[Intel-gfx] [PATCH v3 14/20] drm/i915/icl: Program DSI clock and data lane timing params
Madhav Chauhan
madhav.chauhan at intel.com
Thu Jul 5 13:02:01 UTC 2018
This patch programs D-PHY timing parameters for the
clock and data lane (in escape clocks) of DSI
controller (DSI port 0 and 1).
These programmed timings would be used by DSI Controller
to calculate link transition latencies of the data and
clock lanes.
Signed-off-by: Madhav Chauhan <madhav.chauhan at intel.com>
---
drivers/gpu/drm/i915/gen11_dsi.c | 18 ++++
drivers/gpu/drm/i915/intel_dsi.h | 3 +
drivers/gpu/drm/i915/intel_dsi_vbt.c | 200 +++++++++++++++++++++++++----------
3 files changed, 165 insertions(+), 56 deletions(-)
diff --git a/drivers/gpu/drm/i915/gen11_dsi.c b/drivers/gpu/drm/i915/gen11_dsi.c
index db65633..ffc17d1 100644
--- a/drivers/gpu/drm/i915/gen11_dsi.c
+++ b/drivers/gpu/drm/i915/gen11_dsi.c
@@ -284,6 +284,24 @@ static void gen11_dsi_setup_dphy_timings(struct intel_encoder *encoder)
tmp |= intel_dsi->init_count;
I915_WRITE(ICL_DSI_T_INIT_MASTER(port), tmp);
}
+
+ /* Program DPHY clock lanes timings */
+ for_each_dsi_port(port, intel_dsi->ports) {
+ I915_WRITE(DPHY_CLK_TIMING_PARAM(port), intel_dsi->dphy_reg);
+
+ /* shadow register inside display core */
+ I915_WRITE(DSI_CLK_TIMING_PARAM(port), intel_dsi->dphy_reg);
+ }
+
+ /* Program DPHY data lanes timings */
+ for_each_dsi_port(port, intel_dsi->ports) {
+ I915_WRITE(DPHY_DATA_TIMING_PARAM(port),
+ intel_dsi->dphy_data_lane_reg);
+
+ /* shadow register inside display core */
+ I915_WRITE(DSI_DATA_TIMING_PARAM(port),
+ intel_dsi->dphy_data_lane_reg);
+ }
}
static void gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder)
diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
index 7afeb95..12a8154 100644
--- a/drivers/gpu/drm/i915/intel_dsi.h
+++ b/drivers/gpu/drm/i915/intel_dsi.h
@@ -85,6 +85,9 @@ struct intel_dsi {
u32 port_bits;
u32 bw_timer;
u32 dphy_reg;
+
+ /* data lanes dphy timing */
+ u32 dphy_data_lane_reg;
u32 video_frmt_cfg_bits;
u16 lp_byte_clk;
diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c b/drivers/gpu/drm/i915/intel_dsi_vbt.c
index 4d6ffa7..5cc3dd0 100644
--- a/drivers/gpu/drm/i915/intel_dsi_vbt.c
+++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c
@@ -509,7 +509,9 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
u32 bpp;
u32 tlpx_ns, extra_byte_count, bitrate, tlpx_ui;
u32 ui_num, ui_den;
- u32 prepare_cnt, exit_zero_cnt, clk_zero_cnt, trail_cnt;
+ u32 prepare_cnt, exit_zero_cnt, clk_zero_cnt, trail_cnt, hs_zero_cnt;
+ u32 tclk_pre_cnt, tclk_post_cnt;
+ u32 tclk_pre_ns, tclk_post_ns;
u32 ths_prepare_ns, tclk_trail_ns;
u32 tclk_prepare_clkzero, ths_prepare_hszero;
u32 lp_to_hs_switch, hs_to_lp_switch;
@@ -624,76 +626,157 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
tclk_prepare_clkzero = mipi_config->tclk_prepare_clkzero;
ths_prepare_hszero = mipi_config->ths_prepare_hszero;
-
+ tclk_trail_ns = max(mipi_config->tclk_trail, mipi_config->ths_trail);
+ ths_prepare_ns = max(mipi_config->ths_prepare,
+ mipi_config->tclk_prepare);
/*
* B060
* LP byte clock = TLPX/ (8UI)
*/
intel_dsi->lp_byte_clk = DIV_ROUND_UP(tlpx_ns * ui_den, 8 * ui_num);
- /* DDR clock period = 2 * UI
- * UI(sec) = 1/(bitrate * 10^3) (bitrate is in KHZ)
- * UI(nsec) = 10^6 / bitrate
- * DDR clock period (nsec) = 2 * UI = (2 * 10^6)/ bitrate
- * DDR clock count = ns_value / DDR clock period
- *
+ /*
* For GEMINILAKE dphy_param_reg will be programmed in terms of
* HS byte clock count for other platform in HS ddr clock count
*/
mul = IS_GEMINILAKE(dev_priv) ? 8 : 2;
- ths_prepare_ns = max(mipi_config->ths_prepare,
- mipi_config->tclk_prepare);
- /* prepare count */
- prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * ui_den, ui_num * mul);
+ if (IS_ICELAKE(dev_priv)) {
+ /*
+ * prepare cnt in escape clocks
+ * this field represents a hexadecimal value with a precision
+ * of 1.2 – i.e. the most significant bit is the integer
+ * and the least significant 2 bits are fraction bits.
