[S] Change in coreboot[main]: mb/google/nissa/var/anraggar: Force audio mute to avoid screen flick

[Simon Yang (Code Review)]

Attention is currently required from: Dinesh Gehlot, Eric Lai, Jayvik Desai, Jianeng Ceng, Kapil Porwal, Nick Vaccaro, Rishika Raj, Shou-Chieh Hsu, Subrata Banik.

Simon Yang has posted comments on this change by Simon Yang. ( https://review.coreboot.org/c/coreboot/+/84098?usp=email )

Change subject: mb/google/nissa/var/anraggar: Force audio mute to avoid screen flick
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Patch Set 5:

(3 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/84098/comment/9ed02e07_78d31aa5?usp... :
PS3, Line 8: 
           : Panel CSOT MNB601LS1-3 will flicker once during enter Chrome login screen,
           : it is because it inserts 12 blank frames if it receives the unmute in VB-ID.
           :
> wrap up text ?

Done

File src/mainboard/google/brya/variants/anraggar/variant.c:

https://review.coreboot.org/c/coreboot/+/84098/comment/2204f145_b651e11f?usp... :
PS3, Line 53: * Panel CSOT MNB601LS1-3 will flicker once during enter Chrome login screen,
            : 	* it is because it inserts 12 blank frames if it receives the unmute in VB-ID.
            : 	*
            : 	* Always override the mute in VB-ID to avoid Tcon EC detected the
            : 	* audiomute_flag change.
            : 	*
> need one space to start with

Done

https://review.coreboot.org/c/coreboot/+/84098/comment/4633bee8_e0e55796?usp... :
PS3, Line 59: 	u32 ddi_buf_ctl2 = graphics_gtt_read(TRANS_DDI_FUNC_CTL2_A);
            : 	graphics_gtt_write(TRANS_DDI_FUNC_CTL2_A,
            : 		ddi_buf_ctl2 |= TRANS_DDI_FORCE_AUDIO_MUTE);
> use `graphics_gtt_rmw`

Done