[Intel-gfx] [PATCH] drm/i915/bxt: Additional MIPI clock divider form B0 stepping onwards
Deepak M
m.deepak at intel.com
Wed Feb 3 11:16:45 UTC 2016
The MIPI clock calculations for the addtional clock
are revised from B0 stepping onwards, the bit definitions
have changed compared to old stepping.
v2: Fixing compilation warning.
Signed-off-by: Deepak M <m.deepak at intel.com>
---
drivers/gpu/drm/i915/i915_reg.h | 104 +++++++++++++++++------------------
drivers/gpu/drm/i915/intel_dsi_pll.c | 64 ++++++++++++++-------
2 files changed, 95 insertions(+), 73 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index c0bd691..2568f35 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -7638,6 +7638,57 @@ enum skl_disp_power_wells {
/* MIPI DSI registers */
+#define BXT_MIPI1_RX_LOWER_SHIFT 16
+#define BXT_MIPI2_RX_LOWER_SHIFT 0
+#define BXT_MIPI_RX_LOWER_SHIFT(port) \
+ _MIPI_PORT(port, BXT_MIPI1_RX_LOWER_SHIFT, \
+ BXT_MIPI2_RX_LOWER_SHIFT)
+#define BXT_MIPI1_RX_LOWER_DIVIDER_MASK (3 << 16)
+#define BXT_MIPI2_RX_LOWER_DIVIDER_MASK (3 << 0)
+#define BXT_MIPI_RX_LOWER_DIVIDER_MASK(port) \
+ (3 << BXT_MIPI_RX_LOWER_SHIFT(port))
+#define BXT_MIPI_RX_LOWER_DIVIDER(port, val) \
+ ((val & 3) << BXT_MIPI_RX_LOWER_SHIFT(port))
+
+#define BXT_MIPI1_8X_BY3_SHIFT 19
+#define BXT_MIPI2_8X_BY3_SHIFT 3
+#define BXT_MIPI_8X_BY3_SHIFT(port) \
+ _MIPI_PORT(port, BXT_MIPI1_8X_BY3_SHIFT, \
+ BXT_MIPI2_8X_BY3_SHIFT)
+#define BXT_MIPI1_8X_BY3_DIVIDER_MASK (3 << 19)
+#define BXT_MIPI2_8X_BY3_DIVIDER_MASK (3 << 3)
+#define BXT_MIPI_8X_BY3_DIVIDER_MASK(port) \
+ (3 << BXT_MIPI_8X_BY3_SHIFT(port))
+#define BXT_MIPI_8X_BY3_DIVIDER(port, val) \
+ ((val & 3) << BXT_MIPI_8X_BY3_SHIFT(port))
+
+#define BXT_MIPI1_RX_UPPER_SHIFT 21
+#define BXT_MIPI2_RX_UPPER_SHIFT 5
+#define BXT_MIPI_RX_UPPER_SHIFT(port) \
+ _MIPI_PORT(port, BXT_MIPI1_RX_UPPER_SHIFT, \
+ BXT_MIPI2_RX_UPPER_SHIFT)
+#define BXT_MIPI1_RX_UPPER_DIVIDER_MASK (3 << 21)
+#define BXT_MIPI2_RX_UPPER_DIVIDER_MASK (3 << 5)
+#define BXT_MIPI_RX_UPPER_DIVIDER_MASK(port) \
+ (3 << BXT_MIPI_RX_UPPER_SHIFT(port))
+#define BXT_MIPI_RX_UPPER_DIVIDER(port, val) \
+ ((val & 3) << BXT_MIPI_RX_UPPER_SHIFT(port))
+
+#define BXT_MIPI1_TX_SHIFT 26
+#define BXT_MIPI2_TX_SHIFT 10
+#define BXT_MIPI_TX_SHIFT(port) \
+ _MIPI_PORT(port, BXT_MIPI1_TX_SHIFT, \
+ BXT_MIPI2_TX_SHIFT)
+#define BXT_MIPI1_TX_DIVIDER_MASK (0x3F << 26)
+#define BXT_MIPI2_TX_DIVIDER_MASK (0x3F << 10)
+#define BXT_MIPI_TX_DIVIDER_MASK(port) \
+ (0x3F << BXT_MIPI_TX_SHIFT(port))
+#define BXT_MIPI_TX_DIVIDER(port, val) \
+ ((val & 0x3F) << BXT_MIPI_TX_SHIFT(port))
+
+#define RX_DIVIDER_BIT_1_2 0x3
+#define RX_DIVIDER_BIT_3_4 0xC
+
#define _MIPI_PORT(port, a, c) _PORT3(port, a, 0, c) /* ports A and C only */
#define _MMIO_MIPI(port, a, c) _MMIO(_MIPI_PORT(port, a, c))
@@ -7650,59 +7701,6 @@ enum skl_disp_power_wells {
#define BXT_MIPI_DIV_SHIFT(port) \
_MIPI_PORT(port, BXT_MIPI1_DIV_SHIFT, \
