[PATCH 16/59] drm/kmb: Part6 of Mipi Tx Initialization
Anitha Chrisanthus
anitha.chrisanthus at intel.com
Tue Jun 30 21:27:28 UTC 2020
This is part2 of DPHY initialization- sets up DPHY PLLs.
v2: simplified mipi_tx_get_vco_params() based on review
v3: added WARN_ON for invalid freq
v4: fixed bug in mipi_tx_get_vco_params
Signed-off-by: Anitha Chrisanthus <anitha.chrisanthus at intel.com>
Reviewed-by: Bob Paauwe <bob.j.paauwe at intel.com>
---
drivers/gpu/drm/kmb/kmb_dsi.c | 194 +++++++++++++++++++++++++++++++++++++++--
drivers/gpu/drm/kmb/kmb_regs.h | 2 +
2 files changed, 189 insertions(+), 7 deletions(-)
diff --git a/drivers/gpu/drm/kmb/kmb_dsi.c b/drivers/gpu/drm/kmb/kmb_dsi.c
index d6cd1f9..b7f23af 100644
--- a/drivers/gpu/drm/kmb/kmb_dsi.c
+++ b/drivers/gpu/drm/kmb/kmb_dsi.c
@@ -48,11 +48,33 @@
#define MIPI_TX_CFG_CLK_KHZ 24000
/*DPHY Tx test codes*/
-#define TEST_CODE_HS_FREQ_RANGE_CFG 0x44
-#define TEST_CODE_PLL_ANALOG_PROG 0x1F
-#define TEST_CODE_SLEW_RATE_OVERRIDE_CTRL 0xA0
-#define TEST_CODE_SLEW_RATE_DDL_LOOP_CTRL 0xA3
-#define TEST_CODE_SLEW_RATE_DDL_CYCLES 0xA4
+#define TEST_CODE_PLL_PROPORTIONAL_CHARGE_PUMP_CTRL 0x0E
+#define TEST_CODE_PLL_INTEGRAL_CHARGE_PUMP_CTRL 0x0F
+#define TEST_CODE_PLL_VCO_CTRL 0x12
+#define TEST_CODE_PLL_GMP_CTRL 0x13
+#define TEST_CODE_PLL_PHASE_ERR_CTRL 0x14
+#define TEST_CODE_PLL_LOCK_FILTER 0x15
+#define TEST_CODE_PLL_UNLOCK_FILTER 0x16
+#define TEST_CODE_PLL_INPUT_DIVIDER 0x17
+#define TEST_CODE_PLL_FEEDBACK_DIVIDER 0x18
+#define PLL_FEEDBACK_DIVIDER_HIGH (1 << 7)
+#define TEST_CODE_PLL_OUTPUT_CLK_SEL 0x19
+#define PLL_N_OVR_EN (1 << 4)
+#define PLL_M_OVR_EN (1 << 5)
+#define TEST_CODE_PLL_CHARGE_PUMP_BIAS 0x1C
+#define TEST_CODE_PLL_LOCK_DETECTOR 0x1D
+#define TEST_CODE_HS_FREQ_RANGE_CFG 0x44
+#define TEST_CODE_PLL_ANALOG_PROG 0x1F
+#define TEST_CODE_SLEW_RATE_OVERRIDE_CTRL 0xA0
+#define TEST_CODE_SLEW_RATE_DDL_LOOP_CTRL 0xA3
+#define TEST_CODE_SLEW_RATE_DDL_CYCLES 0xA4
+
+/* D-Phy params */
+#define PLL_N_MIN 0
+#define PLL_N_MAX 15
+#define PLL_M_MIN 62
+#define PLL_M_MAX 623
+#define PLL_FVCO_MAX 1250
/*
* These are added here only temporarily for testing,
@@ -800,8 +822,158 @@ static inline void set_test_mode_src_osc_freq_target_hi_bits(u32 dphy_no,
test_mode_send(dphy_no, TEST_CODE_SLEW_RATE_DDL_CYCLES, data);
}
+struct vco_params {
+ u32 freq;
+ u32 range;
+ u32 divider;
+};
+
+static struct vco_params vco_table[] = {
+ {52, 0x3f, 8},
+ {80, 0x39, 8},
+ {105, 0x2f, 4},
+ {160, 0x29, 4},
+ {210, 0x1f, 2},
+ {320, 0x19, 2},
+ {420, 0x0f, 1},
+ {630, 0x09, 1},
+ {1100, 0x03, 1},
+ {0xffff, 0x01, 1},
+};
+
