net: ipa: HOLB register sometimes must be written twice

Starting with IPA v4.5, the HOL_BLOCK_EN register must be written
twice when enabling head-of-line blocking avoidance.

Fixes: e66f933cb5e18 ("soc: qcom: ipa: IPA endpoints")
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ipa/ipa_endpoint.c b/drivers/net/ipa/ipa_endpoint.c
index 5528d97110d56de1825c7bc4c2c7896ce034b586..006da4642a0ba5beb912833b4d5222dabf36a8f0 100644 (file)
--- a/drivers/net/ipa/ipa_endpoint.c
+++ b/drivers/net/ipa/ipa_endpoint.c
@@ -868,6 +868,9 @@ ipa_endpoint_init_hol_block_enable(struct ipa_endpoint *endpoint, bool enable)
        val = enable ? HOL_BLOCK_EN_FMASK : 0;
        offset = IPA_REG_ENDP_INIT_HOL_BLOCK_EN_N_OFFSET(endpoint_id);
        iowrite32(val, endpoint->ipa->reg_virt + offset);
+       /* When enabling, the register must be written twice for IPA v4.5+ */
+       if (enable && endpoint->ipa->version >= IPA_VERSION_4_5)
+               iowrite32(val, endpoint->ipa->reg_virt + offset);
 }
 
 void ipa_endpoint_modem_hol_block_clear_all(struct ipa *ipa)