BXT_MIPI2_DIV_SHIFT)
-/* Var clock divider to generate TX source. Result must be < 39.5 M */
-#define BXT_MIPI1_ESCLK_VAR_DIV_MASK (0x3F << 26)
-#define BXT_MIPI2_ESCLK_VAR_DIV_MASK (0x3F << 10)
-#define BXT_MIPI_ESCLK_VAR_DIV_MASK(port) \
- _MIPI_PORT(port, BXT_MIPI1_ESCLK_VAR_DIV_MASK, \
- BXT_MIPI2_ESCLK_VAR_DIV_MASK)
-
-#define BXT_MIPI_ESCLK_VAR_DIV(port, val) \
- (val << BXT_MIPI_DIV_SHIFT(port))
-/* TX control divider to select actual TX clock output from (8x/var) */
-#define BXT_MIPI1_TX_ESCLK_SHIFT 21
-#define BXT_MIPI2_TX_ESCLK_SHIFT 5
-#define BXT_MIPI_TX_ESCLK_SHIFT(port) \
- _MIPI_PORT(port, BXT_MIPI1_TX_ESCLK_SHIFT, \
- BXT_MIPI2_TX_ESCLK_SHIFT)
-#define BXT_MIPI1_TX_ESCLK_FIXDIV_MASK (3 << 21)
-#define BXT_MIPI2_TX_ESCLK_FIXDIV_MASK (3 << 5)
-#define BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port) \
- _MIPI_PORT(port, BXT_MIPI1_TX_ESCLK_FIXDIV_MASK, \
- BXT_MIPI2_TX_ESCLK_FIXDIV_MASK)
-#define BXT_MIPI_TX_ESCLK_8XDIV_BY2(port) \
- (0x0 << BXT_MIPI_TX_ESCLK_SHIFT(port))
-#define BXT_MIPI_TX_ESCLK_8XDIV_BY4(port) \
- (0x1 << BXT_MIPI_TX_ESCLK_SHIFT(port))
-#define BXT_MIPI_TX_ESCLK_8XDIV_BY8(port) \
- (0x2 << BXT_MIPI_TX_ESCLK_SHIFT(port))
-/* RX control divider to select actual RX clock output from 8x*/
-#define BXT_MIPI1_RX_ESCLK_SHIFT 19
-#define BXT_MIPI2_RX_ESCLK_SHIFT 3
-#define BXT_MIPI_RX_ESCLK_SHIFT(port) \
- _MIPI_PORT(port, BXT_MIPI1_RX_ESCLK_SHIFT, \
- BXT_MIPI2_RX_ESCLK_SHIFT)
-#define BXT_MIPI1_RX_ESCLK_FIXDIV_MASK (3 << 19)
-#define BXT_MIPI2_RX_ESCLK_FIXDIV_MASK (3 << 3)
-#define BXT_MIPI_RX_ESCLK_FIXDIV_MASK(port) \
- (3 << BXT_MIPI_RX_ESCLK_SHIFT(port))
-#define BXT_MIPI_RX_ESCLK_8X_BY2(port) \
- (1 << BXT_MIPI_RX_ESCLK_SHIFT(port))
-#define BXT_MIPI_RX_ESCLK_8X_BY3(port) \
- (2 << BXT_MIPI_RX_ESCLK_SHIFT(port))
-#define BXT_MIPI_RX_ESCLK_8X_BY4(port) \
- (3 << BXT_MIPI_RX_ESCLK_SHIFT(port))
-/* BXT-A WA: Always prog DPHY dividers to 00 */
-#define BXT_MIPI1_DPHY_DIV_SHIFT 16
-#define BXT_MIPI2_DPHY_DIV_SHIFT 0
-#define BXT_MIPI_DPHY_DIV_SHIFT(port) \
- _MIPI_PORT(port, BXT_MIPI1_DPHY_DIV_SHIFT, \
- BXT_MIPI2_DPHY_DIV_SHIFT)
-#define BXT_MIPI_1_DPHY_DIVIDER_MASK (3 << 16)
-#define BXT_MIPI_2_DPHY_DIVIDER_MASK (3 << 0)
-#define BXT_MIPI_DPHY_DIVIDER_MASK(port) \
- (3 << BXT_MIPI_DPHY_DIV_SHIFT(port))
-
/* BXT MIPI mode configure */
#define _BXT_MIPIA_TRANS_HACTIVE 0x6B0F8
#define _BXT_MIPIC_TRANS_HACTIVE 0x6B8F8
diff --git a/drivers/gpu/drm/i915/intel_dsi_pll.c b/drivers/gpu/drm/i915/intel_dsi_pll.c
index bb5e95a..7435115 100644
--- a/drivers/gpu/drm/i915/intel_dsi_pll.c
+++ b/drivers/gpu/drm/i915/intel_dsi_pll.c
@@ -362,35 +362,59 @@ static void vlv_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
/* Program BXT Mipi clocks and dividers */
static void bxt_dsi_program_clocks(struct drm_device *dev, enum port port)
{
- u32 tmp;
- u32 divider;
- u32 dsi_rate;
- u32 pll_ratio;
struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 tmp;