+static void mipi_tx_get_vco_params(struct vco_params *vco)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vco_table); i++) {
+ if (vco->freq < vco_table[i].freq) {
+ *vco = vco_table[i];
+ return;
+ }
+ }
+ WARN_ONCE(1, "Invalid vco freq = %u for PLL setup\n", vco->freq);
+}
+
+static void mipi_tx_pll_setup(u32 dphy_no, u32 ref_clk_mhz, u32 target_freq_mhz)
+{
+ /* pll_ref_clk: - valid range: 2~64 MHz; Typically 24 MHz
+ * Fvco: - valid range: 320~1250 MHz (Gen3 D-PHY)
+ * Fout: - valid range: 40~1250 MHz (Gen3 D-PHY)
+ * n: - valid range [0 15]
+ * N: - N = n + 1
+ * -valid range: [1 16]
+ * -conditions: - (pll_ref_clk / N) >= 2 MHz
+ * -(pll_ref_clk / N) <= 8 MHz
+ * m: valid range [62 623]
+ * M: - M = m + 2
+ * -valid range [64 625]
+ * -Fvco = (M/N) * pll_ref_clk
+ */
+ struct vco_params vco_p = {
+ .range = 0,
+ .divider = 1,
+ };
+ u32 best_n = 0, best_m = 0;
+ u32 n = 0, m = 0, div = 0, delta, freq = 0, t_freq;
+ u32 best_freq_delta = 3000;
+
+ vco_p.freq = target_freq_mhz;
+ mipi_tx_get_vco_params(&vco_p);
+ /*search pll n parameter */
+ for (n = PLL_N_MIN; n <= PLL_N_MAX; n++) {
+ /*calculate the pll input frequency division ratio
+ * multiply by 1000 for precision -
+ * no floating point, add n for rounding
+ */
+ div = ((ref_clk_mhz * 1000) + n)/(n+1);
+ /*found a valid n parameter */
+ if ((div < 2000 || div > 8000))
+ continue;
+ /*search pll m parameter */
+ for (m = PLL_M_MIN; m <= PLL_M_MAX; m++) {
+ /*calculate the Fvco(DPHY PLL output frequency)
+ * using the current n,m params
+ */
+ freq = div * (m + 2);
+ freq /= 1000;
+ /* trim the potential pll freq to max supported*/
+ if (freq > PLL_FVCO_MAX)
+ continue;
+
+ delta = abs(freq - target_freq_mhz);
+ /*select the best (closest to target pll freq)
+ * n,m parameters so far
+ */
+ if (delta < best_freq_delta) {
+ best_n = n;
+ best_m = m;
+ best_freq_delta = delta;
+ }
+ }
+ }
+
+ /*Program vco_cntrl parameter
+ *PLL_VCO_Control[5:0] = pll_vco_cntrl_ovr,
+ * PLL_VCO_Control[6] = pll_vco_cntrl_ovr_en
+ */
+ test_mode_send(dphy_no, TEST_CODE_PLL_VCO_CTRL, (vco_p.range
+ | (1 << 6)));
+
+ /*Program m, n pll parameters */
+
+ /*PLL_Input_Divider_Ratio[3:0] = pll_n_ovr */
+ test_mode_send(dphy_no, TEST_CODE_PLL_INPUT_DIVIDER, (best_n & 0x0f));
+
+ /* m - low nibble PLL_Loop_Divider_Ratio[4:0] = pll_m_ovr[4:0] */
+ test_mode_send(dphy_no, TEST_CODE_PLL_FEEDBACK_DIVIDER,
+ (best_m & 0x1f));
+
+ /*m -high nibble PLL_Loop_Divider_Ratio[4:0] = pll_m_ovr[9:5] */
+ test_mode_send(dphy_no, TEST_CODE_PLL_FEEDBACK_DIVIDER,
+ ((best_m >> 5) & 0x1f) | PLL_FEEDBACK_DIVIDER_HIGH);
+
+ /*enable overwrite of n,m parameters :pll_n_ovr_en, pll_m_ovr_en*/
+ test_mode_send(dphy_no, TEST_CODE_PLL_OUTPUT_CLK_SEL,
