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Date: Sun, 16 Apr 2017 10:04:20 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Chris Wilson <chris@...is-wilson.co.uk>, Tomasz Lis <tomasz.lis@...el.com>, Dave Airlie <airlied@...hat.com>, Daniel Vetter <daniel.vetter@...el.com>, Jani Nikula <jani.nikula@...ux.intel.com>, Sean Paul <seanpaul@...omium.org>, Jani Nikula <jani.nikula@...el.com> Subject: [PATCH 4.10 03/29] drm/i915/fbdev: Stop repeating tile configuration on stagnation 4.10-stable review patch. If anyone has any objections, please let me know. ------------------ From: Chris Wilson <chris@...is-wilson.co.uk> commit b717a0392530ae8da0da041abe5c3a6098b55660 upstream. If we cease making progress in finding matching outputs for a tiled configuration, stop looping over the remaining unconfigured outputs. v2: Use conn_seq (instead of pass) to only apply tile configuration on first pass. Fixes: b0ee9e7fa5b4 ("drm/fb: add support for tiled monitor configurations. (v2)") Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk> Cc: Tomasz Lis <tomasz.lis@...el.com> Cc: Dave Airlie <airlied@...hat.com> Cc: Daniel Vetter <daniel.vetter@...el.com> Cc: Jani Nikula <jani.nikula@...ux.intel.com> Cc: Sean Paul <seanpaul@...omium.org> Reviewed-by: Tomasz Lis <tomasz.lis@...el.com> Link: http://patchwork.freedesktop.org/patch/msgid/20170224114306.4400-1-chris@chris-wilson.co.uk (cherry picked from commit 754a76591b12c88f57ad8b4ca533a5c9566a1922) Signed-off-by: Jani Nikula <jani.nikula@...el.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/gpu/drm/i915/intel_fbdev.c | 10 ++++------ 1 file changed, 4 insertions(+), 6 deletions(-) --- a/drivers/gpu/drm/i915/intel_fbdev.c +++ b/drivers/gpu/drm/i915/intel_fbdev.c @@ -357,14 +357,13 @@ static bool intel_fb_initial_config(stru bool *enabled, int width, int height) { struct drm_i915_private *dev_priv = to_i915(fb_helper->dev); - unsigned long conn_configured, mask; + unsigned long conn_configured, conn_seq, mask; unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG); int i, j; bool *save_enabled; bool fallback = true; int num_connectors_enabled = 0; int num_connectors_detected = 0; - int pass = 0; save_enabled = kcalloc(count, sizeof(bool), GFP_KERNEL); if (!save_enabled) @@ -374,6 +373,7 @@ static bool intel_fb_initial_config(stru mask = BIT(count) - 1; conn_configured = 0; retry: + conn_seq = conn_configured; for (i = 0; i < count; i++) { struct drm_fb_helper_connector *fb_conn; struct drm_connector *connector; @@ -387,7 +387,7 @@ retry: if (conn_configured & BIT(i)) continue; - if (pass == 0 && !connector->has_tile) + if (conn_seq == 0 && !connector->has_tile) continue; if (connector->status == connector_status_connected) @@ -498,10 +498,8 @@ retry: conn_configured |= BIT(i); } - if ((conn_configured & mask) != mask) { - pass++; + if ((conn_configured & mask) != mask && conn_configured != conn_seq) goto retry; - } /* * If the BIOS didn't enable everything it could, fall back to have the
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