+ u32 dsi_rate = 0;
+ u32 pll_ratio = 0;
+ u32 rx_div;
+ u32 tx_div;
+ u32 rx_div_upper;
+ u32 rx_div_lower;
+ u32 mipi_8by3_divider;
/* Clear old configurations */
tmp = I915_READ(BXT_MIPI_CLOCK_CTL);
- tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
- tmp &= ~(BXT_MIPI_RX_ESCLK_FIXDIV_MASK(port));
- tmp &= ~(BXT_MIPI_ESCLK_VAR_DIV_MASK(port));
- tmp &= ~(BXT_MIPI_DPHY_DIVIDER_MASK(port));
+ tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port));
+ tmp &= ~(BXT_MIPI_RX_LOWER_DIVIDER_MASK(port));
+ tmp &= ~(BXT_MIPI_RX_UPPER_DIVIDER_MASK(port));
+ tmp &= ~(BXT_MIPI_TX_DIVIDER_MASK(port));
/* Get the current DSI rate(actual) */
pll_ratio = I915_READ(BXT_DSI_PLL_CTL) &
- BXT_DSI_PLL_RATIO_MASK;
+ BXT_DSI_PLL_RATIO_MASK;
+
+ /* To get 8X clock, divide ref_freq * pll ratio by 2 as per bspec */
dsi_rate = (BXT_REF_CLOCK_KHZ * pll_ratio) / 2;
- /* Max possible output of clock is 39.5 MHz, program value -1 */
- divider = (dsi_rate / BXT_MAX_VAR_OUTPUT_KHZ) - 1;
- tmp |= BXT_MIPI_ESCLK_VAR_DIV(port, divider);
+ /*
+ * tx clock should be <= 20MHz and the div value must be
+ * subtracted by 1 as per bspec
+ */
+ tx_div = DIV_ROUND_UP(dsi_rate, 20000) - 1;
+ /*
+ * rx clock should be <= 150MHz and the div value must be
+ * subtracted by 1 as per bspec
+ */
+ rx_div = DIV_ROUND_UP(dsi_rate, 150000) - 1;
/*
- * Tx escape clock must be as close to 20MHz possible, but should
- * not exceed it. Hence select divide by 2
+ * rx divider value needs to be updated in the
+ * two differnt bit fields in the register hence splitting the
+ * rx divider value accordingly
*/
- tmp |= BXT_MIPI_TX_ESCLK_8XDIV_BY2(port);
+ rx_div_lower = rx_div & RX_DIVIDER_BIT_1_2;
+ rx_div_upper = (rx_div & RX_DIVIDER_BIT_3_4) >> 2;
+
+ /* As per bpsec program the 8/3X clock divider to the below value */
+ if (dev_priv->vbt.dsi.config->is_cmd_mode)
+ mipi_8by3_divider = 0x2;
+ else
+ mipi_8by3_divider = 0x3;
- tmp |= BXT_MIPI_RX_ESCLK_8X_BY3(port);
+ tmp |= BXT_MIPI_8X_BY3_DIVIDER(port, mipi_8by3_divider);
+ tmp |= BXT_MIPI_TX_DIVIDER(port, tx_div);
+ tmp |= BXT_MIPI_RX_LOWER_DIVIDER(port, rx_div_lower);
+ tmp |= BXT_MIPI_RX_UPPER_DIVIDER(port, rx_div_upper);
I915_WRITE(BXT_MIPI_CLOCK_CTL, tmp);
}
@@ -512,10 +536,10 @@ static void bxt_dsi_reset_clocks(struct intel_encoder *encoder, enum port port)
/* Clear old configurations */
tmp = I915_READ(BXT_MIPI_CLOCK_CTL);
- tmp &= ~(BXT_MIPI_TX_ESCLK_FIXDIV_MASK(port));
- tmp &= ~(BXT_MIPI_RX_ESCLK_FIXDIV_MASK(port));
- tmp &= ~(BXT_MIPI_ESCLK_VAR_DIV_MASK(port));
- tmp &= ~(BXT_MIPI_DPHY_DIVIDER_MASK(port));
+ tmp &= ~(BXT_MIPI_8X_BY3_DIVIDER_MASK(port));
+ tmp &= ~(BXT_MIPI_RX_LOWER_DIVIDER_MASK(port));
+ tmp &= ~(BXT_MIPI_RX_UPPER_DIVIDER_MASK(port));
+ tmp &= ~(BXT_MIPI_TX_DIVIDER_MASK(port));
I915_WRITE(BXT_MIPI_CLOCK_CTL, tmp);
I915_WRITE(MIPI_EOT_DISABLE(port), CLOCKSTOP);
}
--
1.9.1
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