+ * so, the field can represent a range of 0.25 to 1.75
+ */
+ prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * 4, tlpx_ns);
+
+ /* clk zero count in escape clocks */
+ clk_zero_cnt = DIV_ROUND_UP(
+ (tclk_prepare_clkzero - ths_prepare_ns),
+ tlpx_ns);
+
+ /* trail cnt in escape clocks*/
+ trail_cnt = DIV_ROUND_UP(tclk_trail_ns, tlpx_ns);
+
+ /* tclk pre/post count in escape clocks */
+ tclk_post_ns = mipi_config->tclk_post;
+ tclk_pre_ns = mipi_config->tclk_pre;
+ tclk_pre_cnt = DIV_ROUND_UP(tclk_pre_ns, tlpx_ns);
+ tclk_post_cnt = DIV_ROUND_UP(tclk_post_ns, tlpx_ns);
+
+ /* hs zero cnt in escape clocks */
+ hs_zero_cnt = DIV_ROUND_UP(
+ (ths_prepare_hszero - ths_prepare_ns),
+ tlpx_ns);
+
+ /* hs exit zero cnt in escape clocks */
+ exit_zero_cnt = DIV_ROUND_UP(mipi_config->ths_exit, tlpx_ns);
+
+ if (prepare_cnt > 0x7 ||
+ clk_zero_cnt > 0xF ||
+ tclk_pre_cnt > 0x3 ||
+ tclk_post_cnt > 0x7 ||
+ trail_cnt > 0x7 ||
+ hs_zero_cnt > 0xF ||
+ exit_zero_cnt > 0x7) {
+ DRM_DEBUG_DRIVER("DPHY values crossing max limits,");
+ DRM_DEBUG_DRIVER("restricting to max values\n");
+ }
+
+ prepare_cnt = (prepare_cnt > 0x7) ? 0x7 : prepare_cnt;
+ clk_zero_cnt = (clk_zero_cnt > 0xF) ? 0xF : clk_zero_cnt;
+ tclk_pre_cnt = (tclk_pre_cnt > 0x3) ? 0x3 : tclk_pre_cnt;
+ tclk_post_cnt = (tclk_post_cnt > 0x7) ? 0x7 : tclk_post_cnt;
+ trail_cnt = (trail_cnt > 0x7) ? 0x7 : trail_cnt;
+ hs_zero_cnt = (hs_zero_cnt > 0xF) ? 0xF : hs_zero_cnt;
+ exit_zero_cnt = (exit_zero_cnt > 0x7) ? 0x7 : exit_zero_cnt;
+
+ /* clock lane dphy timings */
+ intel_dsi->dphy_reg |= (CLK_PREP_OVERRIDE |
+ CLK_PREP_TIME(prepare_cnt) |
+ CLK_ZERO_OVERRIDE |
+ CLK_ZERO_TIME(clk_zero_cnt) |
+ CLK_PRE_OVERRIDE |
+ CLK_PRE_TIME(tclk_pre_cnt) |
+ CLK_POST_OVERRIDE |
+ CLK_POST_TIME(tclk_post_cnt) |
+ CLK_TRAIL_OVERRIDE |
+ CLK_TRAIL_TIME(trail_cnt));
+
+ /* data lanes dphy timings */
+ intel_dsi->dphy_data_lane_reg = HS_PREP_OVERRIDE |
+ HS_PREP_TIME(prepare_cnt) |
+ HS_ZERO_OVERRIDE |
+ HS_ZERO_TIME(hs_zero_cnt) |
+ HS_TRAIL_OVERRIDE |
+ HS_TRAIL_TIME(trail_cnt) |
+ HS_EXIT_OVERRIDE |
+ HS_EXIT_TIME(exit_zero_cnt);
+ } else {
+ /*
+ * DDR clock period = 2 * UI
+ * UI(sec) = 1/(bitrate * 10^3) (bitrate is in KHZ)
+ * UI(nsec) = 10^6 / bitrate
+ * DDR clock period (nsec) = 2 * UI = (2 * 10^6)/ bitrate
+ * DDR clock count = ns_value / DDR clock period
+ */
- if (prepare_cnt > PREPARE_CNT_MAX) {
- DRM_DEBUG_KMS("prepare count too high %u\n", prepare_cnt);
- prepare_cnt = PREPARE_CNT_MAX;
- }
+ /* prepare count */
+ prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * ui_den,
+ ui_num * mul);
- /* exit zero count */
- exit_zero_cnt = DIV_ROUND_UP(
+ if (prepare_cnt > PREPARE_CNT_MAX) {
+ DRM_DEBUG_KMS("prepare count too high %u\n",
+ prepare_cnt);
+ prepare_cnt = PREPARE_CNT_MAX;
+ }
+
+ /* exit zero count */
+ exit_zero_cnt = DIV_ROUND_UP(
(ths_prepare_hszero - ths_prepare_ns) * ui_den,
ui_num * mul
);
- /*
- * Exit zero is unified val ths_zero and ths_exit
- * minimum value for ths_exit = 110ns
- * min (exit_zero_cnt * 2) = 110/UI
- * exit_zero_cnt = 55/UI
- */
- 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) {
- DRM_DEBUG_KMS("exit zero count too high %u\n", exit_zero_cnt);
- exit_zero_cnt = EXIT_ZERO_CNT_MAX;
- }
+ /*
