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david rice
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reports/20260420_074657_interactive.html
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reports/20260420_074657_interactive.html
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>MIPI Interactive Flicker Test — 2026-04-20 07:46:57</title>
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<style>
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body { font-family: Arial, sans-serif; max-width: 1020px; margin: 40px auto;
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padding: 0 20px; color: #222; }
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h1 { color: #1a3a5c; border-bottom: 2px solid #1a3a5c; padding-bottom: 8px; }
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h2 { color: #1a3a5c; margin-top: 32px; }
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h3 { color: #333; }
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.meta { color: #555; font-size: 0.92em; margin-top: -6px; margin-bottom: 20px; }
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.stop-box { background: #e8f4fd; border-left: 4px solid #1a3a5c;
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padding: 10px 16px; margin: 16px 0 24px; border-radius: 3px; }
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.stat { display: inline-block; margin: 0 16px 20px 0; padding: 12px 22px;
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border-radius: 6px; font-size: 1.05em; font-weight: bold; }
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.s-confirmed { background: #fdecea; border: 2px solid #c62828; color: #c62828; }
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.s-false { background: #e8f5e9; border: 2px solid #2e7d32; color: #2e7d32; }
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.s-claude-no { background: #fff8e1; border: 2px solid #f9a825; color: #795548; }
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table { border-collapse: collapse; width: 100%; margin-top: 8px; }
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th { background: #1a3a5c; color: white; padding: 7px 10px; text-align: left; }
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td { border: 1px solid #ddd; padding: 5px 10px; }
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tr:nth-child(even) { background: #fafafa; }
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pre { margin: 0; }
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</style>
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</head>
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<body>
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<h1>MIPI Interactive Flicker Test Report</h1>
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<p class="meta">
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Generated: 2026-04-20 07:46:57 |
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Model: claude-opus-4-6
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</p>
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<div class="stop-box">
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<strong>Stop reason:</strong> Test interrupted by operator (Ctrl+C)
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</div>
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<div>
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<div class="stat s-confirmed">0 confirmed flicker(s)</div>
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<div class="stat s-false">2 false alarm(s)</div>
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<div class="stat s-claude-no">0 Claude said no</div>
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</div>
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<h2>D-PHY Configuration</h2>
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<p>
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Pixel clock: <strong>72.0 MHz</strong> |
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Bit rate: <strong>432.0 Mbit/s per lane</strong> |
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Byte clock: <strong>54.000 MHz</strong>
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(18.519 ns/byte) |
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UI: <strong>2.315 ns</strong>
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</p>
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<table>
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<tr>
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<th>Field</th><th>Spec (ns)</th><th>Rnd Best</th><th>Rnd Up</th>
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<th>Extra</th><th>Final</th><th>Actual (ns)</th><th>Status</th>
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</tr>
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<tr><td><code>lpx</code></td><td>≥ 50.0</td><td>3</td><td>3</td><td>+0</td><td><strong>3</strong></td><td>55.56</td><td>✓</td></tr>
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<tr><td><code>hs_prepare</code></td><td>49.3 – 98.9</td><td>3</td><td>3</td><td>+1</td><td><strong>4</strong></td><td>74.07</td><td>✓</td></tr>
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<tr><td><code>hs_zero</code></td><td>≥ 94.1</td><td>5</td><td>6</td><td>+0</td><td><strong>6</strong></td><td>111.11</td><td>✓</td></tr>
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<tr><td><code>hs_trail</code></td><td>≥ 69.3</td><td>4</td><td>4</td><td>+1</td><td><strong>5</strong></td><td>92.59</td><td>✓</td></tr>
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<tr><td><code>hs_exit</code></td><td>≥ 100.0</td><td>5</td><td>6</td><td>+0</td><td><strong>6</strong></td><td>111.11</td><td>✓</td></tr>
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<tr><td><code>clk_prepare</code></td><td>38.0 – 95.0</td><td>2</td><td>3</td><td>+0</td><td><strong>3</strong></td><td>55.56</td><td>✓</td></tr>
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<tr><td><code>clk_zero</code></td><td>≥ 244.4</td><td>13</td><td>14</td><td>+3</td><td><strong>17</strong></td><td>314.81</td><td>✓</td></tr>
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<tr><td><code>clk_post</code></td><td>≥ 180.4</td><td>10</td><td>10</td><td>+0</td><td><strong>10</strong></td><td>185.19</td><td>✓</td></tr>
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<tr><td><code>clk_trail</code></td><td>≥ 60.0</td><td>3</td><td>4</td><td>+0</td><td><strong>4</strong></td><td>74.07</td><td>✓</td></tr>
