On 22/03/16 20:23, Mathieu Poirier wrote:
In their current implementation the tmc_read_prepare/unprepare()
are a lump of if/else that is difficult to read. This patch is
alleviating that by using a switch statement. The latter also
allows for a better control on the error path.
Signed-off-by: Mathieu Poirier <[email protected]>
---
drivers/hwtracing/coresight/coresight-tmc.c | 56 ++++++++++++++++++-----------
1 file changed, 36 insertions(+), 20 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c
b/drivers/hwtracing/coresight/coresight-tmc.c
index f4ba837a0810..208d47dd3083 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -430,7 +430,7 @@ static const struct coresight_ops tmc_etf_cs_ops = {
- if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) {
+ switch (drvdata->config_type) {
+ case TMC_CONFIG_TYPE_ETB:
tmc_etb_disable_hw(drvdata);
- } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) {
- tmc_etr_disable_hw(drvdata);
- } else {
+ break;
+ case TMC_CONFIG_TYPE_ETF:
+ /* There is no point in reading a TMC in HW FIFO mode */
mode = readl_relaxed(drvdata->base + TMC_MODE);
- if (mode == TMC_MODE_CIRCULAR_BUFFER) {
- tmc_etb_disable_hw(drvdata);
- } else {
- ret = -ENODEV;
+ if (mode != TMC_MODE_CIRCULAR_BUFFER) {
+ ret = -EINVAL;
goto err;
}
+
+ tmc_etb_disable_hw(drvdata);
+ break;
+ case TMC_CONFIG_TYPE_ETR:
+ tmc_etr_disable_hw(drvdata);
+ break;
+ default:
+ ret = -EINVAL;
+ goto err;
}
We seem to be doing this switch at different places in the code just for
enable_hw/disable_hw.
e.g, tmc_enable, tmc_disable
Could we make this a bit more cleaner by introducing something like this ?
struct tmc_hw_ops {
int (*enable_hw)(struct tmc_drvdata *drvdata, enum tmc_mode mode);
int (*disable_hw)(struct tmc_drvdata *drvdata, enum tmc_mode mode);
};
struct tmc_hw_ops tmc_etf_ops = {
tmc_etf_enable_hw,
tmc_etf_disable_hw,
};
similiarly for etb and etr and then add struct tmc_hw_ops *hw_ops to
tmc_drvdata, initialised
at probe time (while reading the config_type).
Suzuki
