[PATCH 2/2] drm/i915/dsi: fix dphy param field widths and range checks for chv+

[Jani Nikula <jani.nikula@intel.com>]

Current CHV and BXT bspec says the dphy param register has four 8-bit
fields instead of the smaller VLV field widths. CHV bspec mentions the
register has changed since K0, but there's no indication of what exactly
changed. Lacking further details, change the field widths for all CHV
and later.

Define the max values based on the platform. Also define them based on
the register definitions instead of duplicating information.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=106130
Cc: stable@vger.kernel.org
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h      | 11 +++++++----
 drivers/gpu/drm/i915/intel_dsi_vbt.c | 31 +++++++++++++++++++------------
 2 files changed, 26 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index fb106026a1f4..f4435a13b757 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -9547,14 +9547,17 @@ enum skl_power_gate {
 #define _MIPIA_DPHY_PARAM		(dev_priv->mipi_mmio_base + 0xb080)
 #define _MIPIC_DPHY_PARAM		(dev_priv->mipi_mmio_base + 0xb880)
 #define MIPI_DPHY_PARAM(port)		_MMIO_MIPI(port, _MIPIA_DPHY_PARAM, _MIPIC_DPHY_PARAM)
-#define  EXIT_ZERO_COUNT_SHIFT				24
 #define  EXIT_ZERO_COUNT_MASK				(0x3f << 24)
-#define  TRAIL_COUNT_SHIFT				16
+#define  EXIT_ZERO_COUNT_MASK_CHV			(0xff << 24)
+#define  EXIT_ZERO_COUNT_SHIFT				24
 #define  TRAIL_COUNT_MASK				(0x1f << 16)
-#define  CLK_ZERO_COUNT_SHIFT				8
+#define  TRAIL_COUNT_MASK_CHV				(0xff << 16)
+#define  TRAIL_COUNT_SHIFT				16
 #define  CLK_ZERO_COUNT_MASK				(0xff << 8)
-#define  PREPARE_COUNT_SHIFT				0
+#define  CLK_ZERO_COUNT_SHIFT				8
 #define  PREPARE_COUNT_MASK				(0x3f << 0)
+#define  PREPARE_COUNT_MASK_CHV				(0xff << 0)
+#define  PREPARE_COUNT_SHIFT				0
 
 /* bits 31:0 */
 #define _MIPIA_DBI_BW_CTRL		(dev_priv->mipi_mmio_base + 0xb084)
diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c b/drivers/gpu/drm/i915/intel_dsi_vbt.c
index 4d6ffa7b3e7b..8d3dea693840 100644
--- a/drivers/gpu/drm/i915/intel_dsi_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c
@@ -41,10 +41,17 @@
 #define MIPI_VIRTUAL_CHANNEL_SHIFT	1
 #define MIPI_PORT_SHIFT			3
 
-#define PREPARE_CNT_MAX		0x3F
-#define EXIT_ZERO_CNT_MAX	0x3F
-#define CLK_ZERO_CNT_MAX	0xFF
-#define TRAIL_CNT_MAX		0x1F
+#define EXIT_ZERO_CNT_MAX(dev_priv) \
+	((IS_VALLEYVIEW(dev_priv) ? EXIT_ZERO_COUNT_MASK : EXIT_ZERO_COUNT_MASK_CHV) >> EXIT_ZERO_COUNT_SHIFT)
+
+#define TRAIL_CNT_MAX(dev_priv) \
+	((IS_VALLEYVIEW(dev_priv) ? TRAIL_COUNT_MASK : TRAIL_COUNT_MASK_CHV) >> TRAIL_COUNT_SHIFT)
+
+#define CLK_ZERO_CNT_MAX(dev_priv) \
+	(CLK_ZERO_COUNT_MASK >> CLK_ZERO_COUNT_SHIFT)
+
+#define PREPARE_CNT_MAX(dev_priv)					\
+	((IS_VALLEYVIEW(dev_priv) ? PREPARE_COUNT_MASK : PREPARE_COUNT_MASK_CHV) >> PREPARE_COUNT_SHIFT)
 
 #define NS_KHZ_RATIO 1000000
 
@@ -647,9 +654,9 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
 	/* prepare count */
 	prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * ui_den, ui_num * mul);
 
-	if (prepare_cnt > PREPARE_CNT_MAX) {
+	if (prepare_cnt > PREPARE_CNT_MAX(dev_priv)) {
 		DRM_DEBUG_KMS("prepare count too high %u\n", prepare_cnt);
-		prepare_cnt = PREPARE_CNT_MAX;
+		prepare_cnt = PREPARE_CNT_MAX(dev_priv);
 	}
 
 	/* exit zero count */
@@ -667,9 +674,9 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
 	if (exit_zero_cnt < (55 * ui_den / ui_num) && (55 * ui_den) % ui_num)
 		exit_zero_cnt += 1;
 
-	if (exit_zero_cnt > EXIT_ZERO_CNT_MAX) {
+	if (exit_zero_cnt > EXIT_ZERO_CNT_MAX(dev_priv)) {
 		DRM_DEBUG_KMS("exit zero count too high %u\n", exit_zero_cnt);
-		exit_zero_cnt = EXIT_ZERO_CNT_MAX;
+		exit_zero_cnt = EXIT_ZERO_CNT_MAX(dev_priv);
 	}
 
 	/* clk zero count */
@@ -677,18 +684,18 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
 				(tclk_prepare_clkzero -	ths_prepare_ns)
 				* ui_den, ui_num * mul);
 
-	if (clk_zero_cnt > CLK_ZERO_CNT_MAX) {
+	if (clk_zero_cnt > CLK_ZERO_CNT_MAX(dev_priv)) {
 		DRM_DEBUG_KMS("clock zero count too high %u\n", clk_zero_cnt);
-		clk_zero_cnt = CLK_ZERO_CNT_MAX;
+		clk_zero_cnt = CLK_ZERO_CNT_MAX(dev_priv);
 	}
 
 	/* trail count */
 	tclk_trail_ns = max(mipi_config->tclk_trail, mipi_config->ths_trail);
 	trail_cnt = DIV_ROUND_UP(tclk_trail_ns * ui_den, ui_num * mul);
 
-	if (trail_cnt > TRAIL_CNT_MAX) {
+	if (trail_cnt > TRAIL_CNT_MAX(dev_priv)) {
 		DRM_DEBUG_KMS("trail count too high %u\n", trail_cnt);
-		trail_cnt = TRAIL_CNT_MAX;
+		trail_cnt = TRAIL_CNT_MAX(dev_priv);
 	}
 
 	/* B080 */
-- 
2.11.0