From 218b95bac6bec1d5d2ea4625528ba82b81b5f0fa Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Fri, 5 May 2023 13:25:48 +0200 Subject: ASoC: tlv320aic32x4: Add a determine_rate hook The tlv320aic32x4 clkin clock implements a mux with a set_parent hook, but doesn't provide a determine_rate implementation. This is a bit odd, since set_parent() is there to, as its name implies, change the parent of a clock. However, the most likely candidates to trigger that parent change are either the assigned-clock-parents device tree property or a call to clk_set_rate(), with determine_rate() figuring out which parent is the best suited for a given rate. The other trigger would be a call to clk_set_parent(), but it's far less used, and it doesn't look like there's any obvious user for that clock. Similarly, it doesn't look like the device tree using that clock driver uses any of the assigned-clock properties on that clock. So, the set_parent hook is effectively unused, possibly because of an oversight. However, it could also be an explicit decision by the original author to avoid any reparenting but through an explicit call to clk_set_parent(). The latter case would be equivalent to setting the determine_rate implementation to clk_hw_determine_rate_no_reparent(). Indeed, if no determine_rate implementation is provided, clk_round_rate() (through clk_core_round_rate_nolock()) will call itself on the parent if CLK_SET_RATE_PARENT is set, and will not change the clock rate otherwise. And if it was an oversight, then we are at least explicit about our behavior now and it can be further refined down the line. Cc: Jaroslav Kysela Cc: Liam Girdwood Cc: Mark Brown Cc: Takashi Iwai Cc: alsa-devel@alsa-project.org Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v4-46-971d5077e7d2@cerno.tech Signed-off-by: Stephen Boyd --- sound/soc/codecs/tlv320aic32x4-clk.c | 1 + 1 file changed, 1 insertion(+) (limited to 'sound/soc/codecs') diff --git a/sound/soc/codecs/tlv320aic32x4-clk.c b/sound/soc/codecs/tlv320aic32x4-clk.c index 2f78e6820c75..80cbc6bc6847 100644 --- a/sound/soc/codecs/tlv320aic32x4-clk.c +++ b/sound/soc/codecs/tlv320aic32x4-clk.c @@ -292,6 +292,7 @@ static u8 clk_aic32x4_codec_clkin_get_parent(struct clk_hw *hw) } static const struct clk_ops aic32x4_codec_clkin_ops = { + .determine_rate = clk_hw_determine_rate_no_reparent, .set_parent = clk_aic32x4_codec_clkin_set_parent, .get_parent = clk_aic32x4_codec_clkin_get_parent, }; -- cgit v1.2.3 From 25d43ec352eaefbfaee0912d02b6f10ea606931f Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Fri, 5 May 2023 13:26:08 +0200 Subject: ASoC: tlv320aic32x4: pll: Switch to determine_rate The tlv320aic32x4 PLL clocks implements a mux with a set_parent hook, but doesn't provide a determine_rate implementation. This is a bit odd, since set_parent() is there to, as its name implies, change the parent of a clock. However, the most likely candidate to trigger that parent change is a call to clk_set_rate(), with determine_rate() figuring out which parent is the best suited for a given rate. The other trigger would be a call to clk_set_parent(), but it's far less used, and it doesn't look like there's any obvious user for that clock. So, the set_parent hook is effectively unused, possibly because of an oversight. However, it could also be an explicit decision by the original author to avoid any reparenting but through an explicit call to clk_set_parent(). The driver does implement round_rate() though, which means that we can change the rate of the clock, but we will never get