On 6/1/2023 10:00 AM, Luca Weiss wrote:
MSM8226 uses a modified PLL lock sequence compared to MSM8974, which is
based on the function dsi_pll_enable_seq_m in the msm-3.10 kernel.
Worth noting that the msm-3.10 downstream kernel also will try other
sequences in case this one doesn't work, but during testing it has shown
that the _m sequence succeeds first time also:
.pll_enable_seqs[0] = dsi_pll_enable_seq_m,
.pll_enable_seqs[1] = dsi_pll_enable_seq_m,
.pll_enable_seqs[2] = dsi_pll_enable_seq_d,
.pll_enable_seqs[3] = dsi_pll_enable_seq_d,
.pll_enable_seqs[4] = dsi_pll_enable_seq_f1,
.pll_enable_seqs[5] = dsi_pll_enable_seq_c,
.pll_enable_seqs[6] = dsi_pll_enable_seq_e,
We may need to expand this in the future.
Signed-off-by: Luca Weiss <luca@xxxxxxxxx>
---
drivers/gpu/drm/msm/dsi/phy/dsi_phy.c | 2 +
drivers/gpu/drm/msm/dsi/phy/dsi_phy.h | 3 +-
drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c | 97 ++++++++++++++++++++++++++++++
3 files changed, 101 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
index bb09cbe8ff86..9d5795c58a98 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.c
@@ -541,6 +541,8 @@ static const struct of_device_id dsi_phy_dt_match[] = {
.data = &dsi_phy_28nm_hpm_famb_cfgs },
{ .compatible = "qcom,dsi-phy-28nm-lp",
.data = &dsi_phy_28nm_lp_cfgs },
+ { .compatible = "qcom,dsi-phy-28nm-8226",
+ .data = &dsi_phy_28nm_8226_cfgs },
#endif
#ifdef CONFIG_DRM_MSM_DSI_20NM_PHY
{ .compatible = "qcom,dsi-phy-20nm",
diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.h b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.h
index 7137a17ae523..8b640d174785 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy.h
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy.h
@@ -46,8 +46,9 @@ struct msm_dsi_phy_cfg {
extern const struct msm_dsi_phy_cfg dsi_phy_28nm_hpm_cfgs;
extern const struct msm_dsi_phy_cfg dsi_phy_28nm_hpm_famb_cfgs;
extern const struct msm_dsi_phy_cfg dsi_phy_28nm_lp_cfgs;
-extern const struct msm_dsi_phy_cfg dsi_phy_20nm_cfgs;
+extern const struct msm_dsi_phy_cfg dsi_phy_28nm_8226_cfgs;
extern const struct msm_dsi_phy_cfg dsi_phy_28nm_8960_cfgs;
+extern const struct msm_dsi_phy_cfg dsi_phy_20nm_cfgs;
extern const struct msm_dsi_phy_cfg dsi_phy_14nm_cfgs;
extern const struct msm_dsi_phy_cfg dsi_phy_14nm_660_cfgs;
extern const struct msm_dsi_phy_cfg dsi_phy_14nm_2290_cfgs;
diff --git a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c
index 4c1bf55c5f38..ceec7bb87bf1 100644
--- a/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c
+++ b/drivers/gpu/drm/msm/dsi/phy/dsi_phy_28nm.c
@@ -37,6 +37,7 @@
/* v2.0.0 28nm LP implementation */
#define DSI_PHY_28NM_QUIRK_PHY_LP BIT(0)
+#define DSI_PHY_28NM_QUIRK_PHY_8226 BIT(1)
#define LPFR_LUT_SIZE 10
struct lpfr_cfg {
@@ -377,6 +378,74 @@ static int dsi_pll_28nm_vco_prepare_hpm(struct clk_hw *hw)
return ret;
}
+static int dsi_pll_28nm_vco_prepare_8226(struct clk_hw *hw)
+{
+ struct dsi_pll_28nm *pll_28nm = to_pll_28nm(hw);
+ struct device *dev = &pll_28nm->phy->pdev->dev;
+ void __iomem *base = pll_28nm->phy->pll_base;
+ u32 max_reads = 5, timeout_us = 100;
+ bool locked;
+ u32 val;
+ int i;
+
+ DBG("id=%d", pll_28nm->phy->id);
+
+ pll_28nm_software_reset(pll_28nm);
+
+ /*
+ * PLL power up sequence.
+ * Add necessary delays recommended by hardware.
