linux-kernel - Re: [PATCH] drm/i915/lspcon: Limits to 8 bpc for RGB/YCbCr444

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Date:   Mon, 31 Aug 2020 22:48:20 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Kai Heng Feng <kai.heng.feng@...onical.com>
Cc:     Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Uma Shankar <uma.shankar@...el.com>,
        Lucas De Marchi <lucas.demarchi@...el.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Gwan-gyeong Mun <gwan-gyeong.mun@...el.com>,
        intel-gfx@...ts.freedesktop.org,
        "open list:DRM DRIVERS" <dri-devel@...ts.freedesktop.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/i915/lspcon: Limits to 8 bpc for RGB/YCbCr444

On Thu, Aug 27, 2020 at 01:04:54PM +0800, Kai Heng Feng wrote:
> Hi Ville,
> 
> > On Aug 27, 2020, at 12:24 AM, Ville Syrjälä <ville.syrjala@...ux.intel.com> wrote:
> > 
> > On Wed, Aug 26, 2020 at 01:21:15PM +0800, Kai-Heng Feng wrote:
> >> LSPCON only supports 8 bpc for RGB/YCbCr444.
> >> 
> >> Set the correct bpp otherwise it renders blank screen.
> > 
> > Hmm. Does 
> > git://github.com/vsyrjala/linux.git dp_downstream_ports_5
> > work?
> > 
> > Actually better make that dp_downstream_ports_5^^^^^^^^^^^ aka.
> > 54d846ce62a2 ("drm/i915: Do YCbCr 444->420 conversion via DP protocol
> > converters") to avoid the experiments and hacks I have sitting on top.
> 
> Can you please rebase it to mainline master or drm-tip?

git://github.com/vsyrjala/linux.git dp_downstream_ports_6

I threw out the hacks/experimental stuff.

> 
> I am getting errors on the branch:
> 
>   DESCEND  objtool
>   CALL    scripts/atomic/check-atomics.sh
>   CALL    scripts/checksyscalls.sh
>   CHK     include/generated/compile.h
>   Building modules, stage 2.
>   MODPOST 166 modules
>   LD      arch/x86/boot/compressed/vmlinux
> ld: arch/x86/boot/compressed/pgtable_64.o:(.bss+0x0): multiple definition of `__force_order'; arch/x86/boot/compressed/kaslr_64.o:(.bss+0x0): first defined here
> ld: arch/x86/boot/compressed/head_64.o: warning: relocation in read-only section `.head.text'
> ld: warning: creating DT_TEXTREL in a PIE
> make[2]: *** [arch/x86/boot/compressed/Makefile:119: arch/x86/boot/compressed/vmlinux] Error 1
> make[1]: *** [arch/x86/boot/Makefile:113: arch/x86/boot/compressed/vmlinux] Error 2
> make: *** [arch/x86/Makefile:284: bzImage] Error 2
> make: *** Waiting for unfinished jobs....
> 
> Kai-Heng
> 
> > 
> >> 
> >> Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2195
> >> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> >> ---
> >> drivers/gpu/drm/i915/display/intel_lspcon.c | 3 ++-
> >> 1 file changed, 2 insertions(+), 1 deletion(-)
> >> 
> >> diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c b/drivers/gpu/drm/i915/display/intel_lspcon.c
> >> index b781bf469644..c7a44fcaade8 100644
> >> --- a/drivers/gpu/drm/i915/display/intel_lspcon.c
> >> +++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
> >> @@ -196,7 +196,8 @@ void lspcon_ycbcr420_config(struct drm_connector *connector,
> >> 		crtc_state->port_clock /= 2;
> >> 		crtc_state->output_format = INTEL_OUTPUT_FORMAT_YCBCR444;
> >> 		crtc_state->lspcon_downsampling = true;
> >> -	}
> >> +	} else
> >> +		crtc_state->pipe_bpp = 24;
> >> }
> >> 
> >> static bool lspcon_probe(struct intel_lspcon *lspcon)
> >> -- 
> >> 2.17.1
> > 
> > -- 
> > Ville Syrjälä
> > Intel

-- 
Ville Syrjälä
Intel