On 11/07, Ritesh Harjani wrote:
> diff --git a/drivers/clk/qcom/clk-rcg.h b/drivers/clk/qcom/clk-rcg.h
> index b904c33..1b3e8d2 100644
> --- a/drivers/clk/qcom/clk-rcg.h
> +++ b/drivers/clk/qcom/clk-rcg.h
> @@ -173,6 +173,7 @@ struct clk_rcg2 {
> #define to_clk_rcg2(_hw) container_of(to_clk_regmap(_hw), struct clk_rcg2, clkr)
>
> extern const struct clk_ops clk_rcg2_ops;
> +extern const struct clk_ops clk_rcg2_floor_ops;
> extern const struct clk_ops clk_rcg2_shared_ops;
> extern const struct clk_ops clk_edp_pixel_ops;
> extern const struct clk_ops clk_byte_ops;
> diff --git a/drivers/clk/qcom/clk-rcg2.c b/drivers/clk/qcom/clk-rcg2.c
> index a071bba..04433a6 100644
> --- a/drivers/clk/qcom/clk-rcg2.c
> +++ b/drivers/clk/qcom/clk-rcg2.c
> @@ -47,6 +47,11 @@
> #define N_REG 0xc
> #define D_REG 0x10
>
> +enum {
> + FLOOR,
> + CEIL,
> +};
Give it a name.
> +
> static int clk_rcg2_is_enabled(struct clk_hw *hw)
> {
> struct clk_rcg2 *rcg = to_clk_rcg2(hw);
> @@ -176,15 +181,25 @@ static int clk_rcg2_set_parent(struct clk_hw *hw, u8 index)
> return calc_rate(parent_rate, m, n, mode, hid_div);
> }
>
> -static int _freq_tbl_determine_rate(struct clk_hw *hw,
> - const struct freq_tbl *f, struct clk_rate_request *req)
> +static int _freq_tbl_determine_rate(struct clk_hw *hw, const struct freq_tbl *f,
> + struct clk_rate_request *req, bool match)
Use the enum please. Also name it something besides match.
policy?
> {
> unsigned long clk_flags, rate = req->rate;
> struct clk_hw *p;
> struct clk_rcg2 *rcg = to_clk_rcg2(hw);
> int index;
>
> - f = qcom_find_freq(f, rate);
> + switch (match) {
> + case FLOOR:
> + f = qcom_find_freq_floor(f, rate);
> + break;
> + case CEIL:
> + f = qcom_find_freq(f, rate);
> + break;
> + default:
> + return -EINVAL;
> + };
> +
> if (!f)
> return -EINVAL;
>
> diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
> index fffcbaf..cf6b87f 100644
> --- a/drivers/clk/qcom/common.c
> +++ b/drivers/clk/qcom/common.c
> @@ -46,6 +46,32 @@ struct freq_tbl *qcom_find_freq(const struct freq_tbl *f, unsigned long rate)
> }
> EXPORT_SYMBOL_GPL(qcom_find_freq);
>
> +const
> +struct freq_tbl *qcom_find_freq_floor(const struct freq_tbl *f,
We can't put const and struct on the same line?
> + unsigned long rate)
> +{
> + int size = 0;
> +
> + if (!f)
> + return NULL;
> +
> + /*
> + * The freq table has entries in the ascending order of frequencies
> + * To find the floor for a given frequency, we need to do a reverse
> + * lookup of the table
> + */
> + for (; f->freq; f++, size++)
> + ;
> +
> + for (f--; size; f--, size--)
> + if (rate >= f->freq)
> + return f;
I don't understand why we can't do this while iterating through
the table. We shouldn't need to size up the frequency table first.
const struct freq_tbl *best = NULL;
for ( ; f->freq; f++) {
if (rate >= f->freq)
best = f->freq;
else
break;
}
return best;
> +
> + /* could not find any rates lower than *rate* */
> + return NULL;
> +}
> +EXPORT_SYMBOL_GPL(qcom_find_freq_floor);
--
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