[PATCH v2 1/3] soundwire: qcom: clear BIT FIELDs before value set.

[Srinivas Kandagatla]

According to usage (bitfields.h) of REG_FIELDS,
Modify is:
  reg &= ~REG_FIELD_C;
  reg |= FIELD_PREP(REG_FIELD_C, c);

Patch ("soundwire: qcom : use FIELD_{GET|PREP}") seems to have
accidentally removed clearing bit field while modifying the register.

Fix this by adding back clear register mask before setting it up!

Signed-off-by: Srinivas Kandagatla <srinivas.kandaga...@linaro.org>
---
 drivers/soundwire/qcom.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/soundwire/qcom.c b/drivers/soundwire/qcom.c
index d7aabdaffee3..5d26361ab4f6 100644
--- a/drivers/soundwire/qcom.c
+++ b/drivers/soundwire/qcom.c
@@ -311,6 +311,7 @@ static int qcom_swrm_init(struct qcom_swrm_ctrl *ctrl)
 
        /* Configure No pings */
        ctrl->reg_read(ctrl, SWRM_MCP_CFG_ADDR, &val);
+       val &= ~SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_BMSK;
        val |= FIELD_PREP(SWRM_MCP_CFG_MAX_NUM_OF_CMD_NO_PINGS_BMSK, 
SWRM_DEF_CMD_NO_PINGS);
        ctrl->reg_write(ctrl, SWRM_MCP_CFG_ADDR, val);
 
@@ -372,6 +373,9 @@ static int qcom_swrm_pre_bank_switch(struct sdw_bus *bus)
 
        ctrl->reg_read(ctrl, reg, &val);
 
+       val &= ~SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_BMSK;
+       val &= ~SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_BMSK;
+
        val |= FIELD_PREP(SWRM_MCP_FRAME_CTRL_BANK_COL_CTRL_BMSK, 
SWRM_MAX_COL_VAL);
        val |= FIELD_PREP(SWRM_MCP_FRAME_CTRL_BANK_ROW_CTRL_BMSK, 
SWRM_MAX_ROW_VAL);
 
-- 
2.21.0