Re: [PATCH v3 10/15] drm/msm/a6xx: Fix A680 highest bank bit value

[Dmitry Baryshkov]

On Thu, 23 Feb 2023 at 15:49, Konrad Dybcio <konrad.dybcio@xxxxxxxxxx> wrote:
>
>
>
> On 23.02.2023 14:06, Dmitry Baryshkov wrote:
> > On Thu, 23 Feb 2023 at 14:07, Konrad Dybcio <konrad.dybcio@xxxxxxxxxx> wrote:
> >>
> >> According to the vendor sources, it's equal to 16, which makes hbb_lo
> >> equal to 3.
> >
> > I think we might be stricken with the ddr kind difference here, but I
> > would not bet on it.
> It totally is, but it also seems to be SoC-dependent..
> I think all 8180x devices shipped with LPDDR4X FWIW

I think so too. However sdmshrike dts uses LPDDR5.

>
> Konrad
> >
> >>
> >> Fixes: 840d10b64dad ("drm: msm: Add 680 gpu to the adreno gpu list")
> >> Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
> >> ---
> >>  drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 8 +++++++-
> >>  1 file changed, 7 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> >> index b5017c56fa1b..2c4afecdd213 100644
> >> --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> >> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
> >> @@ -885,12 +885,18 @@ static void a6xx_set_ubwc_config(struct msm_gpu *gpu)
> >>                 hbb_lo = 2;
> >>         }
> >>
> >> -       if (adreno_is_a640_family(adreno_gpu)) {
> >> +       if (adreno_is_a640(adreno_gpu)) {
> >>                 amsbc = 1;
> >>                 /* HBB = 15 */
> >>                 hbb_lo = 2;
> >>         }
> >>
> >> +       if (adreno_is_a680(adreno_gpu)) {
> >> +               amsbc = 1;
> >> +               /* HBB = 16 */
> >> +               hbb_lo = 3;
> >> +       }
> >> +
> >>         if (adreno_is_a650(adreno_gpu) || adreno_is_a660(adreno_gpu)) {
> >>                 amsbc = 1;
> >>                 /* TODO: get ddr type from bootloader and use 2 for LPDDR4 */
> >>
> >> --
> >> 2.39.2
> >>
> >
> >



-- 
With best wishes
Dmitry