[PATCH V6 2/5] ahci_plt Add the board_ids and pi refer to different features

[Eric Miao]

On Mon, Aug 29, 2011 at 5:37 PM, Wolfram Sang <w.sang at pengutronix.de> wrote:
> On Mon, Aug 29, 2011 at 04:51:46PM +0800, Eric Miao wrote:
>> On Mon, Aug 29, 2011 at 4:36 PM, Wolfram Sang <w.sang at pengutronix.de> wrote:
>> > On Mon, Aug 29, 2011 at 03:18:55PM +0800, Richard Zhu wrote:
>> >> On imx53 AHCI, soft reset fails with IPMS set when PMP
>> >> is enabled but SATA HDD/ODD is connected to SATA port,
>> >> do soft reset again to port 0.
>> >> So the 'ahci_pmp_retry_srst_ops' is required when imx53
>> >> ahci is present.
>> >>
>> >> Signed-off-by: Richard Zhu <richard.zhu at linaro.org>
>> >> ---
>> >>  drivers/ata/ahci_platform.c |   44 +++++++++++++++++++++++++++++++++++++-----
>> >>  1 files changed, 38 insertions(+), 6 deletions(-)
>> >>
>> >> diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
>> >> index 6fef1fa..f32c91e 100644
>> >> --- a/drivers/ata/ahci_platform.c
>> >> +++ b/drivers/ata/ahci_platform.c
>> >> @@ -23,6 +23,41 @@
>> >>  #include <linux/ahci_platform.h>
>> >>  #include "ahci.h"
>> >>
>> >> +enum ahci_type {
>> >> +     AHCI,           /* standard platform ahci */
>> >> +     IMX53_AHCI,     /* ahci on i.mx53 */
>> >
>> > How about making all the IMX*-naming more generic because other SoC might need
>> > this somewhen, too?
>>
>> From a practical point of view, we can start with what we know already.
>> As the SATA controller on "other SoC" so far, we don't know yet if they
>> show the same issue (which we have to use ahci_pmp_retry_srst_ops).
>>
>> So Wolfram, how about we consider a generic one once more controllers
>> are being added?
>
> If we do so later, and we then also change the platform_device_id to something
> generic, we then also have to change all users, too. Is it so bad to change
> IMX53_AHCI (and imx53-ahci and alike) to something like "ahci-pmp-retry-srst"
> (or similar) now?

There are other fields in ata_port_info which might be different between
boards. Using a SoC specific name as an index to an array of ata_port_info
will be more flexible, as is adopted in drivers/ata/ahci.c - the PCI driver.