Messages in this thread Patch in this message | | | From | Adam Ford <> | Subject | [PATCH V2 4/4] clk: imx: Let IMX8MN_CLK_DISP_PIXEL set parent rate | Date | Mon, 20 Mar 2023 21:31:36 -0500 |
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By default the display pixel clock needs to be evenly divide down from the video_pll_out clock which rules out a significant number of resolution and refresh rates.
The current clock tree looks something like:
video_pll 594000000 video_pll_bypass 594000000 video_pll_out 594000000 disp_pixel 148500000 disp_pixel_clk 148500000
Now that composite-8m supports determine_rate, we can allow disp_pixel to set the parent rate which then switches every clock in the chain to a new frequency when disp_pixel cannot evenly divide from video_pll_out.
Signed-off-by: Adam Ford <aford173@gmail.com> --- V2: Move imx8m_clk_hw_composite_flags macro into its own patch
diff --git a/drivers/clk/imx/clk-imx8mn.c b/drivers/clk/imx/clk-imx8mn.c index a042ed3a9d6c..4b23a4648600 100644 --- a/drivers/clk/imx/clk-imx8mn.c +++ b/drivers/clk/imx/clk-imx8mn.c @@ -470,7 +470,7 @@ static int imx8mn_clocks_probe(struct platform_device *pdev) hws[IMX8MN_CLK_DRAM_ALT] = imx8m_clk_hw_fw_managed_composite("dram_alt", imx8mn_dram_alt_sels, base + 0xa000); hws[IMX8MN_CLK_DRAM_APB] = imx8m_clk_hw_fw_managed_composite_critical("dram_apb", imx8mn_dram_apb_sels, base + 0xa080); - hws[IMX8MN_CLK_DISP_PIXEL] = imx8m_clk_hw_composite("disp_pixel", imx8mn_disp_pixel_sels, base + 0xa500); + hws[IMX8MN_CLK_DISP_PIXEL] = imx8m_clk_hw_composite_flags("disp_pixel", imx8mn_disp_pixel_sels, base + 0xa500, CLK_SET_RATE_PARENT); hws[IMX8MN_CLK_SAI2] = imx8m_clk_hw_composite("sai2", imx8mn_sai2_sels, base + 0xa600); hws[IMX8MN_CLK_SAI3] = imx8m_clk_hw_composite("sai3", imx8mn_sai3_sels, base + 0xa680); hws[IMX8MN_CLK_SAI5] = imx8m_clk_hw_composite("sai5", imx8mn_sai5_sels, base + 0xa780); -- 2.34.1
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