From: Jeffrey Hugo Date: Thu, 31 Oct 2019 18:57:15 +0000 (-0700) Subject: clk: qcom: Allow constant ratio freq tables for rcg X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=efd164b5520afd6fb2883b68e0d408a7de29c491;p=linux.git clk: qcom: Allow constant ratio freq tables for rcg Some RCGs (the gfx_3d_src_clk in msm8998 for example) are basically just some constant ratio from the input across the entire frequency range. It would be great if we could specify the frequency table as a single entry constant ratio instead of a long list, ie: { .src = P_GPUPLL0_OUT_EVEN, .pre_div = 3 }, { } So, lets support that. We need to fix a corner case in qcom_find_freq() where if the freq table is non-null, but has no frequencies, we end up returning an "entry" before the table array, which is bad. Then, we need ignore the freq from the table, and instead base everything on the requested freq. Suggested-by: Stephen Boyd Signed-off-by: Jeffrey Hugo Link: https://lkml.kernel.org/r/20191031185715.15504-1-jeffrey.l.hugo@gmail.com Signed-off-by: Stephen Boyd --- diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c index 99c4bfa5365f2..8f4b9bec29565 100644 --- a/drivers/clk/qcom/clk-rcg2.c +++ b/drivers/clk/qcom/clk-rcg2.c @@ -220,6 +220,8 @@ static int _freq_tbl_determine_rate(struct clk_hw *hw, const struct freq_tbl *f, if (clk_flags & CLK_SET_RATE_PARENT) { rate = f->freq; if (f->pre_div) { + if (!rate) + rate = req->rate; rate /= 2; rate *= f->pre_div + 1; } diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c index caba81d18c700..60d2a78d13950 100644 --- a/drivers/clk/qcom/common.c +++ b/drivers/clk/qcom/common.c @@ -29,6 +29,9 @@ struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate) if (!f) return NULL; + if (!f->freq) + return f; + for (; f->freq; f++) if (rate <= f->freq) return f;