On Tue, Aug 14, 2018 at 9:00 AM Pradeep Reddy <[email protected]> wrote: > > Hi Archit, > > I have enabled splash screen (penguin) in bootloader with fastboot oem > select-display-panel hdmi. Kernel crashes during boot. I identified that > there is issue with below two smmu clocks. > static struct clk_branch smmu_mdp_ahb_clk = { > .halt_reg = 0x2454, > .clkr = { > .enable_reg = 0x2454, > .enable_mask = BIT(0), > > static struct clk_branch smmu_mdp_axi_clk = { > .halt_reg = 0x2458, > .clkr = { > .enable_reg = 0x2458, > .enable_mask = BIT(0), > > I tried to reset the clocks in mmcc_msm8996_probe, with the below changes. > regmap_update_bits(regmap, 0x2454, BIT(0), 0); > regmap_update_bits(regmap, 0x2458, BIT(0), 0); > > Then i don't see a kernel crash but blue screen appears after penguin for > some time. Then HDMI display comes up. > > Can you please let me know better way to reset smmu clocks? >
tbh, this is probably the tip of the iceberg.. It is going to take a fair bit of work to make this work properly, especially with something like hdmi were we need to readback hw state to figure out display timings. I started something a year or so back on db410c, but it needs some clk framework changes and some gdsc changes. I'm not sure anyone has had a chance to pick up this work since then. Do you *really* need to enable the display from the bootloader. By *far* the easiest solution is to not do that. BR, -R _______________________________________________ Freedreno mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/freedreno
