diff options
Diffstat (limited to 'drivers/gpu/drm/tidss/tidss_dispc.c')
| -rw-r--r-- | drivers/gpu/drm/tidss/tidss_dispc.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c b/drivers/gpu/drm/tidss/tidss_dispc.c index 5571ddfe3c44..4c95f563a530 100644 --- a/drivers/gpu/drm/tidss/tidss_dispc.c +++ b/drivers/gpu/drm/tidss/tidss_dispc.c @@ -1346,6 +1346,25 @@ int dispc_vp_set_clk_rate(struct dispc_device *dispc, u32 hw_videoport, new_rate = clk_get_rate(dispc->vp_clk[hw_videoport]); + /* + * XXX: There seems to be a bug somewhere, causing the clock to be 0 + * in some cases (when changing the video mode). Retrying the + * clk_set_rate "fixes" it. + */ + if (new_rate == 0) { + dev_warn(dispc->dev, "vp%d: applying clk_set_rate workaround\n", + hw_videoport); + + r = clk_set_rate(dispc->vp_clk[hw_videoport], rate); + if (r) { + dev_err(dispc->dev, "vp%d: failed to set clk rate to %lu\n", + hw_videoport, rate); + return r; + } + + new_rate = clk_get_rate(dispc->vp_clk[hw_videoport]); + } + if (dispc_pclk_diff(rate, new_rate) > 5) dev_warn(dispc->dev, "vp%d: Clock rate %lu differs over 5%% from requested %lu\n", |