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drm/i915/dsi: let HW maintain CLK_POST

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This change is to adjust TCLK-POST timing so DSI signaling can
meet CTS specification.

For clock lane, the TCLK-POST timing may be changed from
133.44 ns to 178.72 ns, which is greater than (60 ns+52*UI)
and is conformed to the CTS standard.

The computed UI is around 1.47 ns.

v2: remove the change of HS-TRAIL.

Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Vandita Kulkarni <vandita.kulkarni@intel.com>
Cc: Suraj Kandpal <suraj.kandpal@intel.com>
Cc: Lee Shawn C <shawn.c.lee@intel.com>
Signed-off-by: William Tseng <william.tseng@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230914095137.4132029-1-william.tseng@intel.com
This commit is contained in:
William Tseng 2023-09-14 17:51:37 +08:00 committed by Jani Nikula
parent e356289680
commit fc3bbd5760
1 changed files with 1 additions and 12 deletions
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13
drivers/gpu/drm/i915/display/icl_dsi.c
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@ -1822,7 +1822,7 @@ static void icl_dphy_param_init(struct intel_dsi *intel_dsi)
u32 prepare_cnt, exit_zero_cnt, clk_zero_cnt, trail_cnt;
u32 ths_prepare_ns, tclk_trail_ns;
u32 hs_zero_cnt;
u32 tclk_pre_cnt, tclk_post_cnt;
u32 tclk_pre_cnt;
tlpx_ns = intel_dsi_tlpx_ns(intel_dsi);
@ -1869,15 +1869,6 @@ static void icl_dphy_param_init(struct intel_dsi *intel_dsi)
tclk_pre_cnt = ICL_TCLK_PRE_CNT_MAX;
}
/* tclk post count in escape clocks */
tclk_post_cnt = DIV_ROUND_UP(mipi_config->tclk_post, tlpx_ns);
if (tclk_post_cnt > ICL_TCLK_POST_CNT_MAX) {
drm_dbg_kms(&dev_priv->drm,
"tclk_post_cnt out of range (%d)\n",
tclk_post_cnt);
tclk_post_cnt = ICL_TCLK_POST_CNT_MAX;
}
/* hs zero cnt in escape clocks */
hs_zero_cnt = DIV_ROUND_UP(mipi_config->ths_prepare_hszero -
ths_prepare_ns, tlpx_ns);
@ -1903,8 +1894,6 @@ static void icl_dphy_param_init(struct intel_dsi *intel_dsi)
CLK_ZERO(clk_zero_cnt) |
CLK_PRE_OVERRIDE |
CLK_PRE(tclk_pre_cnt) |
CLK_POST_OVERRIDE |
CLK_POST(tclk_post_cnt) |
CLK_TRAIL_OVERRIDE |
CLK_TRAIL(trail_cnt));