to change the parent. However, It's hard to tell whether it's been done on purpose or not. Since we'll start mandating a determine_rate() implementation, let's convert the round_rate() implementation to a determine_rate(), which will also make the current behavior explicit. And if it was an oversight, the clock behaviour can be adjusted later on. Cc: Jaroslav Kysela Cc: Liam Girdwood Cc: Mark Brown Cc: Takashi Iwai Cc: alsa-devel@alsa-project.org Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v4-66-971d5077e7d2@cerno.tech Signed-off-by: Stephen Boyd --- sound/soc/codecs/tlv320aic32x4-clk.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) (limited to 'sound/soc/codecs') diff --git a/sound/soc/codecs/tlv320aic32x4-clk.c b/sound/soc/codecs/tlv320aic32x4-clk.c index 80cbc6bc6847..e2de4617ab09 100644 --- a/sound/soc/codecs/tlv320aic32x4-clk.c +++ b/sound/soc/codecs/tlv320aic32x4-clk.c @@ -204,18 +204,23 @@ static unsigned long clk_aic32x4_pll_recalc_rate(struct clk_hw *hw, return clk_aic32x4_pll_calc_rate(&settings, parent_rate); } -static long clk_aic32x4_pll_round_rate(struct clk_hw *hw, - unsigned long rate, - unsigned long *parent_rate) +static int clk_aic32x4_pll_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) { struct clk_aic32x4_pll_muldiv settings; + unsigned long rate; int ret; - ret = clk_aic32x4_pll_calc_muldiv(&settings, rate, *parent_rate); + ret = clk_aic32x4_pll_calc_muldiv(&settings, req->rate, req->best_parent_rate); if (ret < 0) - return 0; + return -EINVAL; - return clk_aic32x4_pll_calc_rate(&settings, *parent_rate); + rate = clk_aic32x4_pll_calc_rate(&settings, req->best_parent_rate); + if (rate < 0) + return rate; + + req->rate = rate; + return 0; } static int clk_aic32x4_pll_set_rate(struct clk_hw *hw, @@ -266,7 +271,7 @@ static const struct clk_ops aic32x4_pll_ops = { .unprepare = clk_aic32x4_pll_unprepare, .is_prepared = clk_aic32x4_pll_is_prepared, .recalc_rate = clk_aic32x4_pll_recalc_rate, - .round_rate = clk_aic32x4_pll_round_rate, + .determine_rate = clk_aic32x4_pll_determine_rate, .set_rate = clk_aic32x4_pll_set_rate, .set_parent = clk_aic32x4_pll_set_parent, .get_parent = clk_aic32x4_pll_get_parent, -- cgit v1.2.3 From 2b6c9b0eee89379fda238d543c5acf098a2ac5a5 Mon Sep 17 00:00:00 2001 From: Maxime Ripard Date: Fri, 5 May 2023 13:26:09 +0200 Subject: ASoC: tlv320aic32x4: div: Switch to determine_rate The tlv320aic32x4 divider clocks implements a mux with a set_parent hook, but doesn't provide a determine_rate implementation. This is a bit odd, since set_parent() is there to, as its name implies, change the parent of a clock. However, the most likely candidate to trigger that parent change is a call to clk_set_rate(), with determine_rate() figuring out which parent is the best suited for a given rate. The other trigger would be a call to clk_set_parent(), but it's far less used, and it doesn't look like there's any obvious user for that clock. So, the set_parent hook is effectively unused, possibly because of an oversight. However, it could also be an explicit decision by the original author to avoid any reparenting but through an explicit call to clk_set_parent(). The driver does implement round_rate() though, which means that we can change the rate of the clock, but we will never get to change the parent. However, It's hard to tell whether it's been done on purpose or not. Since we'll start mandating a determine_rate() implementation, let's convert the round_rate() implementation to a determine_rate(), which will also make the current behavior explicit. And if it was an oversight, the clock behaviour can be adjusted later on. Cc: Jaroslav Kysela Cc: Liam Girdwood Cc: Mark Brown Cc: Takashi Iwai Cc: alsa-devel@alsa-project.org Signed-off-by: Maxime Ripard Link: https://lore.kernel.org/r/20221018-clk-range-checks-fixes-v4-67-971d5077e7d2@cerno.tech Signed-off-by: Stephen Boyd --- sound/soc/codecs/tlv320aic32x4-clk.