pwm: mtk-disp: Propagate errors in .get_state() to the caller

.get_state() can return an error indication. Make use of it to propagate
failing hardware accesses.

Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Acked-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Uwe Kleine-König <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>

Author: Uwe Kleine-König

drivers/pwm/pwm-mtk-disp.c

@@ -184,14 +184,14 @@ static int mtk_disp_pwm_get_state(struct pwm_chip *chip,
 	err = clk_prepare_enable(mdp->clk_main);
 	if (err < 0) {
 		dev_err(chip->dev, "Can't enable mdp->clk_main: %pe\n", ERR_PTR(err));
-		return 0;
+		return err;
 	}
 
 	err = clk_prepare_enable(mdp->clk_mm);
 	if (err < 0) {
 		dev_err(chip->dev, "Can't enable mdp->clk_mm: %pe\n", ERR_PTR(err));
 		clk_disable_unprepare(mdp->clk_main);
-		return 0;
+		return err;
 	}
 
 	rate = clk_get_rate(mdp->clk_main);