Messages in this thread | | | From | Adam Ford <> | Subject | [PATCH V2 0/4] clk: imx: Improve imx8mm/imx8mn LCDIF clocks | Date | Mon, 20 Mar 2023 21:31:32 -0500 |
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Both the i.MX8M Mini and Nano have a video_pll which can be used to source a clock which feeds the lcdif interface. This interface currently fixes video_pll and divides down the clock feeding LCDIF. However, when connected to an HDMI bridge chip that supports a variety of video resolutions and refresh rates, the only settings that properly sync are ones that evenly divide from the video_pll_out clock.
This series adds the ability for the clk-compolsite-8m to request a better parent clock rate if the proper clock flag is enable and sets that flag in the corresponding imx8mm and imx8mn video_pll clocks to increase the number of resolutions and refresh rates timings that the LCDIF can produce.
This also has a side benefit of allowing the video-pll to run at a lower clock speed which can potentially save some power depending on the requested resolution and refresh rate.
V2: Split off the new imx8m_clk_hw_composite_flags definition into its own patch and re-order to fix build error.
Adam Ford (3): clk: imx: composite-8m: Add support to determine_rate clk: imx8mm: Let IMX8MM_CLK_LCDIF_PIXEL set parent rate clk: imx: Let IMX8MN_CLK_DISP_PIXEL set parent rate
drivers/clk/imx/clk-composite-8m.c | 7 +++++++ drivers/clk/imx/clk-imx8mm.c | 2 +- drivers/clk/imx/clk-imx8mn.c | 2 +- drivers/clk/imx/clk.h | 4 ++++ 4 files changed, 13 insertions(+), 2 deletions(-)
-- 2.34.1
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