On some pinephones the video output sometimes freezes (flips between two frames) [1]. It seems to be that the reason for this behaviour is that PLL-MIPI and PLL-VIDEO0 are operating outside there specified limits.
The changes I propose in this patch series consists of two major parts: 1. sunxi-ng: Adhere to the following constraints given in the Allwinner A64 Manual: a. PLL-MIPI: * M/N >= 3 * (PLL_VIDEO0)/M >= 24MHz b. PLL-VIDEO0: * 8 <= N/M <= 25 2. Choose a higher clock rate for the ST7703 based XDB599 panel, so that the panel functions with the Allwinner A64 SOC. PLL-MIPI must run between 500 MHz and 1.4 GHz. As PLL-MIPI runs at 6 times the panel's clock rate, we need its clock to be at least 83.333 MHz. So far, I've tested the patches only on my pinephone. Before the patches it would freeze at least every other day. With the patches it has not shown this behavior in over a week. I very much appreciate your feedback! [1] https://gitlab.com/postmarketOS/pmaports/-/issues/805 Signed-off-by: Frank Oltmanns <fr...@oltmanns.dev> --- Frank Oltmanns (5): clk: sunxi-ng: nkm: Support constraints on m/n ratio and parent rate clk: sunxi-ng: a64: Add constraints on PLL-MIPI's n/m ratio and parent rate clk: sunxi-ng: nm: Support constraints on n/m ratio and parent rate clk: sunxi-ng: a64: Add constraints on PLL-VIDEO0's n/m ratio drm/panel: st7703: Drive XBD599 panel at higher clock rate drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 10 ++++++-- drivers/clk/sunxi-ng/ccu_nkm.c | 23 ++++++++++++++++++ drivers/clk/sunxi-ng/ccu_nkm.h | 8 +++++++ drivers/clk/sunxi-ng/ccu_nm.c | 21 +++++++++++++++-- drivers/clk/sunxi-ng/ccu_nm.h | 34 +++++++++++++++++++++++++-- drivers/gpu/drm/panel/panel-sitronix-st7703.c | 14 +++++------ 6 files changed, 97 insertions(+), 13 deletions(-) --- base-commit: d0ac5722dae5f4302bb4ef6df10d0afa718df80b change-id: 20231218-pinephone-pll-fixes-0ccdfde273e4 Best regards, -- Frank Oltmanns <fr...@oltmanns.dev>