From 14f5ba26aa7060b4cad9c4c288b9a785bd0cd1a8 Mon Sep 17 00:00:00 2001 From: Xu Han Date: Tue, 21 Mar 2017 10:00:59 +0800 Subject: [PATCH] drm/i915/gvt: Fix guest fail to read EDID leading to black guest console issue. MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit It appears missing slaves on the i2c should cause 0xff to be returned rather than 0. So, when the Windows driver tried to address a slave at 0x40 and got 0’s back rather than 0xff’s it must have confused it. Signed-off-by: Paul Durrant Signed-off-by: Xu Han Signed-off-by: Zhenyu Wang --- drivers/gpu/drm/i915/gvt/edid.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/gvt/edid.c b/drivers/gpu/drm/i915/gvt/edid.c index f1648fe5e5ea..42cd09ec63fa 100644 --- a/drivers/gpu/drm/i915/gvt/edid.c +++ b/drivers/gpu/drm/i915/gvt/edid.c @@ -495,7 +495,8 @@ void intel_gvt_i2c_handle_aux_ch_write(struct intel_vgpu *vgpu, unsigned char val = edid_get_byte(vgpu); aux_data_for_write = (val << 16); - } + } else + aux_data_for_write = (0xff << 16); } /* write the return value in AUX_CH_DATA reg which includes: * ACK of I2C_WRITE -- 2.39.5