+ (PLL_N_OVR_EN | PLL_M_OVR_EN));
+
+ /*Program Charge-Pump parameters */
+
+ /*pll_prop_cntrl-fixed values for prop_cntrl from DPHY doc */
+ t_freq = target_freq_mhz * vco_p.divider;
+ test_mode_send(dphy_no, TEST_CODE_PLL_PROPORTIONAL_CHARGE_PUMP_CTRL,
+ ((t_freq > 1150) ? 0x0C : 0x0B));
+
+ /*pll_int_cntrl-fixed value for int_cntrl from DPHY doc */
+ test_mode_send(dphy_no, TEST_CODE_PLL_INTEGRAL_CHARGE_PUMP_CTRL,
+ 0x00);
+
+ /*pll_gmp_cntrl-fixed value for gmp_cntrl from DPHY doci */
+ test_mode_send(dphy_no, TEST_CODE_PLL_GMP_CTRL, 0x10);
+
+ /*pll_cpbias_cntrl-fixed value for cpbias_cntrl from DPHY doc */
+ test_mode_send(dphy_no, TEST_CODE_PLL_CHARGE_PUMP_BIAS, 0x10);
+
+ /*PLL Lock Configuration */
+
+ /*pll_th1 -Lock Detector Phase error threshold,
+ * document gives fixed value
+ */
+ test_mode_send(dphy_no, TEST_CODE_PLL_PHASE_ERR_CTRL, 0x02);
+
+ /*pll_th2 - Lock Filter length, document gives fixed value */
+ test_mode_send(dphy_no, TEST_CODE_PLL_LOCK_FILTER, 0x60);
+
+ /*pll_th3- PLL Unlocking filter, document gives fixed value */
+ test_mode_send(dphy_no, TEST_CODE_PLL_UNLOCK_FILTER, 0x03);
+
+ /*pll_lock_sel-PLL Lock Detector Selection, document gives
+ * fixed value
+ */
+ test_mode_send(dphy_no, TEST_CODE_PLL_LOCK_DETECTOR, 0x02);
+}
+
static void dphy_init_sequence(struct mipi_ctrl_cfg *cfg, u32 dphy_no,
- enum dphy_mode mode)
+ enum dphy_mode mode)
{
u32 test_code = 0;
u32 test_data = 0, val;
@@ -904,7 +1076,15 @@ static void dphy_init_sequence(struct mipi_ctrl_cfg *cfg, u32 dphy_no,
/*Set PLL regulator in bypass */
test_mode_send(dphy_no, TEST_CODE_PLL_ANALOG_PROG, 0x01);
- /*TODO - PLL Parameters Setup */
+ /* PLL Parameters Setup */
+ mipi_tx_pll_setup(dphy_no, cfg->ref_clk_khz/1000,
+ cfg->lane_rate_mbps/2);
+
+ /*Set clksel */
+ kmb_write_bits_mipi(DPHY_INIT_CTRL1, 18, 2, 0x01);
+
+ /*Set pll_shadow_control */
+ kmb_write_bits_mipi(DPHY_INIT_CTRL1, 16, 1, 0x01);
}
/*Send NORMAL OPERATION test code */
diff --git a/drivers/gpu/drm/kmb/kmb_regs.h b/drivers/gpu/drm/kmb/kmb_regs.h
index 5921f709..dedee04 100644
--- a/drivers/gpu/drm/kmb/kmb_regs.h
+++ b/drivers/gpu/drm/kmb/kmb_regs.h
@@ -524,6 +524,7 @@
/* D-PHY regs */
#define DPHY_ENABLE (0x100)
#define DPHY_INIT_CTRL0 (0x104)
+#define DPHY_INIT_CTRL1 (0x108)
#define SHUTDOWNZ 0
#define RESETZ 12
#define DPHY_INIT_CTRL2 (0x10c)
@@ -533,6 +534,7 @@
#define CLR_DPHY_INIT_CTRL0(dphy, offset) \
kmb_clr_bit_mipi(DPHY_INIT_CTRL0, \
(dphy+offset))
+#define DPHY_INIT_CTRL2 (0x10c)
#define DPHY_FREQ_CTRL0_3 (0x11c)
#define SET_DPHY_FREQ_CTRL0_3(dphy, val) \
kmb_write_bits_mipi(DPHY_FREQ_CTRL0_3 \
--
2.7.4
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