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Commit 06f96b6a authored by Sudheer Papothi's avatar Sudheer Papothi
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drivers: mfd: Fix sido-buck voltage output on wcd9335 



vdd-cx supply is derived from sido-buck and is connected
to wcd9335 codec. vdd-cx supply is suddenly dropping to zero
during playback usecase that is causing no response from
codec for slimbus read/writes. Add changes to avoid sudden
drop of vdd-cx supply to wcd9335 codec.

Change-Id: I72c85bc46c41771eb969de452cf3f241ed6577f2
Signed-off-by: default avatarSudheer Papothi <spapothi@codeaurora.org>
parent 4c47f344

drivers/mfd/wcd9xxx-core.c

+4 −0
Original line number Diff line number Diff line
@@ -789,6 +789,8 @@ static void wcd9335_bring_up(struct wcd9xxx *wcd9xxx) 


	if (val & 0x80) {

		__wcd9xxx_reg_write(wcd9xxx, WCD9335_CODEC_RPM_RST_CTL, 0x01);

		__wcd9xxx_reg_write(wcd9xxx, WCD9335_SIDO_SIDO_CCL_2, 0x74);

		__wcd9xxx_reg_write(wcd9xxx, WCD9335_SIDO_SIDO_CCL_4, 0x21);

		__wcd9xxx_reg_write(wcd9xxx,

				    WCD9335_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x5);

		__wcd9xxx_reg_write(wcd9xxx,
@@ -798,6 +800,8 @@ static void wcd9335_bring_up(struct wcd9xxx *wcd9xxx) 
		__wcd9xxx_reg_write(wcd9xxx, WCD9335_CODEC_RPM_RST_CTL, 0x3);

	} else {

		__wcd9xxx_reg_write(wcd9xxx, WCD9335_CODEC_RPM_RST_CTL, 0x01);

		__wcd9xxx_reg_write(wcd9xxx, WCD9335_SIDO_SIDO_CCL_2, 0x74);

		__wcd9xxx_reg_write(wcd9xxx, WCD9335_SIDO_SIDO_CCL_4, 0x21);

		__wcd9xxx_reg_write(wcd9xxx,

				    WCD9335_CODEC_RPM_PWR_CDC_DIG_HM_CTL, 0x3);

		__wcd9xxx_reg_write(wcd9xxx, WCD9335_CODEC_RPM_RST_CTL, 0x3);