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Re: [PATCH] video: imxfb: correct the bitmask for DMACR_HM/_TM

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Hello Uwe, all,

Thus wrote Uwe Kleine-König (u.kleine-koenig@pengutronix.de):

> For the MX1 which is also supported by this driver, the definitions are
> right.

ok, understood. I wasn't able to dig up an imx1 specification. Do you
know if it's publicly available?

> So this needs a more sophisticated patch. Also I wonder why the
> register definition is in include/linux/platform_data and not in the
> driver directly.

The DMACR_HM() and _TM() macros are meant to be used when we initialize
imx_fb_platform_data's dmacr component for a platform device. It's not
straightforward to distinguish between imx1 and imx21 at initialization
time.

We could modify imx_fb_platform_data to use different components for
dmacr_burst, dmacr_hm, dmacr_tm and calculate the dmacr register value
in the driver where is_imx1_fb() is available. Device tree is also using
a single dmacr entry, it's probably not a good idea to do this
differently for platform devices...

We could also define DMACR_HM_IMX1(), DMACR_HM_IMX21(), ...

Or we could just remove the macros, they are not used by any boards in
the mainline kernel. If we don't want to break proprietary board
definitions, we could at least add a comment that the macros are
incorrect for imx21.

Thoughts?

Best regards,
Martin

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Thread

[PATCH] video: imxfb: correct the bitmask for DMACR_HM/_TM Martin Kaiser <martin@kaiser.cx> - 2016-11-22 09:00 +0100
  Re: [PATCH] video: imxfb: correct the bitmask for DMACR_HM/_TM Uwe Kleine-König          <u.kleine-koenig@pengutronix.de> - 2016-11-22 09:50 +0100
    Re: [PATCH] video: imxfb: correct the bitmask for DMACR_HM/_TM Martin Kaiser <martin@kaiser.cx> - 2016-11-23 10:40 +0100
      Re: [PATCH] video: imxfb: correct the bitmask for DMACR_HM/_TM Uwe Kleine-König          <u.kleine-koenig@pengutronix.de> - 2016-11-23 11:00 +0100
        Re: [PATCH] video: imxfb: correct the bitmask for DMACR_HM/_TM Martin Kaiser <martin@kaiser.cx> - 2016-11-25 09:50 +0100

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