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soundwire: bus: test read status

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In the existing code we may read a negative error value but still mask
it and write it back.

Make sure all reads are tested and errors not propagated further.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210302091122.13952-3-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2021-03-02 17:11:13 +08:00 committed by Vinod Koul
parent 0196b52b83
commit 665cf215bc
1 changed files with 12 additions and 4 deletions
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16
drivers/soundwire/bus.c
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@ -875,8 +875,12 @@ static int sdw_slave_clk_stop_prepare(struct sdw_slave *slave,
if (wake_en)
val |= SDW_SCP_SYSTEMCTRL_WAKE_UP_EN;
} else {
val = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL);
ret = sdw_read_no_pm(slave, SDW_SCP_SYSTEMCTRL);
if (ret < 0) {
dev_err(&slave->dev, "SDW_SCP_SYSTEMCTRL read failed:%d\n", ret);
return ret;
}
val = ret;
val &= ~(SDW_SCP_SYSTEMCTRL_CLK_STP_PREP);
}
@ -895,8 +899,12 @@ static int sdw_bus_wait_for_clk_prep_deprep(struct sdw_bus *bus, u16 dev_num)
int val;
do {
val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT) &
SDW_SCP_STAT_CLK_STP_NF;
val = sdw_bread_no_pm(bus, dev_num, SDW_SCP_STAT);
if (val < 0) {
dev_err(bus->dev, "SDW_SCP_STAT bread failed:%d\n", val);
return val;
}
val &= SDW_SCP_STAT_CLK_STP_NF;
if (!val) {
dev_info(bus->dev, "clock stop prep/de-prep done slave:%d",
dev_num);