+ */
+ dsi_phy_write(base + REG_DSI_28nm_PHY_PLL_CAL_CFG1, 0x34);
+
+ val = DSI_28nm_PHY_PLL_GLB_CFG_PLL_PWRDN_B;
+ dsi_phy_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 200);
+
+ val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_PWRGEN_PWRDN_B;
+ dsi_phy_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 200);
+
+ val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_LDO_PWRDN_B;
+ val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_ENABLE;
+ dsi_phy_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 600);
+
+ for (i = 0; i < 7; i++) {
+ /* DSI Uniphy lock detect setting */
+ dsi_phy_write(base + REG_DSI_28nm_PHY_PLL_LKDET_CFG2, 0x0d);
+ dsi_phy_write_udelay(base + REG_DSI_28nm_PHY_PLL_LKDET_CFG2,
+ 0x0c, 100);
+ dsi_phy_write(base + REG_DSI_28nm_PHY_PLL_LKDET_CFG2, 0x0d);
+
+ /* poll for PLL ready status */
+ locked = pll_28nm_poll_for_ready(pll_28nm,
+ max_reads, timeout_us);
+ if (locked)
+ break;
+
+ pll_28nm_software_reset(pll_28nm);
+
+ /*
+ * PLL power up sequence.
+ * Add necessary delays recommended by hardware.
+ */
+ dsi_phy_write_udelay(base + REG_DSI_28nm_PHY_PLL_PWRGEN_CFG, 0x00, 50);
+
+ val = DSI_28nm_PHY_PLL_GLB_CFG_PLL_PWRDN_B;
+ val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_PWRGEN_PWRDN_B;
+ dsi_phy_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 100);
+
+ val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_LDO_PWRDN_B;
+ val |= DSI_28nm_PHY_PLL_GLB_CFG_PLL_ENABLE;
+ dsi_phy_write_udelay(base + REG_DSI_28nm_PHY_PLL_GLB_CFG, val, 600);
+ }
+
+ if (unlikely(!locked))
+ DRM_DEV_ERROR(dev, "DSI PLL lock failed\n");
+ else
+ DBG("DSI PLL Lock success");
+
+ return locked ? 0 : -EINVAL;
+}
+
Could you please share the downstream reference you used to come up with
this sequence?
Thanks and Regards,
Jeykumar S.
static int dsi_pll_28nm_vco_prepare_lp(struct clk_hw *hw)
{
struct dsi_pll_28nm *pll_28nm = to_pll_28nm(hw);
@@ -471,6 +540,15 @@ static const struct clk_ops clk_ops_dsi_pll_28nm_vco_lp = {
.is_enabled = dsi_pll_28nm_clk_is_enabled,
};
+static const struct clk_ops clk_ops_dsi_pll_28nm_vco_8226 = {
+ .round_rate = dsi_pll_28nm_clk_round_rate,
+ .set_rate = dsi_pll_28nm_clk_set_rate,
+ .recalc_rate = dsi_pll_28nm_clk_recalc_rate,
+ .prepare = dsi_pll_28nm_vco_prepare_8226,
+ .unprepare = dsi_pll_28nm_vco_unprepare,
+ .is_enabled = dsi_pll_28nm_clk_is_enabled,
+};
+
/*
* PLL Callbacks
*/
@@ -536,6 +614,8 @@ static int pll_28nm_register(struct dsi_pll_28nm *pll_28nm, struct clk_hw **prov
if (pll_28nm->phy->cfg->quirks & DSI_PHY_28NM_QUIRK_PHY_LP)
vco_init.ops = &clk_ops_dsi_pll_28nm_vco_lp;
+ else if (pll_28nm->phy->cfg->quirks & DSI_PHY_28NM_QUIRK_PHY_8226)
+ vco_init.ops = &clk_ops_dsi_pll_28nm_vco_8226;
else
vco_init.ops = &clk_ops_dsi_pll_28nm_vco_hpm;
@@ -820,3 +900,20 @@ const struct msm_dsi_phy_cfg dsi_phy_28nm_lp_cfgs = {
.quirks = DSI_PHY_28NM_QUIRK_PHY_LP,
};
+const struct msm_dsi_phy_cfg dsi_phy_28nm_8226_cfgs = {
+ .has_phy_regulator = true,
+ .regulator_data = dsi_phy_28nm_regulators,
+ .num_regulators = ARRAY_SIZE(dsi_phy_28nm_regulators),
+ .ops = {
+ .enable = dsi_28nm_phy_enable,
+ .disable = dsi_28nm_phy_disable,
+ .pll_init = dsi_pll_28nm_init,
+ .save_pll_state = dsi_28nm_pll_save_state,
+ .restore_pll_state = dsi_28nm_pll_restore_state,
+ },
+ .min_pll_rate = VCO_MIN_RATE,
+ .max_pll_rate = VCO_MAX_RATE,
+ .io_start = { 0xfd922b00 },
+ .num_dsi_phy = 1,
+ .quirks = DSI_PHY_28NM_QUIRK_PHY_8226,
+};