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</table>
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<p style="color:#2e7d32">✓ All D-PHY v1.1 Table 14 constraints satisfied.</p>
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<h3>Samsung DSIM Registers</h3>
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<table>
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<tr><th>Register</th><th>Address</th><th>Value</th><th>Field breakdown</th></tr>
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<tr>
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<td>PHY_TIMING</td><td><code>0xb4</code></td>
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<td><code>0x00000306</code></td>
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<td>lpx=3 hs_exit=6</td>
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</tr>
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<tr>
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<td>PHY_TIMING1</td><td><code>0xb8</code></td>
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<td><code>0x03110a04</code></td>
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<td>clk_prepare=3 clk_zero=17
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clk_post=10 clk_trail=4</td>
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</tr>
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<tr>
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<td>PHY_TIMING2</td><td><code>0xbc</code></td>
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<td><code>0x00040605</code></td>
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<td>hs_prepare=4 hs_zero=6
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hs_trail=5</td>
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</tr>
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</table>
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<h3>u-boot Commands</h3>
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<pre style="background:#f5f5f5;padding:12px;border-radius:4px;
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white-space:pre-wrap;font-size:0.88em"># D-PHY PHY timing registers (pixel clock 72.0 MHz, 432.0 Mbit/s, byte clock 54.000 MHz)
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#
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# PHY_TIMING (0xb4) = 0x00000306 lpx=3 hs_exit=6
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# PHY_TIMING1 (0xb8) = 0x03110a04 clk_prepare=3 clk_zero=17 clk_post=10 clk_trail=4
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# PHY_TIMING2 (0xbc) = 0x00040605 hs_prepare=4 hs_zero=6 hs_trail=5
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# Enable Round-Up rounding (dsi-tweak bit 2)
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setenv flb_dtovar "${flb_dtovar} dsi-tweak=4"
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# Extra PHY cycles above Round-Up minimum
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setenv flb_dtovar "${flb_dtovar} dsi-phy-extra-hs-prepare=1"
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setenv flb_dtovar "${flb_dtovar} dsi-phy-extra-hs-trail=1"
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setenv flb_dtovar "${flb_dtovar} dsi-phy-extra-clk-zero=3"
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saveenv
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boot</pre>
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<h2>Event Log</h2>
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<table>
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<tr>
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<th>Capture</th><th>Timestamp</th><th>Channel</th>
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<th>LP-low plateau</th><th>LP exit→HS</th><th>LP-11 voltage</th>
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<th>Claude: flicker?</th><th>Outcome</th>
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</tr>
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<tr><td>0002</td><td>20260420_074452</td><td>dat</td><td>107.8 ns</td><td>3.1 ns</td><td>1.017 V</td><td>YES</td><td><span style="color:#2e7d32;font-weight:bold">✓ FALSE ALARM</span></td></tr><tr><td>0004</td><td>20260420_074554</td><td>dat</td><td>107.4 ns</td><td>1.2 ns</td><td>1.016 V</td><td>YES</td><td><span style="color:#2e7d32;font-weight:bold">✓ FALSE ALARM</span></td></tr>
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</table>
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<h2>Claude Assessments</h2><h3>Capture 0002 [20260420_074452] — FALSE ALARM</h3><pre style="background:#f5f5f5;padding:12px;border-radius:4px;white-space:pre-wrap;font-size:0.88em">YES
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The LP-low plateau at ~108 ns exceeds the 50 ns minimum, but the critical failure here is the **LP exit → HS transition of only 3 ns**, far below the 50 ns specification minimum. This means the LP-01 and LP-00 states that constitute the SoT preamble are essentially absent or too brief for the SN65DSI83 to reliably detect. Additionally, the **HS amplitude of 30 mV** is well below the normal 105–122 mV range and falls under the 50 mV "absent" threshold, indicating the bridge likely never locked onto the HS data. Together, the collapsed LP-exit timing and effectively absent HS signaling strongly indicate a missed SoT event that would produce visible flicker.</pre><h3>Capture 0004 [20260420_074554] — FALSE ALARM</h3><pre style="background:#f5f5f5;padding:12px;border-radius:4px;white-space:pre-wrap;font-size:0.88em">YES
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The HS amplitude of only 32 mV (well below the 50 mV "absent" threshold and far from the normal 105–122 mV range) indicates the HS data burst was essentially not received by the SN65DSI83, even though the LP-low plateau at 107 ns nominally meets the ≥50 ns requirement. Critically, the LP exit → HS transition time of only 1 ns (spec ≥50 ns) means the LP-01/LP-00 states were not properly held long enough for the bridge to recognize the SoT preamble — the pre-processor itself flagged this as below spec. The combination of a collapsed LP-exit duration and an effectively absent HS swing strongly indicates the bridge missed start-of-transmission on this frame, which would produce visible flicker.</pre>
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</body>
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</html>
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