On Tue, 13 Dec 2022 at 20:33, Robert Foss robert.foss@linaro.org wrote:

This fixes PLL being unable to lock, and is derived from an equivalent downstream commit.

Available LT9611 documentation does not list this register, neither does LT9611UXC (which is a different chip).

This commit has been confirmed to fix HDMI output on DragonBoard 845c.

Cc: stable@vger.kernel.org [v5.10+] Reviewed-by: Amit Pundir amit.pundir@linaro.org

Suggested-by: Amit Pundir amit.pundir@linaro.org Signed-off-by: Robert Foss robert.foss@linaro.org

---

drivers/gpu/drm/bridge/lontium-lt9611.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/bridge/lontium-lt9611.c b/drivers/gpu/drm/bridge/lontium-lt9611.c index ffcdc8dba3798..3ce4e495aee50 100644 --- a/drivers/gpu/drm/bridge/lontium-lt9611.c +++ b/drivers/gpu/drm/bridge/lontium-lt9611.c @@ -259,6 +259,7 @@ static int lt9611_pll_setup(struct lt9611 *lt9611, const struct drm_display_mode { 0x8126, 0x55 }, { 0x8127, 0x66 }, { 0x8128, 0x88 },

•           { 0x812a, 0x20 },
    };
  
    regmap_multi_reg_write(lt9611->regmap, reg_cfg, ARRAY_SIZE(reg_cfg));
  

-- 2.34.1