From: Chris Wilson chris@chris-wilson.co.uk
If we skipped all the connectors that were not part of a tile, we would leave conn_seq=0 and conn_configured=0, convincing ourselves that we had stagnated in our configuration attempts. Avoid this situation by starting conn_seq=ALL_CONNECTORS, and repeating until we find no more connectors to configure.
Fixes: 754a76591b12 ("drm/i915/fbdev: Stop repeating tile configuration on stagnation") Reported-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com Signed-off-by: Chris Wilson chris@chris-wilson.co.uk Cc: Maarten Lankhorst maarten.lankhorst@linux.intel.com Reviewed-by: Maarten Lankhorst maarten.lankhorst@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20190215123019.32283-1-chris@c... Cc: stable@vger.kernel.org # v3.19+ Signed-off-by: Baolin Wang baolin.wang@linaro.org --- drivers/gpu/drm/i915/intel_fbdev.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_fbdev.c b/drivers/gpu/drm/i915/intel_fbdev.c index da2d309..14eb8a0 100644 --- a/drivers/gpu/drm/i915/intel_fbdev.c +++ b/drivers/gpu/drm/i915/intel_fbdev.c @@ -326,8 +326,8 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper, bool *enabled, int width, int height) { struct drm_i915_private *dev_priv = to_i915(fb_helper->dev); - unsigned long conn_configured, conn_seq, mask; unsigned int count = min(fb_helper->connector_count, BITS_PER_LONG); + unsigned long conn_configured, conn_seq; int i, j; bool *save_enabled; bool fallback = true, ret = true; @@ -345,10 +345,9 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper, drm_modeset_backoff(&ctx);
memcpy(save_enabled, enabled, count); - mask = GENMASK(count - 1, 0); + conn_seq = GENMASK(count - 1, 0); 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; @@ -361,7 +360,8 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper, if (conn_configured & BIT(i)) continue;
- if (conn_seq == 0 && !connector->has_tile) + /* First pass, only consider tiled connectors */ + if (conn_seq == GENMASK(count - 1, 0) && !connector->has_tile) continue;
if (connector->status == connector_status_connected) @@ -465,8 +465,10 @@ static bool intel_fb_initial_config(struct drm_fb_helper *fb_helper, conn_configured |= BIT(i); }
- if ((conn_configured & mask) != mask && conn_configured != conn_seq) + if (conn_configured != conn_seq) { /* repeat until no more are found */ + conn_seq = conn_configured; goto retry; + }
/* * If the BIOS didn't enable everything it could, fall back to have the