linux-kernel - [PATCH v1 11/12] ASoC: rockchip: pdm: Mark RXFIFO

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Date:   Thu,  4 Apr 2019 11:57:08 +0800
From:   Sugar Zhang <sugar.zhang@...k-chips.com>
To:     heiko@...ech.de, broonie@...nel.org
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>, alsa-devel@...a-project.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Sugar Zhang <sugar.zhang@...k-chips.com>
Subject: [PATCH v1 11/12] ASoC: rockchip: pdm: Mark RXFIFO_DATA as volatile and precious

This patch marks RXFIFO_DATA as precious to avoid being read
outside a call from the driver, such as regmap debugfs

Signed-off-by: Sugar Zhang <sugar.zhang@...k-chips.com>
---

 sound/soc/rockchip/rockchip_pdm.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/sound/soc/rockchip/rockchip_pdm.c b/sound/soc/rockchip/rockchip_pdm.c
index 955cdc2..e89beeb 100644
--- a/sound/soc/rockchip/rockchip_pdm.c
+++ b/sound/soc/rockchip/rockchip_pdm.c
@@ -415,6 +415,7 @@ static bool rockchip_pdm_rd_reg(struct device *dev, unsigned int reg)
 	case PDM_INT_CLR:
 	case PDM_INT_ST:
 	case PDM_DATA_VALID:
+	case PDM_RXFIFO_DATA:
 	case PDM_VERSION:
 		return true;
 	default:
@@ -429,6 +430,17 @@ static bool rockchip_pdm_volatile_reg(struct device *dev, unsigned int reg)
 	case PDM_FIFO_CTRL:
 	case PDM_INT_CLR:
 	case PDM_INT_ST:
+	case PDM_RXFIFO_DATA:
+		return true;
+	default:
+		return false;
+	}
+}
+
+static bool rockchip_pdm_precious_reg(struct device *dev, unsigned int reg)
+{
+	switch (reg) {
+	case PDM_RXFIFO_DATA:
 		return true;
 	default:
 		return false;
@@ -451,6 +463,7 @@ static const struct regmap_config rockchip_pdm_regmap_config = {
 	.writeable_reg = rockchip_pdm_wr_reg,
 	.readable_reg = rockchip_pdm_rd_reg,
 	.volatile_reg = rockchip_pdm_volatile_reg,
+	.precious_reg = rockchip_pdm_precious_reg,
 	.cache_type = REGCACHE_FLAT,
 };
 
-- 
2.7.4