Hi Jeff!
On 04/20/2011 07:44 AM, Igor Plyatov wrote:
* Fix "initial_timing" structure initialisation. The "struct
ata_timing" must
contain 10 members, but ".dmack_hold" member was not initialised.
* The AT91SAM9 microcontrollers use special coding scheme for SMC_SETUP,
SMC_PULSE, SMC_CYCLE registers.
Old driver operates correctly only with low master clock values, but
with high master clock it incorrectly calculates SMC values and stops
to operate, because SMC can be setup only to admissible ranges in
special
format.
New code correctly calculates SMC registers values, adjusts
calculated
to admissible ranges, enlarges cycles if required and converts values
into SMC's format.
* Old driver calculates CS_SETUP and CS_PULSE cycles incorrectly
because of wrong assumptions.
New code calculates:
CS_SETUP = SETUP/2
CS_PULSE = PULSE + SETUP/2 + HOLD/2
* This fixes allows to correctly operate with any master clock
frequency.
Signed-off-by: Igor Plyatov<plyatov@xxxxxxxxx>
---
drivers/ata/pata_at91.c | 223
++++++++++++++++++++++++++++++++---------------
1 files changed, 154 insertions(+), 69 deletions(-)
FYI, the two previous "v4" patches are now applied.
Based on the comments from Stanislaw, this patch would need to be
updated anyway.
Thank you for info!
I will update this patch.
Best regards!
--
Igor Plyatov
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