During mt8195_afe_init_clock(), mt8195_audsys_clk_register() was called
followed by several other devm functions. At mt8195_afe_deinit_clock()
located at mt8195_afe_pcm_dev_remove(), mt8195_audsys_clk_unregister()
was called.
However, there was an issue with the order in which these functions were
called. Specifically, the remove callback of platform_driver was called
before devres released the resource, resulting in a use-after-free issue
during remove time.
At probe time, the order of calls was:
1. mt8195_audsys_clk_register
2. afe_priv->clk = devm_kcalloc
3. afe_priv->clk[i] = devm_clk_get
At remove time, the order of calls was:
1. mt8195_audsys_clk_unregister
3. free afe_priv->clk[i]
2. free afe_priv->clk
To resolve the problem, we can utilize devm_add_action_or_reset() in
mt8195_audsys_clk_register() so that the remove order can be changed to
3->2->1.
Fixes: 6746cc8582 ("ASoC: mediatek: mt8195: add platform driver")
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20230601033318.10408-3-trevor.wu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Audio tuner is used to handle clock drift between 26M and APLL domain.
It's expected when abs(chg_cnt) equals to upper bound, tuner updates pcw
setting automatically, and then abs(chg_cnt) decreases.
In the stress test, we found abs(chg_cnt) possibly equals to 2 at the
unexpected timing. This results in wrong pcw updating.
Finally, abs(chg_cnt) will always be larger than upper bound,
As a result, we update the upper bound to 3 to handle the corner case.
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220927151141.11846-1-trevor.wu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
cppcheck warnings:
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:311:9: warning: Identical
condition and return expression 'ret', return value is always 0
[identicalConditionAfterEarlyExit]
return ret;
^
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:297:6: note: If condition
'ret' is true, the function will return/exit
if (ret)
^
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:311:9: note: Returning
identical expression 'ret'
return ret;
^
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:341:9: warning: Identical
condition and return expression 'ret', return value is always 0
[identicalConditionAfterEarlyExit]
return ret;
^
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:338:6: note: If condition
'ret' is true, the function will return/exit
if (ret)
^
sound/soc/mediatek/mt8195/mt8195-afe-clk.c:341:9: note: Returning
identical expression 'ret'
return ret;
^
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20220520211719.607543-12-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Normally, the clock source of audio module is either 26M or APLL1/APLL2,
but APLL1/APLL2 are not the multiple of 26M.
In the patch, APLL1 and APLL2 tuners are enabled to handle sample rate
mismatch when the data path crosses two different clock domains.
Signed-off-by: Trevor Wu <trevor.wu@mediatek.com>
Link: https://lore.kernel.org/r/20220221055716.18580-1-trevor.wu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Don't populate various arrays on the stack but instead make them
static const. Also makes the object code smaller by a few hundred
bytes.
Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Link: https://lore.kernel.org/r/20211129224236.506883-1-colin.i.king@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>
