Linuxppc-dev mailing list
> Linuxppc-dev-mnsaURCQ41sdnm+yROfE0A@public.gmane.org
> https://ozlabs.org/mailman/listinfo/linuxppc-dev
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] [SPI][POWERPC] spi_mpc83xx: in "QE mode" spiclk is sysclk/2
[not found] ` <59836CD3-C46E-4B51-8FFE-5F40107CAA85-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
@ 2007-08-02 15:27 ` Anton Vorontsov
0 siblings, 0 replies; 6+ messages in thread
From: Anton Vorontsov @ 2007-08-02 15:27 UTC (permalink / raw)
To: Kumar Gala
Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f,
linuxppc-dev-mnsaURCQ41sdnm+yROfE0A
On Thu, Aug 02, 2007 at 10:19:17AM -0500, Kumar Gala wrote:
>
> On Aug 2, 2007, at 9:26 AM, Anton Vorontsov wrote:
>
>> For MPC8349E input to SPIBRG is SYSCLK, but it's SYSCLK/2 for
>> MPC8323E (running in so-called "QE mode").
>
> QE mode or the SPI in QE running in CPU mode?
Yeah, "qe_mode" variable is confusing, but it wasn't me who introduced
it. ;-) So, "the SPI in QE running in CPU mode" is correct.
[ Unrelated to that particular patch.
Probably qe_mode should be renamed to something better, maybe
spi_in_qe? Or we could back to discussion about auto detecting it
somehow. ]
> - k
Thanks,
--
Anton Vorontsov
email: cbou-JGs/UdohzUI@public.gmane.org
backup email: ya-cbou-o+MxOtu4lMCHXe+LvDLADg@public.gmane.org
irc://irc.freenode.net/bd2
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] [SPI][POWERPC] spi_mpc83xx: in "QE mode" spiclk is sysclk/2
[not found] ` <20070802142641.GA6309-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-08-02 15:19 ` Kumar Gala
@ 2007-08-02 21:47 ` David Brownell
[not found] ` <200708021447.22028.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
1 sibling, 1 reply; 6+ messages in thread
From: David Brownell @ 2007-08-02 21:47 UTC (permalink / raw)
To: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f
Cc: linuxppc-dev-mnsaURCQ41sdnm+yROfE0A
On Thursday 02 August 2007, Anton Vorontsov wrote:
> Probably someday mpc83xx_spi->sysclk should be renamed to
> mpc83xx_spi->spiclk to be less confusing.
Why not "today", with this patch? That would fix some of
the root cause of this bug...
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] [SPI][POWERPC] spi_mpc83xx: in "QE mode" spiclk is sysclk/2
[not found] ` <200708021447.22028.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
@ 2007-08-03 9:29 ` Kumar Gala
[not found] ` <595EE3AF-CDD6-4260-83D9-A3FA3EA1DF95-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
0 siblings, 1 reply; 6+ messages in thread
From: Kumar Gala @ 2007-08-03 9:29 UTC (permalink / raw)
To: David Brownell
Cc: spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f,
linuxppc-dev-mnsaURCQ41sdnm+yROfE0A
On Aug 2, 2007, at 4:47 PM, David Brownell wrote:
> On Thursday 02 August 2007, Anton Vorontsov wrote:
>> Probably someday mpc83xx_spi->sysclk should be renamed to
>> mpc83xx_spi->spiclk to be less confusing.
>
> Why not "today", with this patch? That would fix some of
> the root cause of this bug...
I'm fine with this as well. I just called it sysclk to start with
since when I wrote the driver it was just for the MPC834x.
- k
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^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] [SPI][POWERPC] spi_mpc83xx: in "QE mode" spiclk is sysclk/2
[not found] ` <595EE3AF-CDD6-4260-83D9-A3FA3EA1DF95-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
@ 2007-08-06 12:04 ` Anton Vorontsov
0 siblings, 0 replies; 6+ messages in thread
From: Anton Vorontsov @ 2007-08-06 12:04 UTC (permalink / raw)
To: Kumar Gala
Cc: David Brownell,
spi-devel-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f,
linuxppc-dev-mnsaURCQ41sdnm+yROfE0A
On Fri, Aug 03, 2007 at 04:29:48AM -0500, Kumar Gala wrote:
>
> On Aug 2, 2007, at 4:47 PM, David Brownell wrote:
>
> > On Thursday 02 August 2007, Anton Vorontsov wrote:
> >> Probably someday mpc83xx_spi->sysclk should be renamed to
> >> mpc83xx_spi->spiclk to be less confusing.
> >
> > Why not "today", with this patch? That would fix some of
> > the root cause of this bug...
>
> I'm fine with this as well. I just called it sysclk to start with
> since when I wrote the driver it was just for the MPC834x.
Ok, great.
Now I think that `spiclk' is the bad name either, because it's output
clock of the spi unit. `spibrg' should be the best name for this,
as it's input clock to the SPI unit. Patch below.
