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(dsi0_phy_pll_out_dsiclk's parent is dsi0_pll_bit_clk now (dsiclk_sel = 0)) And we failed to set dsiclk's children. dsi_link_clk_set_rate_6g: Set clk rates: pclk=172992000, byteclk=108120000 byteclk was set first to 108120000, so the vco rate was set to 108120000 * 7 * 1 * 1 = 756840000. When we was trying to set 172992000 on mdss_pixel_clk_src later. Since there was no matched ratio, we failed to set it. And dsiclk divider ratio was set to 15:1 (wrong cached register value 0xf and didn't update), we finally got 50455997, apparently wrong. dsi0vco_clk 1 1 0 756839941 dsi0_pll_out_div_clk 1 1 0 756839941 dsi0_pll_post_out_div_clk 0 0 0 216239983 dsi0_pll_bit_clk 2 2 0 756839941 dsi0_phy_pll_out_dsiclk 2 2 0 50455997 disp_cc_mdss_pclk1_clk_src 1 1 0 50455997 dsi0_pll_by_2_bit_clk 0 0 0 378419970 dsi0_phy_pll_out_byteclk 2 2 0 108119991 disp_cc_mdss_byte1_clk_src 2 2 0 108119991 Downstream clk_summary shows the mdss_pixel_clk_src support the ratio(35:16) dsi0_phy_pll_out_dsiclk 2 2 0 378420000 disp_cc_mdss_pclk1_clk_src 1 1 0 172992000 dsi0_phy_pll_out_byteclk 2 2 0 108120000 disp_cc_mdss_byte1_clk_src 2 2 0 108120000 After checking downstream source, 15:4 also seems to be supported, add them two. Signed-off-by: Pengyu Luo --- drivers/clk/qcom/clk-rcg2.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c index fc696b66cc..6064a0e17d 100644 --- a/drivers/clk/qcom/clk-rcg2.c +++ b/drivers/clk/qcom/clk-rcg2.c @@ -1117,6 +1117,8 @@ static const struct frac_entry frac_table_pixel[] = { { 4, 9 }, { 1, 1 }, { 2, 3 }, + { 16, 35}, + { 4, 15}, { } }; -- 2.53.0