Expand HDMI PHY clock driver to support second clock parent.
Signed-off-by: Jernej Skrabec jernej.skrabec@siol.net --- drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h | 4 +- drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c | 3 +- drivers/gpu/drm/sun4i/sun8i_hdmi_phy_clk.c | 90 ++++++++++++++++------ 3 files changed, 73 insertions(+), 24 deletions(-)
diff --git a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h index 46a3aa6a53a9..aadbe0a10b0c 100644 --- a/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h +++ b/drivers/gpu/drm/sun4i/sun8i_dw_hdmi.h @@ -99,6 +99,7 @@ #define SUN8I_HDMI_PHY_PLL_CFG1_LDO1_EN BIT(28) #define SUN8I_HDMI_PHY_PLL_CFG1_HV_IS_33 BIT(27) #define SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_MSK BIT(26) +#define SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_SHIFT 26 #define SUN8I_HDMI_PHY_PLL_CFG1_PLLEN BIT(25) #define SUN8I_HDMI_PHY_PLL_CFG1_LDO_VSET(x) ((x) << 22) #define SUN8I_HDMI_PHY_PLL_CFG1_UNKNOWN(x) ((x) << 20) @@ -190,6 +191,7 @@ void sun8i_hdmi_phy_remove(struct sun8i_dw_hdmi *hdmi); void sun8i_hdmi_phy_init(struct sun8i_hdmi_phy *phy); const struct dw_hdmi_phy_ops *sun8i_hdmi_phy_get_ops(void);
-int sun8i_phy_clk_create(struct sun8i_hdmi_phy *phy, struct device *dev); +int sun8i_phy_clk_create(struct sun8i_hdmi_phy *phy, struct device *dev, + bool second_parent);
#endif /* _SUN8I_DW_HDMI_H_ */ diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c index f50072ae054a..e1b7196d4587 100644 --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy.c @@ -491,7 +491,8 @@ int sun8i_hdmi_phy_probe(struct sun8i_dw_hdmi *hdmi, struct device_node *node) } }
- ret = sun8i_phy_clk_create(phy, dev); + ret = sun8i_phy_clk_create(phy, dev, + phy->variant->has_second_pll); if (ret) { dev_err(dev, "Couldn't create the PHY clock\n"); goto err_put_clk_pll1; diff --git a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy_clk.c b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy_clk.c index faea449812f8..a4d31fe3abff 100644 --- a/drivers/gpu/drm/sun4i/sun8i_hdmi_phy_clk.c +++ b/drivers/gpu/drm/sun4i/sun8i_hdmi_phy_clk.c @@ -22,35 +22,45 @@ static int sun8i_phy_clk_determine_rate(struct clk_hw *hw, { unsigned long rate = req->rate; unsigned long best_rate = 0; + struct clk_hw *best_parent = NULL; struct clk_hw *parent; int best_div = 1; - int i; + int i, p;
- parent = clk_hw_get_parent(hw); - - for (i = 1; i <= 16; i++) { - unsigned long ideal = rate * i; - unsigned long rounded; - - rounded = clk_hw_round_rate(parent, ideal); + for (p = 0; p < clk_hw_get_num_parents(hw); p++) { + parent = clk_hw_get_parent_by_index(hw, p); + if (!parent) + continue;
- if (rounded == ideal) { - best_rate = rounded; - best_div = i; - break; + for (i = 1; i <= 16; i++) { + unsigned long ideal = rate * i; + unsigned long rounded; + + rounded = clk_hw_round_rate(parent, ideal); + + if (rounded == ideal) { + best_rate = rounded; + best_div = i; + best_parent = parent; + break; + } + + if (!best_rate || + abs(rate - rounded / i) < + abs(rate - best_rate / best_div)) { + best_rate = rounded; + best_div = i; + best_parent = parent; + } }
- if (!best_rate || - abs(rate - rounded / i) < - abs(rate - best_rate / best_div)) { - best_rate = rounded; - best_div = i; - } + if (best_rate / best_div == rate) + break; }
req->rate = best_rate / best_div; req->best_parent_rate = best_rate; - req->best_parent_hw = parent; + req->best_parent_hw = best_parent;
return 0; } @@ -95,22 +105,58 @@ static int sun8i_phy_clk_set_rate(struct clk_hw *hw, unsigned long rate, return 0; }
+static u8 sun8i_phy_clk_get_parent(struct clk_hw *hw) +{ + struct sun8i_phy_clk *priv = hw_to_phy_clk(hw); + u32 reg; + + regmap_read(priv->phy->regs, SUN8I_HDMI_PHY_PLL_CFG1_REG, ®); + reg = (reg & SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_MSK) >> + SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_SHIFT; + + return reg; +} + +static int sun8i_phy_clk_set_parent(struct clk_hw *hw, u8 index) +{ + struct sun8i_phy_clk *priv = hw_to_phy_clk(hw); + + if (index > 1) + return -EINVAL; + + regmap_update_bits(priv->phy->regs, SUN8I_HDMI_PHY_PLL_CFG1_REG, + SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_MSK, + index << SUN8I_HDMI_PHY_PLL_CFG1_CKIN_SEL_SHIFT); + + return 0; +} + static const struct clk_ops sun8i_phy_clk_ops = { .determine_rate = sun8i_phy_clk_determine_rate, .recalc_rate = sun8i_phy_clk_recalc_rate, .set_rate = sun8i_phy_clk_set_rate, + + .get_parent = sun8i_phy_clk_get_parent, + .set_parent = sun8i_phy_clk_set_parent, };
-int sun8i_phy_clk_create(struct sun8i_hdmi_phy *phy, struct device *dev) +int sun8i_phy_clk_create(struct sun8i_hdmi_phy *phy, struct device *dev, + bool second_parent) { struct clk_init_data init; struct sun8i_phy_clk *priv; - const char *parents[1]; + const char *parents[2];
parents[0] = __clk_get_name(phy->clk_pll0); if (!parents[0]) return -ENODEV;
+ if (second_parent) { + parents[1] = __clk_get_name(phy->clk_pll1); + if (!parents[1]) + return -ENODEV; + } + priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL); if (!priv) return -ENOMEM; @@ -118,7 +164,7 @@ int sun8i_phy_clk_create(struct sun8i_hdmi_phy *phy, struct device *dev) init.name = "hdmi-phy-clk"; init.ops = &sun8i_phy_clk_ops; init.parent_names = parents; - init.num_parents = 1; + init.num_parents = second_parent ? 2 : 1; init.flags = CLK_SET_RATE_PARENT;
priv->phy = phy;