coresight-tpda: skip writing '0' to FREQREQ_VAL register

FREQREQ_VAL is configured by RPM at the time of frequency switch.
TPDA enable sequence resets this register if user doesn't provide a
freq_req_val. This can be problem as it can accidentally reset the value
configured by RPM.

Change-Id: I2eb733bac700de372ae680cf74a251bb463e6650
Signed-off-by: Shashank Mittal <mittals@codeaurora.org>

diff --git a/drivers/hwtracing/coresight/coresight-tpda.c b/drivers/hwtracing/coresight/coresight-tpda.c
index e4e188f..4ccf30c 100644 (file)
--- a/drivers/hwtracing/coresight/coresight-tpda.c
+++ b/drivers/hwtracing/coresight/coresight-tpda.c
@@ -154,8 +154,6 @@ static void __tpda_enable_post_port(struct tpda_drvdata *drvdata)
 
        if (drvdata->freq_req_val)
                tpda_writel(drvdata, drvdata->freq_req_val, TPDA_FREQREQ_VAL);
-       else
-               tpda_writel(drvdata, 0x0, TPDA_FREQREQ_VAL);
 
        val = tpda_readl(drvdata, TPDA_CR);
        if (drvdata->freq_req)