Commit 3833d0ab authored by Alex Elder's avatar Alex Elder Committed by David S. Miller
Browse files

net: ipa: disable misc clock gating for IPA v3.1 

For IPA v3.1, a workaround is needed to disable gating on a MISC
clock.  I have no further explanation, but this is what the
downstream code (msm-4.4) does.

This was suggested in a patch from AngeloGioacchino Del Regno.

Link: https://lore.kernel.org/netdev/20210211175015.200772-2-angelogioacchino.delregno@somainline.org


Signed-off-by: default avatarAlex Elder <elder@linaro.org>
Acked-by: AngeloGioacchino Del Regno
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c31d7349

drivers/net/ipa/ipa_main.c

+9 −5
Original line number Diff line number Diff line
@@ -400,16 +400,20 @@ static void ipa_hardware_config(struct ipa *ipa, const struct ipa_data *data) 


	/* Implement some hardware workarounds */

	if (version >= IPA_VERSION_4_0 && version < IPA_VERSION_4_5) {

		/* Enable open global clocks (not needed for IPA v4.5) */

		val = GLOBAL_FMASK;

		val |= GLOBAL_2X_CLK_FMASK;

		iowrite32(val, ipa->reg_virt + IPA_REG_CLKON_CFG_OFFSET);



		/* Disable PA mask to allow HOLB drop */

		val = ioread32(ipa->reg_virt + IPA_REG_TX_CFG_OFFSET);

		val &= ~PA_MASK_EN_FMASK;

		iowrite32(val, ipa->reg_virt + IPA_REG_TX_CFG_OFFSET);



		/* Enable open global clocks in the CLKON configuration */

		val = GLOBAL_FMASK | GLOBAL_2X_CLK_FMASK;

	} else if (version == IPA_VERSION_3_1) {

		val = MISC_FMASK;	/* Disable MISC clock gating */

	} else {

		val = 0;		/* No CLKON configuration needed */

	}

	if (val)

		iowrite32(val, ipa->reg_virt + IPA_REG_CLKON_CFG_OFFSET);



	ipa_hardware_config_comp(ipa);