linux-kernel - Re: [PATCH 2/3] pmdomain: imx8mp-blk-ctrl: imx8mp

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Date: Thu, 1 Feb 2024 18:17:43 -0600
From: Adam Ford <aford173@...il.com>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: linux-pm@...r.kernel.org, Sandor Yu <Sandor.yu@....com>, 
	Jacky Bai <ping.bai@....com>, Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, 
	Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, 
	NXP Linux Team <linux-imx@....com>, Lucas Stach <l.stach@...gutronix.de>, devicetree@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] pmdomain: imx8mp-blk-ctrl: imx8mp_blk: Add fdcc clock
 to hdmimix domain

On Thu, Feb 1, 2024 at 4:33 PM Ulf Hansson <ulf.hansson@...aro.org> wrote:
>
> On Sat, 6 Jan 2024 at 23:40, Adam Ford <aford173@...il.com> wrote:
> >
> > According to i.MX8MP RM and HDMI ADD, the fdcc clock is part of
> > hdmi rx verification IP that should not enable for HDMI TX.
> > But actually if the clock is disabled before HDMI/LCDIF probe,
> > LCDIF will not get pixel clock from HDMI PHY and print the error
> > logs:
> >
> > [CRTC:39:crtc-2] vblank wait timed out
> > WARNING: CPU: 2 PID: 9 at drivers/gpu/drm/drm_atomic_helper.c:1634 drm_atomic_helper_wait_for_vblanks.part.0+0x23c/0x260
> >
> > Add fdcc clock to LCDIF and HDMI TX power domains to fix the issue.
> >
> > Signed-off-by: Sandor Yu <Sandor.yu@....com>
> > Reviewed-by: Jacky Bai <ping.bai@....com>
> > Signed-off-by: Adam Ford <aford173@...il.com>
>
> Just to let you know, this looks good to me and it seems like the NXP
> people like this too. What I am waiting for is an ack on the DT patch,
> then I am ready to queue this up.

What about the bindings?  I'm assuming that Shawn would take the DT
through his IMX tree, but I am not sure if I need to resubmit the
bindings with a different commit message.

adam
>
> Kind regards
> Uffe
>
> > ---
> > The original work was from Sandor on the NXP Down-stream kernel
> >
> > diff --git a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c
> > index e3203eb6a022..a56f7f92d091 100644
> > --- a/drivers/pmdomain/imx/imx8mp-blk-ctrl.c
> > +++ b/drivers/pmdomain/imx/imx8mp-blk-ctrl.c
> > @@ -55,7 +55,7 @@ struct imx8mp_blk_ctrl_domain_data {
> >         const char *gpc_name;
> >  };
> >
> > -#define DOMAIN_MAX_CLKS 2
> > +#define DOMAIN_MAX_CLKS 3
> >  #define DOMAIN_MAX_PATHS 3
> >
> >  struct imx8mp_blk_ctrl_domain {
> > @@ -457,8 +457,8 @@ static const struct imx8mp_blk_ctrl_domain_data imx8mp_hdmi_domain_data[] = {
> >         },
> >         [IMX8MP_HDMIBLK_PD_LCDIF] = {
> >                 .name = "hdmiblk-lcdif",
> > -               .clk_names = (const char *[]){ "axi", "apb" },
> > -               .num_clks = 2,
> > +               .clk_names = (const char *[]){ "axi", "apb", "fdcc" },
> > +               .num_clks = 3,
> >                 .gpc_name = "lcdif",
> >                 .path_names = (const char *[]){"lcdif-hdmi"},
> >                 .num_paths = 1,
> > @@ -483,8 +483,8 @@ static const struct imx8mp_blk_ctrl_domain_data imx8mp_hdmi_domain_data[] = {
> >         },
> >         [IMX8MP_HDMIBLK_PD_HDMI_TX] = {
> >                 .name = "hdmiblk-hdmi-tx",
> > -               .clk_names = (const char *[]){ "apb", "ref_266m" },
> > -               .num_clks = 2,
> > +               .clk_names = (const char *[]){ "apb", "ref_266m", "fdcc" },
> > +               .num_clks = 3,
> >                 .gpc_name = "hdmi-tx",
> >         },
> >         [IMX8MP_HDMIBLK_PD_HDMI_TX_PHY] = {
> > --
> > 2.43.0
> >