+ * Exit zero is unified val ths_zero and ths_exit
+ * minimum value for ths_exit = 110ns
+ * min (exit_zero_cnt * 2) = 110/UI
+ * exit_zero_cnt = 55/UI
+ */
+ 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) {
+ DRM_DEBUG_KMS("exit zero count too high %u\n",
+ exit_zero_cnt);
+ exit_zero_cnt = EXIT_ZERO_CNT_MAX;
+ }
- /* clk zero count */
- clk_zero_cnt = DIV_ROUND_UP(
- (tclk_prepare_clkzero - ths_prepare_ns)
- * ui_den, ui_num * mul);
+ /* clk zero count */
+ clk_zero_cnt = DIV_ROUND_UP((tclk_prepare_clkzero -
+ ths_prepare_ns)
+ * ui_den, ui_num * mul);
- if (clk_zero_cnt > CLK_ZERO_CNT_MAX) {
- DRM_DEBUG_KMS("clock zero count too high %u\n", clk_zero_cnt);
- clk_zero_cnt = CLK_ZERO_CNT_MAX;
- }
+ if (clk_zero_cnt > CLK_ZERO_CNT_MAX) {
+ DRM_DEBUG_KMS("clock zero count too high %u\n",
+ clk_zero_cnt);
+ clk_zero_cnt = CLK_ZERO_CNT_MAX;
+ }
- /* 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);
+ /* trail cnt */
+ trail_cnt = DIV_ROUND_UP(tclk_trail_ns * ui_den, ui_num * mul);
- if (trail_cnt > TRAIL_CNT_MAX) {
- DRM_DEBUG_KMS("trail count too high %u\n", trail_cnt);
- trail_cnt = TRAIL_CNT_MAX;
- }
+ if (trail_cnt > TRAIL_CNT_MAX) {
+ DRM_DEBUG_KMS("trail count too high %u\n", trail_cnt);
+ trail_cnt = TRAIL_CNT_MAX;
+ }
- /* B080 */
- intel_dsi->dphy_reg = exit_zero_cnt << 24 | trail_cnt << 16 |
+ /* B080 */
+ intel_dsi->dphy_reg = exit_zero_cnt << 24 | trail_cnt << 16 |
clk_zero_cnt << 8 | prepare_cnt;
+ }
/*
* LP to HS switch count = 4TLPX + PREP_COUNT * mul + EXIT_ZERO_COUNT *
@@ -707,9 +790,10 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
*/
tlpx_ui = DIV_ROUND_UP(tlpx_ns * ui_den, ui_num);
- /* B044 */
- /* FIXME:
- * The comment above does not match with the code */
+ /*
+ * B044
+ * FIXME: comment above does not match with the code
+ */
lp_to_hs_switch = DIV_ROUND_UP(4 * tlpx_ui + prepare_cnt * mul +
exit_zero_cnt * mul + 10, 8);
@@ -718,8 +802,9 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
intel_dsi->hs_to_lp_count = max(lp_to_hs_switch, hs_to_lp_switch);
intel_dsi->hs_to_lp_count += extra_byte_count;
- /* B088 */
- /* LP -> HS for clock lanes
+ /*
+ * B088
+ * LP -> HS for clock lanes
* LP clk sync + LP11 + LP01 + tclk_prepare + tclk_zero +
* extra byte count
* 2TPLX + 1TLPX + 1 TPLX(in ns) + prepare_cnt * 2 + clk_zero_cnt *
@@ -735,7 +820,8 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
intel_dsi->clk_lp_to_hs_count += extra_byte_count;
- /* HS->LP for Clock Lanes
+ /*
+ * HS->LP for Clock Lanes
* Low Power clock synchronisations + 1Tx byteclk + tclk_trail +
* Extra byte count
* 2TLPX + 8UI + (trail_count*2)(in UI) + Extra byte count
@@ -782,9 +868,11 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
DRM_DEBUG_KMS("BTA %s\n",
enableddisabled(!(intel_dsi->video_frmt_cfg_bits & DISABLE_VIDEO_BTA)));
- /* delays in VBT are in unit of 100us, so need to convert
+ /*
+ * delays in VBT are in unit of 100us, so need to convert
* here in ms
- * Delay (100us) * 100 /1000 = Delay / 10 (ms) */
+ * Delay (100us) * 100 /1000 = Delay / 10 (ms)
+ */
intel_dsi->backlight_off_delay = pps->bl_disable_delay / 10;
intel_dsi->backlight_on_delay = pps->bl_enable_delay / 10;
intel_dsi->panel_on_delay = pps->panel_on_delay / 10;
--
2.7.4
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