Re: [PATCH 3/5] drm/msm: mdss: Add QCS8300 support

Yongxing Mou <quic_yongmou@xxxxxxxxxxx> · Thu, 5 Dec 2024 17:04:14 +0800

On 2024/11/29 21:37, Dmitry Baryshkov wrote:
On Fri, 29 Nov 2024 at 11:56, Yongxing Mou <quic_yongmou@xxxxxxxxxxx> wrote:



On 2024/11/27 21:46, Dmitry Baryshkov wrote:
On Wed, Nov 27, 2024 at 03:05:03PM +0800, Yongxing Mou wrote:
Add Mobile Display Subsystem (MDSS) support for the QCS8300 platform.

Please mention, why do you need it at all. I see that the UBWC swizzle
and HBB settings are different. Is this really the case? Is it because
of the different memory being used on those platforms?

Thanks, will modify the comment to add more information .QCS8300 UBWC
setting is quite different with SA8775P,it use different memory,so their
recommended configurations are not quite the same.this is really setting.

We had several cases where the platform should be using different HBB
if it uses different memory type. Is that the case here? If so, rather
than adding another compat entry please extend the msm_mdss to read
memory type and select HBB based on that. This will also fix several
TODO items in the driver.

As a side note, I see that your config has different ubwc_swizzle. If
that's actually different, then maybe you are right and there should
be a separate entry.

yes,ubwc_swizzle is also different with sa8775p for there recommended 
setting are different.

Signed-off-by: Yongxing Mou <quic_yongmou@xxxxxxxxxxx>
---
   drivers/gpu/drm/msm/msm_mdss.c | 11 +++++++++++
   1 file changed, 11 insertions(+)

diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
index b7bd899ead44bf86998e7295bccb31a334fa6811..90d8fe469d3134ec73f386153509ac257d75930a 100644
--- a/drivers/gpu/drm/msm/msm_mdss.c
+++ b/drivers/gpu/drm/msm/msm_mdss.c
@@ -568,6 +568,16 @@ static const struct msm_mdss_data qcm2290_data = {
      .reg_bus_bw = 76800,
   };

+static const struct msm_mdss_data qcs8300_data = {
+    .ubwc_enc_version = UBWC_4_0,
+    .ubwc_dec_version = UBWC_4_0,
+    .ubwc_swizzle = 6,
+    .ubwc_static = 1,
+    .highest_bank_bit = 3,
+    .macrotile_mode = 1,
+    .reg_bus_bw = 74000,
+};
+
   static const struct msm_mdss_data sa8775p_data = {
      .ubwc_enc_version = UBWC_4_0,
      .ubwc_dec_version = UBWC_4_0,
@@ -715,6 +725,7 @@ static const struct of_device_id mdss_dt_match[] = {
      { .compatible = "qcom,mdss" },
      { .compatible = "qcom,msm8998-mdss", .data = &msm8998_data },
      { .compatible = "qcom,qcm2290-mdss", .data = &qcm2290_data },
+    { .compatible = "qcom,qcs8300-mdss", .data = &qcs8300_data },
      { .compatible = "qcom,sa8775p-mdss", .data = &sa8775p_data },
      { .compatible = "qcom,sdm670-mdss", .data = &sdm670_data },
      { .compatible = "qcom,sdm845-mdss", .data = &sdm845_data },

--
2.34.1












