linux-kernel - Re: [PATCHv2] drm: fb_helper: prefer to use mode, which is not DRM_MODE_TYPE

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Date:	Mon, 20 Apr 2015 12:44:50 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Radek Dostál <rd@...ekdostal.com>
Cc:	airlied@...ux.ie, dri-devel@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2] drm: fb_helper: prefer to use mode, which is not
 DRM_MODE_TYPE_USERDEF

On Mon, Apr 20, 2015 at 01:20:05PM +0200, Radek Dostál wrote:
> Hi Chris,
> 
> On 04/20/2015 01:00 PM, Chris Wilson wrote:
> > Can you do a WARN_ON(list_empty(&connector->modes)) here to see at what
> > point we set up the invalid GTF mode?
> 
> sure please see attached patch adding WARN_ON and corresponding output
> of dmesg. As mentioned in the original commit, the mode is indeed added
> in drm_helper_probe_add_cmdline_mode.

Ah, maybe this on top of the previous try:

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 88f5a74..5d22ca0 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -87,7 +87,7 @@ static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
                return 0;
 
        /* Only add a GTF mode if we find no matching probed modes */
-       list_for_each_entry(mode, &connector->modes, head) {
+       list_for_each_entry(mode, &connector->probed_modes, head) {
                if (mode->hdisplay != cmdline_mode->xres ||
                    mode->vdisplay != cmdline_mode->yres)
                        continue;
@@ -211,7 +211,8 @@ static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connect
                mode_flags |= DRM_MODE_FLAG_3D_MASK;
 
        list_for_each_entry(mode, &connector->modes, head) {
-               mode->status = drm_mode_validate_basic(mode);
+               if (mode->status == MODE_OK)
+                       mode->status = drm_mode_validate_basic(mode);
 
                if (mode->status == MODE_OK)
                        mode->status = drm_mode_validate_size(mode, maxX, maxY


-- 
Chris Wilson, Intel Open Source Technology Centre
--
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