Hi Dmitry
On 2/25/2023 3:06 PM, Dmitry Baryshkov wrote:
On 24/02/2023 22:51, Abhinav Kumar wrote:
On 2/13/2023 9:36 AM, neil.armstrong@xxxxxxxxxx wrote:
On 13/02/2023 12:16, Dmitry Baryshkov wrote:
On 13/02/2023 12:41, Neil Armstrong wrote:
On 12/02/2023 00:12, Dmitry Baryshkov wrote:
QSEED4 is a newer variant of QSEED3LITE, which should be used on
sm8550. Fix the DPU caps structure and used feature masks.
I found nowhere SM8550 uses Qseed4, on downstream DT, it's written:
qcom,sde-qseed-sw-lib-rev = "qseedv3lite";
qcom,sde-qseed-scalar-version = <0x3002>;
And then the techpack tells us starting from 0x3000 the v3lite is v4:
https://git.codelinaro.org/clo/la/platform/vendor/opensource/display-drivers/-/blob/display-kernel.lnx.5.10.r8-rel/msm/sde/sde_hw_util.c#L59
https://git.codelinaro.org/clo/la/platform/vendor/opensource/display-drivers/-/blob/display-kernel.lnx.5.10.r8-rel/msm/sde/sde_hw_util.c#L102
OK then:
Reviewed-by: Neil Armstrong <neil.armstrong@xxxxxxxxxx>
This little bit of confusion is because with downstream, the qseed is
a separate usermode library having its own revision. So the SW lib
version in this case is not exactly correlating with the scalar HW
revision.
Can you possibly spend some more words here? I see that sde_hw_utils.c
programs scalers slightly different depending on the version of the
scaler. At some point the SDE driver was reading the register to
determine the revision. Then it switched to the revision specified in
the DTS (which, as far as I understand, corresponds to the HW register
contents).
So, where does SW revision come into the play? (and which library are we
talking about?). Is the 'v3lite' an SW revision? Or is the 0x3002 an SW
revision?
qcom,sde-qseed-sw-lib-rev is the SW library revision for libscale.
This is a proprietary library used to calculate the LUTs for the qseed
block. Its not used in the upstream version of the driver.
For upstream driver, the driver uses default settings for the LUTs which
work for most of the common use-cases we see.
You can refer the below property names, there are programmed by the lib
for the downstream driver.
3733 msm_property_install_range(
3734 &psde->property_info, "scaler_v2",
3735 0x0, 0, ~0, 0, PLANE_PROP_SCALER_V2);
3736 msm_property_install_blob(&psde->property_info,
3737 "lut_sep", 0,
3738 PLANE_PROP_SCALER_LUT_SEP);
No, 0x3002 is the HW revision of the qseed and thats why this change is
correct because the SW library name/rev doesnt exactly match the qseed
HW revision as its possible that even qseed3lite library can support the
QSEED4 HW.
So we should be going off qcom,sde-qseed-scalar-version and not
qcom,sde-qseed-sw-lib-rev.
Since upstream DPU only cares about the HW revision of the scaler, we
should be going off the qcom,sde-qseed-scalar-version.
This change LGTM,
Reviewed-by: Abhinav Kumar <quic_abhinavk@xxxxxxxxxxx>