- - - -
From: Anton Vorontsov <avorontsov-hkdhdckH98+B+jHODAdFcQ@public.gmane.org>
Subject: [PATCH] spi_mpc83xx: for SPI in QE spibrg's input is sysclk/2
For MPC8349E input to SPIBRG is SYSCLK, but it's SYSCLK/2 for
MPC8323E (SPI in QE).
Also mpc83xx_spi->sysclk renamed to mpc83xx_spi->spibrg.
Signed-off-by: Anton Vorontsov <avorontsov-hkdhdckH98+B+jHODAdFcQ@public.gmane.org>
---
drivers/spi/spi_mpc83xx.c | 20 ++++++++++++--------
1 files changed, 12 insertions(+), 8 deletions(-)
diff --git a/drivers/spi/spi_mpc83xx.c b/drivers/spi/spi_mpc83xx.c
index 0c16a2b..446b624 100644
--- a/drivers/spi/spi_mpc83xx.c
+++ b/drivers/spi/spi_mpc83xx.c
@@ -86,7 +86,7 @@ struct mpc83xx_spi {
unsigned nsecs; /* (clock cycle time)/2 */
- u32 sysclk;
+ u32 spibrg; /* SPIBRG input clock */
u32 rx_shift; /* RX data reg shift when in qe mode */
u32 tx_shift; /* TX data reg shift when in qe mode */
@@ -169,17 +169,17 @@ static void mpc83xx_spi_chipselect(struct spi_device *spi, int value)
regval |= SPMODE_LEN(len);
- if ((mpc83xx_spi->sysclk / spi->max_speed_hz) >= 64) {
- u8 pm = mpc83xx_spi->sysclk / (spi->max_speed_hz * 64);
+ if ((mpc83xx_spi->spibrg / spi->max_speed_hz) >= 64) {
+ u8 pm = mpc83xx_spi->spibrg / (spi->max_speed_hz * 64);
if (pm > 0x0f) {
- printk(KERN_WARNING "MPC83xx SPI: SPICLK can't be less then a SYSCLK/1024!\n"
- "Requested SPICLK is %d Hz. Will use %d Hz instead.\n",
- spi->max_speed_hz, mpc83xx_spi->sysclk / 1024);
+ dev_warn(&spi->dev, "Requested speed is too "
+ "low: %d Hz. Will use %d Hz instead.\n",
+ spi->max_speed_hz, mpc83xx_spi->spibrg / 1024);
pm = 0x0f;
}
regval |= SPMODE_PM(pm) | SPMODE_DIV16;
} else {
- u8 pm = mpc83xx_spi->sysclk / (spi->max_speed_hz * 4);
+ u8 pm = mpc83xx_spi->spibrg / (spi->max_speed_hz * 4);
regval |= SPMODE_PM(pm);
}
@@ -429,13 +429,17 @@ static int __init mpc83xx_spi_probe(struct platform_device *dev)
mpc83xx_spi->bitbang.chipselect = mpc83xx_spi_chipselect;
mpc83xx_spi->bitbang.setup_transfer = mpc83xx_spi_setup_transfer;
mpc83xx_spi->bitbang.txrx_bufs = mpc83xx_spi_bufs;
- mpc83xx_spi->sysclk = pdata->sysclk;
mpc83xx_spi->activate_cs = pdata->activate_cs;
mpc83xx_spi->deactivate_cs = pdata->deactivate_cs;
mpc83xx_spi->qe_mode = pdata->qe_mode;
mpc83xx_spi->get_rx = mpc83xx_spi_rx_buf_u8;
mpc83xx_spi->get_tx = mpc83xx_spi_tx_buf_u8;
+ if (mpc83xx_spi->qe_mode)
+ mpc83xx_spi->spibrg = pdata->sysclk / 2;
+ else
+ mpc83xx_spi->spibrg = pdata->sysclk;
+
mpc83xx_spi->rx_shift = 0;
mpc83xx_spi->tx_shift = 0;
if (mpc83xx_spi->qe_mode) {
--
1.5.0.6
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^ permalink raw reply related [flat|nested] 6+ messages in thread
end of thread, other threads:[~2007-08-06 12:04 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2007-08-02 14:26 [PATCH] [SPI][POWERPC] spi_mpc83xx: in "QE mode" spiclk is sysclk/2 Anton Vorontsov
[not found] ` <20070802142641.GA6309-bi+AKbBUZKY6gyzm1THtWbp2dZbC/Bob@public.gmane.org>
2007-08-02 15:19 ` Kumar Gala
[not found] ` <59836CD3-C46E-4B51-8FFE-5F40107CAA85-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
2007-08-02 15:27 ` Anton Vorontsov
2007-08-02 21:47 ` David Brownell
[not found] ` <200708021447.22028.david-b-yBeKhBN/0LDR7s880joybQ@public.gmane.org>
2007-08-03 9:29 ` Kumar Gala
[not found] ` <595EE3AF-CDD6-4260-83D9-A3FA3EA1DF95-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>
2007-08-06 12:04 ` Anton Vorontsov
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