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boundary="===============8322177200789560377==" Sender: "Linux-rockchip" Errors-To: linux-rockchip-bounces+linux-rockchip=archiver.kernel.org@lists.infradead.org --===============8322177200789560377== Content-Type: multipart/signed; micalg=pgp-sha384; protocol="application/pgp-signature"; boundary="wrzxqzphrlcany36" Content-Disposition: inline --wrzxqzphrlcany36 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Sat, Aug 31, 2024 at 01:21:48AM GMT, Cristian Ciocaltea wrote: > On 8/27/24 11:58 AM, Maxime Ripard wrote: > > On Mon, Aug 19, 2024 at 01:29:29AM GMT, Cristian Ciocaltea wrote: > >> +static irqreturn_t dw_hdmi_qp_main_hardirq(int irq, void *dev_id) > >> +{ > >> + struct dw_hdmi_qp *hdmi =3D dev_id; > >> + struct dw_hdmi_qp_i2c *i2c =3D hdmi->i2c; > >> + u32 stat; > >> + > >> + stat =3D dw_hdmi_qp_read(hdmi, MAINUNIT_1_INT_STATUS); > >> + > >> + i2c->stat =3D stat & (I2CM_OP_DONE_IRQ | I2CM_READ_REQUEST_IRQ | > >> + I2CM_NACK_RCVD_IRQ); > >> + > >> + if (i2c->stat) { > >> + dw_hdmi_qp_write(hdmi, i2c->stat, MAINUNIT_1_INT_CLEAR); > >> + complete(&i2c->cmp); > >> + } > >> + > >> + if (stat) > >> + return IRQ_HANDLED; > >> + > >> + return IRQ_NONE; > >> +} > >=20 > > If the scrambler is enabled, you need to deal with hotplug. On hotplug, > > the monitor will drop its TMDS ratio and scrambling status, but the > > driver will keep assuming it's been programmed. > >=20 > > If you don't have a way to deal with hotplug yet, then I'd suggest to > > just drop the scrambler setup for now. >=20 > Thanks for the heads up! >=20 > HPD is partially handled by the RK platform driver, which makes use of > drm_helper_hpd_irq_event(). Since the bridge sets DRM_BRIDGE_OP_DETECT > flag, the dw_hdmi_qp_bridge_detect() callback gets executed, which in turn > verifies the PHY status via ->read_hpd() implemented as > dw_hdmi_qp_rk3588_read_hpd() in the platform driver. It's not only about hotplug detection, it's also about what happens after you've detected a disconnection / reconnection. The framework expects to keep the current mode as is, despite the monitor not being setup to use the scrambler anymore, and the display remains black. > During my testing so far it worked reliably when switching displays with > different capabilities. I don't have a 4K@60Hz display at the moment, but > used the HDMI RX port on the Rock 5B board in a loopback connection to > verify this mode, which triggered the high TMDS clock ratio and scrambling > setup as well. How did you test exactly? Maxime --wrzxqzphrlcany36 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJUEABMJAB0WIQTkHFbLp4ejekA/qfgnX84Zoj2+dgUCZtVrDQAKCRAnX84Zoj2+ diimAYCLSBf4aL43PYdfrLmm+dcjJ3Ntv61sabKRj+I99ElR2CzjU5X15XDJRhy4 7DlHP7QBgJDvJLEChcXiPKKmoMdbojebpow32S+1IQz8IIJ1A/mVwiVMhhX/9dGS l6pDQRfQtw== =s4gD -----END PGP SIGNATURE----- --wrzxqzphrlcany36-- --===============8322177200789560377== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Linux-rockchip mailing list Linux-rockchip@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-rockchip --===============8322177200789560377==--