Il giorno lun 28 set 2020 alle ore 18:16 Jordan Crouse <jcrouse@xxxxxxxxxxxxxx> ha scritto: > > On Sat, Sep 26, 2020 at 02:51:44PM +0200, kholk11@xxxxxxxxx wrote: > > From: Konrad Dybcio <konradybcio@xxxxxxxxx> > > > > The upstream API for some reason uses logbase2 instead of > > just passing the argument as-is, whereas downstream CAF > > kernel does the latter. > > > > Hence, a mistake has been made when porting: > > 4 is the value that's supposed to be passed, but > > log2(4) = 2. Changing the value to 16 (= 2^4) fixes > > the issue. > > FWIW I think downstream is wrong. Its a lot more intuitive to pass the number of > registers that should be protected than to force a human to do math. > > Jordan > Uhm, actually, it's upstream the one forcing to do math... :P In any case, downstream you have some calls with an explicit log2 and some others with the "real" number of registers. Hardware magic register layouts, maybe.... :))) -- Angelo > > Signed-off-by: Konrad Dybcio <konradybcio@xxxxxxxxx> > > Signed-off-by: AngeloGioacchino Del Regno <kholk11@xxxxxxxxx> > > --- > > drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 2 +- > > 1 file changed, 1 insertion(+), 1 deletion(-) > > > > diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c > > index 00df5de3c8e3..b2670af638a3 100644 > > --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c > > +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c > > @@ -789,7 +789,7 @@ static int a5xx_hw_init(struct msm_gpu *gpu) > > > > /* VPC */ > > gpu_write(gpu, REG_A5XX_CP_PROTECT(14), ADRENO_PROTECT_RW(0xE68, 8)); > > - gpu_write(gpu, REG_A5XX_CP_PROTECT(15), ADRENO_PROTECT_RW(0xE70, 4)); > > + gpu_write(gpu, REG_A5XX_CP_PROTECT(15), ADRENO_PROTECT_RW(0xE70, 16)); > > > > /* UCHE */ > > gpu_write(gpu, REG_A5XX_CP_PROTECT(16), ADRENO_PROTECT_RW(0xE80, 16)); > > -- > > 2.28.0 > > > > -- > The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, > a Linux Foundation Collaborative Project
