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Message-ID: <CAOw6vb+peajznT3BkAZSG7f_7NRB08rTA8Vh_AufPSmwYjT0EQ@mail.gmail.com>
Date: Tue, 18 Oct 2016 11:52:16 -0400
From: Sean Paul <seanpaul@...omium.org>
To: Zain Wang <wzz@...k-chips.com>, Archit <architt@...eaurora.org>
Cc: Daniel Vetter <daniel.vetter@...ll.ch>,
Inki Dae <inki.dae@...sung.com>,
David Airlie <airlied@...ux.ie>,
Tomeu Vizoso <tomeu.vizoso@...labora.com>,
Mika Kahola <mika.kahola@...el.com>,
Stéphane Marchesin <marcheu@...omium.org>,
Tomasz Figa <tfiga@...omium.org>,
Doug Anderson <dianders@...omium.org>,
Thierry Reding <treding@...dia.com>,
Krzysztof Kozlowski <k.kozlowski@...sung.com>,
Heiko Stuebner <heiko@...ech.de>,
Jingoo Han <jingoohan1@...il.com>,
Javier Martinez Canillas <javier@....samsung.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
dri-devel <dri-devel@...ts.freedesktop.org>,
linux-samsung-soc <linux-samsung-soc@...r.kernel.org>,
linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH v3 1/6] drm/bridge: analogix_dp: set psr
activate/deactivate when enable/disable bridge
On Tue, Oct 18, 2016 at 2:14 AM, Zain Wang <wzz@...k-chips.com> wrote:
> From: zain wang <wzz@...k-chips.com>
>
> There's a race between when bridge_disable and when vop_crtc_disable are called.
> If the flush timer triggers a new psr work between these, we will operate eDP
> without power shutdowned by bridge_disable.
> In this case, moving activate/deactivate to enable/disable bridge to avoid it.
>
Reviewed-by: Sean Paul <seanpaul@...omium.org>
> Signed-off-by: zain wang <wzz@...k-chips.com>
> ---
>
> Changes in v3:
> - remove changes before.
> - move psr activat/deactivate to enable/disable bridge.
>
> Changes in v2:
> - add spin_lock to protect dpms_mode
>
>
> drivers/gpu/drm/rockchip/analogix_dp-rockchip.c | 4 ++--
> drivers/gpu/drm/rockchip/rockchip_drm_psr.c | 30 ++++++++++++++++++++-----
> drivers/gpu/drm/rockchip/rockchip_drm_psr.h | 4 ++--
> drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 4 ----
> 4 files changed, 28 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> index 8548e82..e5471e7 100644
> --- a/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> +++ b/drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
> @@ -159,7 +159,7 @@ static int rockchip_dp_poweron(struct analogix_dp_plat_data *plat_data)
> return ret;
> }
>
> - return 0;
> + return rockchip_drm_psr_activate(&dp->encoder);
> }
>
> static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
> @@ -168,7 +168,7 @@ static int rockchip_dp_powerdown(struct analogix_dp_plat_data *plat_data)
>
> clk_disable_unprepare(dp->pclk);
>
> - return 0;
> + return rockchip_drm_psr_deactivate(&dp->encoder);
> }
>
> static int rockchip_dp_get_modes(struct analogix_dp_plat_data *plat_data,
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
> index a553e18..4c379e9 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.c
> @@ -57,6 +57,24 @@ out:
> return psr;
> }
>
> +static struct psr_drv *find_psr_by_encoder(struct drm_encoder *encoder)
> +{
> + struct rockchip_drm_private *drm_drv = encoder->dev->dev_private;
> + struct psr_drv *psr;
> + unsigned long flags;
> +
> + spin_lock_irqsave(&drm_drv->psr_list_lock, flags);
> + list_for_each_entry(psr, &drm_drv->psr_list, list) {
> + if (psr->encoder == encoder)
> + goto out;
> + }
> + psr = ERR_PTR(-ENODEV);
> +
> +out:
> + spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);
> + return psr;
> +}
> +
> static void psr_set_state_locked(struct psr_drv *psr, enum psr_state state)
> {
> /*
> @@ -115,14 +133,14 @@ static void psr_flush_handler(unsigned long data)
>
> /**
> * rockchip_drm_psr_activate - activate PSR on the given pipe
> - * @crtc: CRTC to obtain the PSR encoder
> + * @encoder: encoder to obtain the PSR encoder
> *
> * Returns:
> * Zero on success, negative errno on failure.
> */
> -int rockchip_drm_psr_activate(struct drm_crtc *crtc)
> +int rockchip_drm_psr_activate(struct drm_encoder *encoder)
> {
> - struct psr_drv *psr = find_psr_by_crtc(crtc);
> + struct psr_drv *psr = find_psr_by_encoder(encoder);
> unsigned long flags;
>
> if (IS_ERR(psr))
> @@ -138,14 +156,14 @@ EXPORT_SYMBOL(rockchip_drm_psr_activate);
>
> /**
> * rockchip_drm_psr_deactivate - deactivate PSR on the given pipe
> - * @crtc: CRTC to obtain the PSR encoder
> + * @encoder: encoder to obtain the PSR encoder
> *
> * Returns:
> * Zero on success, negative errno on failure.
> */
> -int rockchip_drm_psr_deactivate(struct drm_crtc *crtc)
> +int rockchip_drm_psr_deactivate(struct drm_encoder *encoder)
> {
> - struct psr_drv *psr = find_psr_by_crtc(crtc);
> + struct psr_drv *psr = find_psr_by_encoder(encoder);
> unsigned long flags;
>
> if (IS_ERR(psr))
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_psr.h b/drivers/gpu/drm/rockchip/rockchip_drm_psr.h
> index b420cf1..b1ea015 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_psr.h
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_psr.h
> @@ -18,8 +18,8 @@
> void rockchip_drm_psr_flush_all(struct drm_device *dev);
> int rockchip_drm_psr_flush(struct drm_crtc *crtc);
>
> -int rockchip_drm_psr_activate(struct drm_crtc *crtc);
> -int rockchip_drm_psr_deactivate(struct drm_crtc *crtc);
> +int rockchip_drm_psr_activate(struct drm_encoder *encoder);
> +int rockchip_drm_psr_deactivate(struct drm_encoder *encoder);
>
> int rockchip_drm_psr_register(struct drm_encoder *encoder,
> void (*psr_set)(struct drm_encoder *, bool enable));
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index c7eba30..1740a0b 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -566,8 +566,6 @@ static void vop_crtc_disable(struct drm_crtc *crtc)
>
> WARN_ON(vop->event);
>
> - rockchip_drm_psr_deactivate(&vop->crtc);
> -
> /*
> * We need to make sure that all windows are disabled before we
> * disable that crtc. Otherwise we might try to scan from a destroyed
> @@ -975,8 +973,6 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
> clk_set_rate(vop->dclk, adjusted_mode->clock * 1000);
>
> VOP_CTRL_SET(vop, standby, 0);
> -
> - rockchip_drm_psr_activate(&vop->crtc);
> }
>
> static bool vop_fs_irq_is_pending(struct vop *vop)
> --
> 1.9.1
>
>
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