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) (limited to 'sound/soc/codecs') diff --git a/sound/soc/codecs/tlv320aic32x4-clk.c b/sound/soc/codecs/tlv320aic32x4-clk.c index e2de4617ab09..a7ec501b4c69 100644 --- a/sound/soc/codecs/tlv320aic32x4-clk.c +++ b/sound/soc/codecs/tlv320aic32x4-clk.c @@ -332,16 +332,17 @@ static int clk_aic32x4_div_set_rate(struct clk_hw *hw, unsigned long rate, AIC32X4_DIV_MASK, divisor); } -static long clk_aic32x4_div_round_rate(struct clk_hw *hw, unsigned long rate, - unsigned long *parent_rate) +static int clk_aic32x4_div_determine_rate(struct clk_hw *hw, + struct clk_rate_request *req) { unsigned long divisor; - divisor = DIV_ROUND_UP(*parent_rate, rate); + divisor = DIV_ROUND_UP(req->best_parent_rate, req->rate); if (divisor > 128) return -EINVAL; - return DIV_ROUND_UP(*parent_rate, divisor); + req->rate = DIV_ROUND_UP(req->best_parent_rate, divisor); + return 0; } static unsigned long clk_aic32x4_div_recalc_rate(struct clk_hw *hw, @@ -360,7 +361,7 @@ static const struct clk_ops aic32x4_div_ops = { .prepare = clk_aic32x4_div_prepare, .unprepare = clk_aic32x4_div_unprepare, .set_rate = clk_aic32x4_div_set_rate, - .round_rate = clk_aic32x4_div_round_rate, + .determine_rate = clk_aic32x4_div_determine_rate, .recalc_rate = clk_aic32x4_div_recalc_rate, }; @@ -388,7 +389,7 @@ static const struct clk_ops aic32x4_bdiv_ops = { .set_parent = clk_aic32x4_bdiv_set_parent, .get_parent = clk_aic32x4_bdiv_get_parent, .set_rate = clk_aic32x4_div_set_rate, - .round_rate = clk_aic32x4_div_round_rate, + .determine_rate = clk_aic32x4_div_determine_rate, .recalc_rate = clk_aic32x4_div_recalc_rate, }; -- cgit v1.2.3 From 3e253b21693d08126c828cddcb4fd3949898f773 Mon Sep 17 00:00:00 2001 From: Stephen Boyd Date: Mon, 12 Jun 2023 18:12:00 -0700 Subject: ASoC: tlv320aic32x4: pll: Remove impossible condition in clk_aic32x4_pll_determine_rate() Smatch warns: sound/soc/codecs/tlv320aic32x4-clk.c:219 clk_aic32x4_pll_determine_rate() warn: unsigned 'rate' is never less than zero. Cc: Maxime Ripard Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202306101217.08CRVGcK-lkp@intel.com/ Fixes: 25d43ec352ea ("ASoC: tlv320aic32x4: pll: Switch to determine_rate") Signed-off-by: Stephen Boyd Link: https://lore.kernel.org/r/20230613011201.1166753-1-sboyd@kernel.org Reviewed-by: Maxime Ripard --- sound/soc/codecs/tlv320aic32x4-clk.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) (limited to 'sound/soc/codecs') diff --git a/sound/soc/codecs/tlv320aic32x4-clk.c b/sound/soc/codecs/tlv320aic32x4-clk.c index a7ec501b4c69..c116e82f712d 100644 --- a/sound/soc/codecs/tlv320aic32x4-clk.c +++ b/sound/soc/codecs/tlv320aic32x4-clk.c @@ -208,18 +208,14 @@ static int clk_aic32x4_pll_determine_rate(struct clk_hw *hw, struct clk_rate_request *req) { struct clk_aic32x4_pll_muldiv settings; - unsigned long rate; int ret; ret = clk_aic32x4_pll_calc_muldiv(&settings, req->rate, req->best_parent_rate); if (ret < 0) return -EINVAL; - rate = clk_aic32x4_pll_calc_rate(&settings, req->best_parent_rate); - if (rate < 0) - return rate; + req->rate = clk_aic32x4_pll_calc_rate(&settings, req->best_parent_rate); - req->rate = rate; return 0; } -- cgit v1.2.3