From: Stephen Boyd sboyd@kernel.org
[ Upstream commit 21e157c62eeded8b1558a991b4820b761d48a730 ]
The DFS frequency table logic overwrites 'cfg' while detecting the parent clk and then later on in clk_rcg2_dfs_populate_freq() we use that same variable to figure out the mode of the clk, either MND or not. Add a new variable to hold the parent clk bit so that 'cfg' is left untouched for use later.
This fixes problems in detecting the supported frequencies for any clks in DFS mode.
Fixes: cc4f6944d0e3 ("clk: qcom: Add support for RCG to register for DFS") Reported-by: Rajendra Nayak rnayak@codeaurora.org Signed-off-by: Stephen Boyd sboyd@kernel.org Link: https://lkml.kernel.org/r/20200128193329.45635-1-sboyd@kernel.org Tested-by: Rajendra Nayak rnayak@codeaurora.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/clk/qcom/clk-rcg2.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c index 8f4b9bec29565..5e0f7d8f168dd 100644 --- a/drivers/clk/qcom/clk-rcg2.c +++ b/drivers/clk/qcom/clk-rcg2.c @@ -952,7 +952,7 @@ static void clk_rcg2_dfs_populate_freq(struct clk_hw *hw, unsigned int l, struct clk_rcg2 *rcg = to_clk_rcg2(hw); struct clk_hw *p; unsigned long prate = 0; - u32 val, mask, cfg, mode; + u32 val, mask, cfg, mode, src; int i, num_parents;
regmap_read(rcg->clkr.regmap, rcg->cmd_rcgr + SE_PERF_DFSR(l), &cfg); @@ -962,12 +962,12 @@ static void clk_rcg2_dfs_populate_freq(struct clk_hw *hw, unsigned int l, if (cfg & mask) f->pre_div = cfg & mask;
- cfg &= CFG_SRC_SEL_MASK; - cfg >>= CFG_SRC_SEL_SHIFT; + src = cfg & CFG_SRC_SEL_MASK; + src >>= CFG_SRC_SEL_SHIFT;
num_parents = clk_hw_get_num_parents(hw); for (i = 0; i < num_parents; i++) { - if (cfg == rcg->parent_map[i].cfg) { + if (src == rcg->parent_map[i].cfg) { f->src = rcg->parent_map[i].src; p = clk_hw_get_parent_by_index(&rcg->clkr.hw, i); prate = clk_hw_get_rate(p);