| Message ID | 20240304-pinephone-pll-fixes-v3-2-94ab828f269a@oltmanns.dev (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | Pinephone video out fixes (flipping between two frames) | expand |
On Mon, 4 Mar 2024 08:29:18 +0100, Frank Oltmanns wrote: > When the Allwinner A64's TCON0 searches the ideal rate for the connected > panel, it may happen that it requests a rate from its parent PLL-MIPI > which PLL-MIPI does not support. > > This happens for example on the Olimex TERES-I laptop where TCON0 > > [ ... ] Reviewed-by: Maxime Ripard <mripard@kernel.org> Thanks! Maxime
diff --git a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c index 8951ffc14ff5..6a4b2b9ef30a 100644 --- a/drivers/clk/sunxi-ng/ccu-sun50i-a64.c +++ b/drivers/clk/sunxi-ng/ccu-sun50i-a64.c @@ -182,6 +182,8 @@ static struct ccu_nkm pll_mipi_clk = { &ccu_nkm_ops, CLK_SET_RATE_UNGATE | CLK_SET_RATE_PARENT), .features = CCU_FEATURE_CLOSEST_RATE, + .min_rate = 500000000, + .max_rate = 1400000000, }, };
When the Allwinner A64's TCON0 searches the ideal rate for the connected panel, it may happen that it requests a rate from its parent PLL-MIPI which PLL-MIPI does not support. This happens for example on the Olimex TERES-I laptop where TCON0 requests PLL-MIPI to change to a rate of several GHz which causes the panel to stay blank. It also happens on the pinephone where a rate of less than 500 MHz is requested which causes instabilities on some phones. Set the minimum and maximum rate of Allwinner A64's PLL-MIPI according to the Allwinner User Manual. Fixes: ca1170b69968 ("clk: sunxi-ng: a64: force select PLL_MIPI in TCON0 mux") Reported-by: Diego Roversi <diegor@tiscali.it> Closes: https://groups.google.com/g/linux-sunxi/c/Rh-Uqqa66bw Signed-off-by: Frank Oltmanns <frank@oltmanns.dev> Tested-by: Diego Roversi <diegor@tiscali.it> Cc: stable@vger.kernel.org --- drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 2 ++ 1 file changed, 2 insertions(+)