6.8-stable review patch. If anyone has any objections, please let me know.
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From: Frank Oltmanns frank@oltmanns.dev
commit 69f16d9b789821183d342719d2ebd4a5ac7178bc upstream.
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 Tested-by: Diego Roversi diegor@tiscali.it Cc: stable@vger.kernel.org Reviewed-by: Maxime Ripard mripard@kernel.org Signed-off-by: Frank Oltmanns frank@oltmanns.dev Reviewed-by: Jernej Skrabec jernej.skrabec@gmail.com Link: https://lore.kernel.org/r/20240310-pinephone-pll-fixes-v4-2-46fc80c83637@olt... Signed-off-by: Jernej Skrabec jernej.skrabec@gmail.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/clk/sunxi-ng/ccu-sun50i-a64.c | 2 ++ 1 file changed, 2 insertions(+)
--- 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, }, };