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Subject[PATCH v2 3/5] clk: tegra: emc: Fix EMC max-rate clamping
Date
When a clk user requests rate that is higher than the maximum possible,
the rate shall be clamped to the maximum and not to the current value.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
drivers/clk/tegra/clk-emc.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/clk/tegra/clk-emc.c b/drivers/clk/tegra/clk-emc.c
index 28068584ff6e..9a0179235939 100644
--- a/drivers/clk/tegra/clk-emc.c
+++ b/drivers/clk/tegra/clk-emc.c
@@ -121,7 +121,7 @@ static int emc_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
struct tegra_clk_emc *tegra;
u8 ram_code = tegra_read_ram_code();
struct emc_timing *timing = NULL;
- int i, k;
+ int i, k, t;

tegra = container_of(hw, struct tegra_clk_emc, hw);

@@ -130,12 +130,17 @@ static int emc_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
break;
}

- for (i = k; i < tegra->num_timings; i++) {
- if (tegra->timings[i].ram_code != ram_code)
+ for (t = k; t < tegra->num_timings; t++) {
+ if (tegra->timings[t].ram_code != ram_code)
break;
+ }

+ for (i = k; i < t; i++) {
timing = tegra->timings + i;

+ if (timing->rate < req->rate && i != t - 1)
+ continue;
+
if (timing->rate > req->max_rate) {
i = max(i, k + 1);
req->rate = tegra->timings[i - 1].rate;
@@ -145,10 +150,8 @@ static int emc_determine_rate(struct clk_hw *hw, struct clk_rate_request *req)
if (timing->rate < req->min_rate)
continue;

- if (timing->rate >= req->rate) {
- req->rate = timing->rate;
- return 0;
- }
+ req->rate = timing->rate;
+ return 0;
}

if (timing) {
--
2.21.0
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