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<div>On Wed, 2024-04-03 at 16:56 +0200, Krzysztof Kozlowski wrote:</div>
<div>Dear Krzysztof:</div>
<div><br>
</div>
The dp_phy device has already been registered through the mtk_dp_register_phy function in the mtk_dp.c file,
<div>so it cannot be redefined in the dts. Avoid using of_get_child_by_name for this purpose.</div>
<div><br>
</div>
<div> To find the node name, utilize of_find_node_by_name since it has already been registered.</div>
<div><br>
</div>
<div>Best regards,</div>
<div>Liankun Yang</div>
<br>
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<pre>On 03/04/2024 08:41, Krzysztof Kozlowski wrote:</pre>
<pre>> On 03/04/2024 06:05, Liankun Yang wrote:</pre>
<pre>>> [Description]</pre>
<pre>>> Severe screen flickering has been observed on the external display</pre>
<pre>>> when the DP projection function is used with the market expansion dock.</pre>
<pre>>></pre>
<pre>> </pre>
<pre>>> +if (!strcmp(mode_name, RG_XTP_GLB_TXPLL_SSC_DELTA_RBR)) {</pre>
<pre>>> +regmap_update_bits(dp_phy->regs, ssc_reg_offset,</pre>
<pre>>> + XTP_GLB_TXPLL_SSC_DELTA_RBR_DEFAULT, read_value);</pre>
<pre>>> +} else if (!strcmp(mode_name, RG_XTP_GLB_TXPLL_SSC_DELTA_HBR)) {</pre>
<pre>>> +read_value = read_value << 16 | 0x0000;</pre>
<pre>>> +regmap_update_bits(dp_phy->regs, ssc_reg_offset,</pre>
<pre>>> + XTP_GLB_TXPLL_SSC_DELTA_HBR_DEFAULT, read_value);</pre>
<pre>>> +}</pre>
<pre>>> +</pre>
<pre>>> +return 0;</pre>
<pre>>> +}</pre>
<pre>>> +</pre>
<pre>>> +static struct device_node *mtk_dp_get_ssc_node(struct phy *phy, struct mtk_dp_phy *dp_phy)</pre>
<pre>>> +{</pre>
<pre>>> +struct device_node *mode_node = NULL;</pre>
<pre>>> +</pre>
<pre>>> +mode_node = of_find_node_by_name(dp_phy->dev->of_node, SSC_SETTING);</pre>
<pre>> </pre>
<pre>> ?!?!</pre>
<pre>> You have the node, why do you try to find it?</pre>
<pre>> </pre>
<pre><br></pre>
<pre>Wait, that was brainfuck from my side or -ENOCOFFEE. Ignore.</pre>
<pre><br></pre>
<pre>I still have a question though, where did you document new ABI:</pre>
<pre>dependency on the node name here?</pre>
<pre><br></pre>
<pre>Also, why you are not going through direct children -</pre>
<pre>of_get_child_by_name()?</pre>
<pre><br></pre>
<pre>Best regards,</pre>
<pre>Krzysztof</pre>
<pre><br></pre>
<pre><br></pre>
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