linux-kernel - [PATCH v4 4/4] drm/msm/dsi/phy: Define PHY_CMN_CLK

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Message-Id: <20250217-drm-msm-phy-pll-cfg-reg-v4-4-106b0d1df51e@linaro.org>
Date: Mon, 17 Feb 2025 12:53:17 +0100
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Rob Clark <robdclark@...il.com>, 
 Abhinav Kumar <quic_abhinavk@...cinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Sean Paul <sean@...rly.run>, 
 Marijn Suijten <marijn.suijten@...ainline.org>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Jonathan Marek <jonathan@...ek.ca>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org, 
 freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org, 
 Rob Clark <robdclark@...omium.org>, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v4 4/4] drm/msm/dsi/phy: Define PHY_CMN_CLK_CFG[01]
 bitfields and simplify saving

Add bitfields for PHY_CMN_CLK_CFG0 and PHY_CMN_CLK_CFG1 registers to
avoid hard-coding bit masks and shifts and make the code a bit more
readable.  While touching the lines in dsi_7nm_pll_save_state()
resulting cached->pix_clk_div assignment would be too big, so just
combine pix_clk_div and bit_clk_div into one cached state to make
everything simpler.

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

---

Changes in v4:
1. Add mising bitfield.h include
2. One more FIELD_GET and DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL (Dmitry)

Changes in v3:
1. Use FIELD_GET
2. Keep separate bit_clk_div and pix_clk_div
3. Rebase (some things moved to previous patches)

Changes in v2:
1. New patch
---
 drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c             | 13 ++++++++-----
 drivers/gpu/drm/msm/registers/display/dsi_phy_7nm.xml |  1 +
 2 files changed, 9 insertions(+), 5 deletions(-)

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 798168180c1ab6c96ec2384f854302720cb27932..cf63b4c5c3c0c39f0031dbe948b1694765f01af8 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_7nm.c
@@ -3,6 +3,7 @@
  * Copyright (c) 2018, The Linux Foundation
  */
 
+#include <linux/bitfield.h>
 #include <linux/clk.h>
 #include <linux/clk-provider.h>
 #include <linux/iopoll.h>
@@ -572,11 +573,11 @@ static void dsi_7nm_pll_save_state(struct msm_dsi_phy *phy)
 	cached->pll_out_div &= 0x3;
 
 	cmn_clk_cfg0 = readl(phy_base + REG_DSI_7nm_PHY_CMN_CLK_CFG0);
-	cached->bit_clk_div = cmn_clk_cfg0 & 0xf;
-	cached->pix_clk_div = (cmn_clk_cfg0 & 0xf0) >> 4;
+	cached->bit_clk_div = FIELD_GET(DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_3_0__MASK, cmn_clk_cfg0);
+	cached->pix_clk_div = FIELD_GET(DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_7_4__MASK, cmn_clk_cfg0);
 
 	cmn_clk_cfg1 = readl(phy_base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
-	cached->pll_mux = cmn_clk_cfg1 & 0x3;
+	cached->pll_mux = FIELD_GET(DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL__MASK, cmn_clk_cfg1);
 
 	DBG("DSI PLL%d outdiv %x bit_clk_div %x pix_clk_div %x pll_mux %x",
 	    pll_7nm->phy->id, cached->pll_out_div, cached->bit_clk_div,
@@ -598,7 +599,8 @@ static int dsi_7nm_pll_restore_state(struct msm_dsi_phy *phy)
 	dsi_pll_cmn_clk_cfg0_write(pll_7nm,
 				   DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_3_0(cached->bit_clk_div) |
 				   DSI_7nm_PHY_CMN_CLK_CFG0_DIV_CTRL_7_4(cached->pix_clk_div));
-	dsi_pll_cmn_clk_cfg1_update(pll_7nm, 0x3, cached->pll_mux);
+	dsi_pll_cmn_clk_cfg1_update(pll_7nm, DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL__MASK,
+				    cached->pll_mux);
 
 	ret = dsi_pll_7nm_vco_set_rate(phy->vco_hw,
 			pll_7nm->vco_current_rate,
@@ -739,7 +741,8 @@ static int pll_7nm_register(struct dsi_pll_7nm *pll_7nm, struct clk_hw **provide
 		u32 data;
 
 		data = readl(pll_7nm->phy->base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
-		writel(data | 3, pll_7nm->phy->base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
+		writel(data | DSI_7nm_PHY_CMN_CLK_CFG1_DSICLK_SEL(3),
+		       pll_7nm->phy->base + REG_DSI_7nm_PHY_CMN_CLK_CFG1);
 
 		phy_pll_out_dsi_parent = pll_post_out_div;
 	} else {
diff --git a/drivers/gpu/drm/msm/registers/display/dsi_phy_7nm.xml b/drivers/gpu/drm/msm/registers/display/dsi_phy_7nm.xml
index 35f7f40e405b7dd9687725eae754522a7136725e..d2c8c46bb04159da6e539bfe80a4b5dc9ffdf367 100644
--- a/drivers/gpu/drm/msm/registers/display/dsi_phy_7nm.xml
+++ b/drivers/gpu/drm/msm/registers/display/dsi_phy_7nm.xml
@@ -17,6 +17,7 @@ xsi:schemaLocation="https://gitlab.freedesktop.org/freedreno/ rules-fd.xsd">
 		<bitfield name="CLK_EN" pos="5" type="boolean"/>
 		<bitfield name="CLK_EN_SEL" pos="4" type="boolean"/>
 		<bitfield name="BITCLK_SEL" low="2" high="3" type="uint"/>
+		<bitfield name="DSICLK_SEL" low="0" high="1" type="uint"/>
 	</reg32>
 	<reg32 offset="0x00018" name="GLBL_CTRL"/>
 	<reg32 offset="0x0001c" name="RBUF_CTRL"/>

-- 
2.43.0