[PATCH v2 1/5] drm/tilcdc: Take crtc modeset lock while updating the crtc clock rate
Jyri Sarha
jsarha at ti.com
Tue Sep 6 20:59:21 UTC 2016
Take crtc modeset lock while updating the crtc clock rate. To avoid a
race in tilcdc_crtc_update_clk(), we do not want crtc mode to change
while we update crtc clock.
Signed-off-by: Jyri Sarha <jsarha at ti.com>
---
drivers/gpu/drm/tilcdc/tilcdc_drv.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index f8892e9..b1ac61e 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -184,10 +184,13 @@ static int cpufreq_transition(struct notifier_block *nb,
{
struct tilcdc_drm_private *priv = container_of(nb,
struct tilcdc_drm_private, freq_transition);
+
if (val == CPUFREQ_POSTCHANGE) {
if (priv->lcd_fck_rate != clk_get_rate(priv->clk)) {
+ drm_modeset_lock_crtc(priv->crtc, NULL);
priv->lcd_fck_rate = clk_get_rate(priv->clk);
tilcdc_crtc_update_clk(priv->crtc);
+ drm_modeset_unlock_crtc(priv->crtc);
}
}
--
1.9.1
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