On Friday, June 27, 2014 10:03 PM, Ajay kumar wrote:
> On Fri, Jun 27, 2014 at 6:14 PM, Andrzej Hajda <a.hajda@xxxxxxxxxxx> wrote:
> > On 06/27/2014 01:48 PM, Ajay kumar wrote:
> >> On Fri, Jun 27, 2014 at 4:52 PM, Andrzej Hajda <a.hajda@xxxxxxxxxxx> wrote:
> >>> +CC DT
> >>>
> >>> On 06/27/2014 12:12 PM, Ajay Kumar wrote:
> >>>> Add the missing setting for DP CLKCON register.
> >>>>
> >>>> This register is present on Exynos5 based FIMD controllers,
> >>>> and needs to be set if we are using DP.
> >>>>
> >>>> Signed-off-by: Ajay Kumar <ajaykumar.rs@xxxxxxxxxxx>
> >>>> ---
> >>>> .../devicetree/bindings/video/samsung-fimd.txt | 1 +
> >>>> drivers/gpu/drm/exynos/exynos_drm_fimd.c | 23 ++++++++++++++++++++
> >>>> include/video/samsung_fimd.h | 4 ++++
> >>>> 3 files changed, 28 insertions(+)
[.....]
> >>>> static const struct of_device_id fimd_driver_dt_match[] = {
> >>>> @@ -331,6 +341,10 @@ static void fimd_commit(struct exynos_drm_manager *mgr)
> >>>> if (clkdiv > 1)
> >>>> val |= VIDCON0_CLKVAL_F(clkdiv - 1) | VIDCON0_CLKDIR;
> >>>>
> >>>> + if (ctx->driver_data->has_dp_clkcon &&
> >>>> + ctx->exynos_fimd_output_type == EXYNOS_FIMD_OUTPUT_DP)
> >>>> + writel(DP_CLK_ENABLE, ctx->regs + DP_CLKCON);
> >>>> +
> >>>> writel(val, ctx->regs + VIDCON0);
> >
> > New code should not split VIDCON0 related code.It should be moved few
> > lines above or few lines below.
> Ok, for better readability.
>
> > Anyway this code should be rather placed in power related functions of
> > dp encoder, as it enables dp. The only question
> > is if DP_CLKCON update can be performed after VIDCON0 update. If yes the
> > solution of the whole problem
> I will check this.
>
> > seems to be simple:
> > - fimd should provide function fimd_set_dp_clk_gate or sth similar,
> > - this function should be called in exynos_dp_poweron/exynos_dp_poweroff.
> > I hope I have not missed anything this time.
> But, it won't look good to export a FIMD function which sets a FIMD register,
> and call it in DP driver!
> What does Inki/Jingoo have to say about this?
I agree with Ajay Kumar's opinion.
It doesn't look good to export the function to set FIMD register
and call it by DP driver.
Best regards,
Jingoo Han
>
> Regards,
> Ajay
>
[....]
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