[PATCH v2 2/3] phy: rockchip: samsung-hdptx: Handle PHY config after module reload

[Cristian Ciocaltea]

The pll_config_dirty mechanism introduced in commit aec3e4ce25da ("phy:
rockchip: samsung-hdptx: Handle uncommitted PHY config changes")
invalidates the clock rate in determine_rate() by resetting req->rate to
zero, ensuring CCF will invoke set_rate() to program pending PLL
configuration changes into hardware.

However, after a module reload cycle the PHY PLL clock gets
re-registered with CCF, which causes the framework's cached rate to also
be zero.  Setting req->rate to zero then has no effect, since CCF sees
no difference between the requested and current rates and skips calling
set_rate(), leaving the PLL unconfigured.

Address this by first computing the actual target rate from the HDMI
link configuration, and only then invalidating it when it matches the
CCF cached rate.

Fixes: aec3e4ce25da ("phy: rockchip: samsung-hdptx: Handle uncommitted PHY config changes")
Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@xxxxxxxxxxxxx>
---
 drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
index 24ed0d7eb6f8..b03042ec9a84 100644
--- a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
+++ b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c
@@ -2346,14 +2346,16 @@ static int rk_hdptx_phy_clk_determine_rate(struct clk_hw *hw,
 	 * to ensure rk_hdptx_phy_clk_set_rate() will be always invoked.
 	 * Otherwise, restrict the rate according to the PHY link setup.
 	 */
-	if (hdptx->pll_config_dirty)
-		req->rate = 0;
-	else if (hdptx->hdmi_cfg.mode == PHY_HDMI_MODE_FRL)
+
+	if (hdptx->hdmi_cfg.mode == PHY_HDMI_MODE_FRL)
 		req->rate = hdptx->hdmi_cfg.rate;
 	else
 		req->rate = DIV_ROUND_CLOSEST_ULL(hdptx->hdmi_cfg.rate * 8,
 						  hdptx->hdmi_cfg.bpc);
 
+	if (hdptx->pll_config_dirty && req->rate == clk_hw_get_rate(hw))
+		req->rate = 0;
+
 	return 0;
 }
 

-- 
2.55.0