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clk: qcom: Check for errors during RCG read

Browse source 
There could be instances where the RCG configuration update or readback
could fail. Notify the caller of the failure. Add support to change
scope of mux_div_get_src_div() in order to use it globally.

Change-Id: Ica07c28cede695785db81697effcb40ab6b717d4
Signed-off-by: Amit Nischal <anischal@codeaurora.org>
Signed-off-by: Taniya Das <tdas@codeaurora.org>
Signed-off-by: Naveen Yadav <naveenky@codeaurora.org>
This commit is contained in:
Amit Nischal 2017-06-14 10:45:46 +05:30 • committed by Naveen Yadav
commit 203a3ea2cd
2 changed files with 14 additions and 5 deletions
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18
drivers/clk/qcom/clk-regmap-mux-div.c
View file

@ -56,20 +56,26 @@ int mux_div_set_src_div(struct clk_regmap_mux_div *md, u32 src, u32 div)
}
EXPORT_SYMBOL_GPL(mux_div_set_src_div);
static void mux_div_get_src_div(struct clk_regmap_mux_div *md, u32 *src,
u32 *div)
int mux_div_get_src_div(struct clk_regmap_mux_div *md, u32 *src,
u32 *div)
{
int ret = 0;
u32 val, d, s;
const char *name = clk_hw_get_name(&md->clkr.hw);
regmap_read(md->clkr.regmap, CMD_RCGR + md->reg_offset, &val);
ret = regmap_read(md->clkr.regmap, CMD_RCGR + md->reg_offset, &val);
if (ret)
return ret;
if (val & CMD_RCGR_DIRTY_CFG) {
pr_err("%s: RCG configuration is pending\n", name);
return;
return -EBUSY;
}
regmap_read(md->clkr.regmap, CFG_RCGR + md->reg_offset, &val);
ret = regmap_read(md->clkr.regmap, CFG_RCGR + md->reg_offset, &val);
if (ret)
return ret;
s = (val >> md->src_shift);
s &= BIT(md->src_width) - 1;
*src = s;
@ -77,6 +83,8 @@ static void mux_div_get_src_div(struct clk_regmap_mux_div *md, u32 *src,
d = (val >> md->hid_shift);
d &= BIT(md->hid_width) - 1;
*div = d;
return ret;
}
static inline bool is_better_rate(unsigned long req, unsigned long best,

1
drivers/clk/qcom/clk-regmap-mux-div.h
View file

@ -40,5 +40,6 @@ struct clk_regmap_mux_div {
extern const struct clk_ops clk_regmap_mux_div_ops;
extern int mux_div_set_src_div(struct clk_regmap_mux_div *md, u32 src, u32 div);
int mux_div_get_src_div(struct clk_regmap_mux_div *md, u32 *src, u32 *div);
#endif