linux-kernel - Re: [PATCH 08/10] drm/mxsfb: Update mxsfb to support LCD reset

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Date:   Thu, 10 Jan 2019 19:19:11 -0200
From:   Fabio Estevam <festevam@...il.com>
To:     Robert Chiras <robert.chiras@....com>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Marek Vasut <marex@...x.de>, Anson Huang <anson.huang@....com>,
        David Airlie <airlied@...ux.ie>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH 08/10] drm/mxsfb: Update mxsfb to support LCD reset

Hi Robert,

On Thu, Jan 10, 2019 at 6:34 AM Robert Chiras <robert.chiras@....com> wrote:
>
> The eLCDIF controller has control pin for the external LCD reset pin.
> Add support for it and assert this pin in enable and de-assert it in
> disable.
> Also, correct the pm_runtime_enable call, since it was made too early in
> the probe, causing issues to DRM enable routines.

The pm_runtime change should be on a different patch.

> Signed-off-by: Robert Chiras <robert.chiras@....com>
> ---
>  drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 12 ++++++++++--
>  drivers/gpu/drm/mxsfb/mxsfb_drv.c  | 20 ++++++++------------
>  drivers/gpu/drm/mxsfb/mxsfb_regs.h |  1 +
>  3 files changed, 19 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
> index b62b607..8d1b6a6 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_crtc.c
> @@ -230,9 +230,12 @@ static void mxsfb_enable_controller(struct mxsfb_drm_private *mxsfb)
>                 clk_prepare_enable(mxsfb->clk_disp_axi);
>         clk_prepare_enable(mxsfb->clk);
>
> -       if (mxsfb->devdata->ipversion >= 4)
> +       if (mxsfb->devdata->ipversion >= 4) {
>                 writel(CTRL2_OUTSTANDING_REQS(REQ_16),
>                         mxsfb->base + LCDC_V4_CTRL2 + REG_SET);
> +               /* Assert LCD Reset bit */
> +               writel(CTRL2_LCD_RESET, mxsfb->base + LCDC_V4_CTRL2 + REG_SET);
> +       }
>
>         /* If it was disabled, re-enable the mode again */
>         writel(CTRL_DOTCLK_MODE, mxsfb->base + LCDC_CTRL + REG_SET);
> @@ -250,9 +253,12 @@ static void mxsfb_disable_controller(struct mxsfb_drm_private *mxsfb)
>  {
>         u32 reg;
>
> -       if (mxsfb->devdata->ipversion >= 4)
> +       if (mxsfb->devdata->ipversion >= 4) {
>                 writel(CTRL2_OUTSTANDING_REQS(0x7),
>                         mxsfb->base + LCDC_V4_CTRL2 + REG_CLR);
> +               /* De-assert LCD Reset bit */
> +               writel(CTRL2_LCD_RESET, mxsfb->base + LCDC_V4_CTRL2 + REG_CLR);
> +       }
>
>         writel(CTRL_RUN, mxsfb->base + LCDC_CTRL + REG_CLR);
>
> @@ -346,6 +352,8 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb)
>                 return;
>
>         clk_set_rate(mxsfb->clk, m->crtc_clock * 1000);
> +       DRM_DEV_DEBUG_DRIVER(drm->dev, "Pixel clock: %dkHz (actual: %dkHz)\n",
> +               m->crtc_clock, (int)(clk_get_rate(mxsfb->clk) / 1000));

This unrelated change should also be in a different patch.
>
>         DRM_DEV_DEBUG_DRIVER(drm->dev,
>                 "Connector bus_flags: 0x%08X\n", bus_flags);
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> index f528a37..135b8e1 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
> @@ -287,7 +287,7 @@ static int mxsfb_load(struct drm_device *drm, unsigned long flags)
>         if (IS_ERR(mxsfb->base))
>                 return PTR_ERR(mxsfb->base);
>
> -       mxsfb->clk = devm_clk_get(drm->dev, NULL);
> +       mxsfb->clk = devm_clk_get(drm->dev, "pix");

This breaks mx23 and mx28 as there is no "pix" clock defined in their
dtsi files.