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clk: qcom: osm: Add determine_rate ops for OSM CPU clock driver

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Clock rates are stored in unsigned long field, but round_rate
ops returns a long value which is causing to long overflow if
the CPU clock rate exceeds 2GHz, so define the determine_rate ops.

Change-Id: I2c48dc51bdf6be260fb4697012d08237cbba3f21
Signed-off-by: Odelu Kukatla <okukatla@codeaurora.org>
This commit is contained in:
Odelu Kukatla 2017-08-03 12:20:52 +05:30
parent 560d31410c
commit e4cd5227f0
1 changed files with 16 additions and 10 deletions
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26
drivers/clk/qcom/clk-cpu-osm.c
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@ -622,18 +622,21 @@ static inline bool is_better_rate(unsigned long req, unsigned long best,
return (req <= new && new < best) || (best < req && best < new);
}
static long clk_osm_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *parent_rate)
static int clk_osm_determine_rate(struct clk_hw *hw,
struct clk_rate_request *req)
{
int i;
unsigned long rrate = 0;
unsigned long rate = req->rate;
/*
* If the rate passed in is 0, return the first frequency in the
* FMAX table.
*/
if (!rate)
return hw->init->rate_max[0];
if (!rate) {
req->rate = hw->init->rate_max[0];
return 0;
}
for (i = 0; i < hw->init->num_rate_max; i++) {
if (is_better_rate(rate, rrate, hw->init->rate_max[i])) {
@ -643,10 +646,12 @@ static long clk_osm_round_rate(struct clk_hw *hw, unsigned long rate,
}
}
req->rate = rrate;
pr_debug("%s: rate %lu, rrate %ld, Rate max %ld\n", __func__, rate,
rrate, hw->init->rate_max[i]);
return rrate;
return 0;
}
static int clk_osm_search_table(struct osm_entry *table, int entries, long rate)
@ -677,18 +682,19 @@ static int clk_osm_set_rate(struct clk_hw *hw, unsigned long rate,
{
struct clk_osm *cpuclk = to_clk_osm(hw);
int index = 0;
unsigned long r_rate;
struct clk_rate_request req;
r_rate = clk_osm_round_rate(hw, rate, NULL);
req.rate = rate;
clk_osm_determine_rate(hw, &req);
if (rate != r_rate) {
if (rate != req.rate) {
pr_err("invalid rate requested rate=%ld\n", rate);
return -EINVAL;
}
/* Convert rate to table index */
index = clk_osm_search_table(cpuclk->osm_table,
cpuclk->num_entries, r_rate);
cpuclk->num_entries, req.rate);
if (index < 0) {
pr_err("cannot set cluster %u to %lu\n",
cpuclk->cluster_num, rate);
@ -772,7 +778,7 @@ static unsigned long clk_osm_recalc_rate(struct clk_hw *hw,
static struct clk_ops clk_ops_cpu_osm = {
.enable = clk_osm_enable,
.set_rate = clk_osm_set_rate,
.round_rate = clk_osm_round_rate,
.determine_rate = clk_osm_determine_rate,
.list_rate = clk_osm_list_rate,
.recalc_rate = clk_osm_recalc_rate,
.debug_init = clk_debug_measure_add,