[PATCH v3 10/18] coresight tmc: Handle configuration types properly
From: suzuki.poulose@arm.com (Suzuki K Poulose)
Date: 2017-07-14 13:07:48
Also in:
lkml
Subsystem:
arm/coresight framework and drivers, hardware tracing facilities, the rest · Maintainers:
Suzuki K Poulose, Alexander Shishkin, Linus Torvalds
Coresight SoC 600 defines a new configuration for TMC, Embedded Trace Streamer (ETS), indicated by 0x3 in MODE:CONFIG_TYPE. This would break the existing driver which will treat anything other than ETR/ETB as an ETF. Fix the driver to check the configuration type properly and also add a warning if we encounter an unsupported configuration (ETS). Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> --- drivers/hwtracing/coresight/coresight-tmc.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 6bf4170..73184a1 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c@@ -358,11 +358,13 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id) desc.dev = dev; desc.groups = coresight_tmc_groups; - if (drvdata->config_type == TMC_CONFIG_TYPE_ETB) { + switch (drvdata->config_type) { + case TMC_CONFIG_TYPE_ETB: desc.type = CORESIGHT_DEV_TYPE_SINK; desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER; desc.ops = &tmc_etb_cs_ops; - } else if (drvdata->config_type == TMC_CONFIG_TYPE_ETR) { + break; + case TMC_CONFIG_TYPE_ETR: desc.type = CORESIGHT_DEV_TYPE_SINK; desc.subtype.sink_subtype = CORESIGHT_DEV_SUBTYPE_SINK_BUFFER; desc.ops = &tmc_etr_cs_ops;
@@ -373,10 +375,16 @@ static int tmc_probe(struct amba_device *adev, const struct amba_id *id) ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40)); if (ret) goto out; - } else { + break; + case TMC_CONFIG_TYPE_ETF: desc.type = CORESIGHT_DEV_TYPE_LINKSINK; desc.subtype.link_subtype = CORESIGHT_DEV_SUBTYPE_LINK_FIFO; desc.ops = &tmc_etf_cs_ops; + break; + default: + pr_err("%s: Unsupported TMC config\n", pdata->name); + ret = -EINVAL; + goto out; } drvdata->csdev = coresight_register(&desc);
--
2.7.5