Hi Konrad,
On 18.04.23 15:10, Konrad Dybcio wrote:
Apart from the already handled data bus (MAS_MDP_Pn<->DDR), there's
another path that needs to be handled to ensure MDSS functions properly,
namely the "reg bus", a.k.a the CPU-MDSS interconnect.
Gating that path may have a variety of effects.. from none to otherwise
inexplicable DSI timeouts..
On the MDSS side, we only have to ensure that it's on at what Qualcomm
downstream calls "77 MHz", a.k.a 76.8 Mbps and turn it off at suspend.
To achieve that, make msm_mdss_icc_request_bw() accept a boolean to
indicate whether we want the busses to be on or off, as this function's
only use is to vote for minimum or no bandwidth at all.
Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
---
drivers/gpu/drm/msm/msm_mdss.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
[..]
-static void msm_mdss_icc_request_bw(struct msm_mdss *msm_mdss, unsigned long bw)
+static void msm_mdss_icc_request_bw(struct msm_mdss *msm_mdss, bool enable)
{
int i;
for (i = 0; i < msm_mdss->num_mdp_paths; i++)
- icc_set_bw(msm_mdss->mdp_path[i], 0, Bps_to_icc(bw));
+ icc_set_bw(msm_mdss->mdp_path[i], 0, enable ? Bps_to_icc(MIN_IB_BW) : 0);
+
+ if (msm_mdss->reg_bus_path)
+ icc_set_bw(msm_mdss->reg_bus_path, 0, enable ? 76800 : 0);
Please use Bps_to_icc, kbps_to_icc or any of the other macros.
BR,
Georgi
