linux-kernel - Re: [PATCH 13/15] drm/gma500: cleanup: drm_modeset_lock_all() --> DRM_MODESET_LOCK_ALL

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Message-ID: <20210917154908.GN2515@art_vandelay>
Date:   Fri, 17 Sep 2021 11:49:08 -0400
From:   Sean Paul <sean@...rly.run>
To:     Fernando Ramos <greenfoo@....eu>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        sean@...rly.run, linux-doc@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-renesas-soc@...r.kernel.org,
        linux-tegra@...r.kernel.org
Subject: Re: [PATCH 13/15] drm/gma500: cleanup: drm_modeset_lock_all() -->
 DRM_MODESET_LOCK_ALL_BEGIN()

On Thu, Sep 16, 2021 at 11:15:50PM +0200, Fernando Ramos wrote:
> As requested in Documentation/gpu/todo.rst, replace driver calls to
> drm_modeset_lock_all() with DRM_MODESET_LOCK_ALL_BEGIN() and
> DRM_MODESET_LOCK_ALL_END()
> 
> Signed-off-by: Fernando Ramos <greenfoo@....eu>
> ---
>  drivers/gpu/drm/gma500/psb_device.c | 14 ++++++++++----
>  1 file changed, 10 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/gma500/psb_device.c b/drivers/gpu/drm/gma500/psb_device.c
> index 951725a0f7a3..4e27f65a1f16 100644
> --- a/drivers/gpu/drm/gma500/psb_device.c
> +++ b/drivers/gpu/drm/gma500/psb_device.c
> @@ -8,6 +8,7 @@
>  #include <linux/backlight.h>
>  
>  #include <drm/drm.h>
> +#include <drm/drm_drv.h>
>  
>  #include "gma_device.h"
>  #include "intel_bios.h"
> @@ -169,8 +170,10 @@ static int psb_save_display_registers(struct drm_device *dev)
>  {
>  	struct drm_psb_private *dev_priv = dev->dev_private;
>  	struct drm_crtc *crtc;
> +	struct drm_modeset_acquire_ctx ctx;
>  	struct gma_connector *connector;
>  	struct psb_state *regs = &dev_priv->regs.psb;
> +	int ret;
>  
>  	/* Display arbitration control + watermarks */
>  	regs->saveDSPARB = PSB_RVDC32(DSPARB);
> @@ -183,7 +186,7 @@ static int psb_save_display_registers(struct drm_device *dev)
>  	regs->saveCHICKENBIT = PSB_RVDC32(DSPCHICKENBIT);
>  
>  	/* Save crtc and output state */
> -	drm_modeset_lock_all(dev);
> +	DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
>  	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
>  		if (drm_helper_crtc_in_use(crtc))
>  			dev_priv->ops->save_crtc(crtc);
> @@ -193,7 +196,8 @@ static int psb_save_display_registers(struct drm_device *dev)
>  		if (connector->save)
>  			connector->save(&connector->base);
>  
> -	drm_modeset_unlock_all(dev);
> +	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
> +
>  	return 0;

Return ret here please

>  }
>  
> @@ -207,8 +211,10 @@ static int psb_restore_display_registers(struct drm_device *dev)
>  {
>  	struct drm_psb_private *dev_priv = dev->dev_private;
>  	struct drm_crtc *crtc;
> +	struct drm_modeset_acquire_ctx ctx;
>  	struct gma_connector *connector;
>  	struct psb_state *regs = &dev_priv->regs.psb;
> +	int ret;
>  
>  	/* Display arbitration + watermarks */
>  	PSB_WVDC32(regs->saveDSPARB, DSPARB);
> @@ -223,7 +229,7 @@ static int psb_restore_display_registers(struct drm_device *dev)
>  	/*make sure VGA plane is off. it initializes to on after reset!*/
>  	PSB_WVDC32(0x80000000, VGACNTRL);
>  
> -	drm_modeset_lock_all(dev);
> +	DRM_MODESET_LOCK_ALL_BEGIN(dev, ctx, 0, ret);
>  	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
>  		if (drm_helper_crtc_in_use(crtc))
>  			dev_priv->ops->restore_crtc(crtc);
> @@ -232,7 +238,7 @@ static int psb_restore_display_registers(struct drm_device *dev)
>  		if (connector->restore)
>  			connector->restore(&connector->base);
>  
> -	drm_modeset_unlock_all(dev);
> +	DRM_MODESET_LOCK_ALL_END(dev, ctx, ret);
>  	return 0;

Here too

>  }
>  
> -- 
> 2.33.0
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS