drm/nv30: Workaround dual TMDS brain damage. (2d14e35c) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/gpu/drm/nouveau/nv04_dfp.c

+35 −4

Original line number	Diff line number	Diff line
		@@ -146,6 +146,36 @@ void nv04_dfp_update_fp_control(struct drm_encoder *encoder, int mode)
		}
		}

		static struct drm_encoder get_tmds_slave(struct drm_encoder encoder)
		{
		struct drm_device *dev = encoder->dev;
		struct dcb_entry *dcb = nouveau_encoder(encoder)->dcb;
		struct drm_encoder *slave;

		if (dcb->type != OUTPUT_TMDS \|\| dcb->location == DCB_LOC_ON_CHIP)
		return NULL;

		/* Some BIOSes (e.g. the one in a Quadro FX1000) report several
		* TMDS transmitters at the same I2C address, in the same I2C
		* bus. This can still work because in that case one of them is
		* always hard-wired to a reasonable configuration using straps,
		* and the other one needs to be programmed.
		*
		* I don't think there's a way to know which is which, even the
		* blob programs the one exposed via I2C for both heads, so
		* let's do the same.
		*/
		list_for_each_entry(slave, &dev->mode_config.encoder_list, head) {
		struct dcb_entry *slave_dcb = nouveau_encoder(slave)->dcb;

		if (slave_dcb->type == OUTPUT_TMDS && get_slave_funcs(slave) &&
		slave_dcb->tmdsconf.slave_addr == dcb->tmdsconf.slave_addr)
		return slave;
		}

		return NULL;
		}

		static bool nv04_dfp_mode_fixup(struct drm_encoder *encoder,
		struct drm_display_mode *mode,
		struct drm_display_mode *adjusted_mode)
		@@ -432,9 +462,9 @@ static void nv04_dfp_commit(struct drm_encoder *encoder)
		NVWriteRAMDAC(dev, 0, NV_PRAMDAC_TEST_CONTROL + nv04_dac_output_offset(encoder), 0x00100000);

		/* Init external transmitters */
		if (get_slave_funcs(encoder))
		get_slave_funcs(encoder)->mode_set(encoder, &nv_encoder->mode,
		&nv_encoder->mode);
		if (get_tmds_slave(encoder))
		get_slave_funcs(get_tmds_slave(encoder))->mode_set(
		encoder, &nv_encoder->mode, &nv_encoder->mode);

		helper->dpms(encoder, DRM_MODE_DPMS_ON);

		@@ -581,7 +611,8 @@ static void nv04_tmds_slave_init(struct drm_encoder *encoder)
		};
		int type;

		if (!nv_gf4_disp_arch(dev) \|\| !i2c)
		if (!nv_gf4_disp_arch(dev) \|\| !i2c \|\|
		get_tmds_slave(encoder))
		return;

		type = nouveau_i2c_identify(dev, "TMDS transmitter", info, 2);