linux-kernel - [PATCH 5.4 013/203] ASoC: stm32: spdifrx: fix input pin state management

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Message-Id: <20200116231745.999662191@linuxfoundation.org>
Date:   Fri, 17 Jan 2020 00:15:30 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Olivier Moysan <olivier.moysan@...com>,
        Mark Brown <broonie@...nel.org>
Subject: [PATCH 5.4 013/203] ASoC: stm32: spdifrx: fix input pin state management

From: Olivier Moysan <olivier.moysan@...com>

commit 3b7658679d88b5628939f9bdc8e613f79cd821f9 upstream.

Changing input state in iec capture control is not safe,
as the pin state may be changed concurrently by ASoC
framework.
Remove pin state handling in iec capture control.

Note: This introduces a restriction on capture control,
when pin sleep state is defined in device tree. In this case
channel status can be captured only when an audio stream
capture is active.

Fixes: f68c2a682d44 ("ASoC: stm32: spdifrx: add power management")

Signed-off-by: Olivier Moysan <olivier.moysan@...com>
Link: https://lore.kernel.org/r/20191204154333.7152-4-olivier.moysan@st.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/soc/stm/stm32_spdifrx.c |    4 ----
 1 file changed, 4 deletions(-)

--- a/sound/soc/stm/stm32_spdifrx.c
+++ b/sound/soc/stm/stm32_spdifrx.c
@@ -12,7 +12,6 @@
 #include <linux/delay.h>
 #include <linux/module.h>
 #include <linux/of_platform.h>
-#include <linux/pinctrl/consumer.h>
 #include <linux/regmap.h>
 #include <linux/reset.h>
 
@@ -482,8 +481,6 @@ static int stm32_spdifrx_get_ctrl_data(s
 	memset(spdifrx->cs, 0, SPDIFRX_CS_BYTES_NB);
 	memset(spdifrx->ub, 0, SPDIFRX_UB_BYTES_NB);
 
-	pinctrl_pm_select_default_state(&spdifrx->pdev->dev);
-
 	ret = stm32_spdifrx_dma_ctrl_start(spdifrx);
 	if (ret < 0)
 		return ret;
@@ -515,7 +512,6 @@ static int stm32_spdifrx_get_ctrl_data(s
 
 end:
 	clk_disable_unprepare(spdifrx->kclk);
-	pinctrl_pm_select_sleep_state(&spdifrx->pdev->dev);
 
 	return ret;
 }