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

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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: Alex Elder <elder@linaro.org>
Acked-by: AngeloGioacchino Del Regno
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alex Elder 2021-06-21 12:56:24 -05:00 committed by David S. Miller
parent c31d73494f
commit 3833d0abd2
1 changed files with 9 additions and 5 deletions
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14
drivers/net/ipa/ipa_main.c
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@ -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);