diff mbox series

[v5,14/24] drm/msm/dsi/phy: Toggle back buffer resync after preparing PLL

Message ID 20250430-b4-sm8750-display-v5-14-8cab30c3e4df@linaro.org
State New
Headers show
Series [v5,01/24] dt-bindings: display/msm: dsi-phy-7nm: Add SM8750 | expand

Commit Message

Krzysztof Kozlowski April 30, 2025, 1 p.m. UTC 
According to Hardware Programming Guide for DSI PHY, the retime buffer
resync should be done after PLL clock users (byte_clk and intf_byte_clk)
are enabled.  Downstream also does it as part of configuring the PLL.

Driver was only turning of the resync FIFO buffer, but never bringing it
on again.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

---

Changes in v5:
1. New patch
---
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
index a92decbee5b5433853ed973747f7705d9079068d..ca1a120f630a3650bf6d9f9d426cccea88c22e7f 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
@@ -467,6 +467,10 @@  static int dsi_pll_7nm_vco_prepare(struct clk_hw *hw)
 	if (pll_7nm->slave)
 		dsi_pll_enable_global_clk(pll_7nm->slave);
 
+	writel(0x1, pll_7nm->phy->base + REG_DSI_7nm_PHY_CMN_RBUF_CTRL);
+	if (pll_7nm->slave)
+		writel(0x1, pll_7nm->slave->phy->base + REG_DSI_7nm_PHY_CMN_RBUF_CTRL);
+
 error:
 	return rc;
 }