From 295a0d0b55269fce2290a7aebfcc8c2525866c33 Mon Sep 17 00:00:00 2001 From: Xiong Zhang Date: Tue, 20 Jun 2017 11:37:22 +0800 Subject: [PATCH] drm/i915/gvt: Set initial PORT_CLK_SEL vreg for BDW On BDW, when host physical screen and guest virtual screen aren't on the same DDI port, guest i915 driver prints the following error and stop running. [ 6.775873] BUG: unable to handle kernel NULL pointer dereference at 0000000000000068 [ 6.775928] IP: intel_ddi_clock_get+0x81/0x430 [i915] [ 6.776206] Call Trace: [ 6.776233] ? vgpu_read32+0x4f/0x100 [i915] [ 6.776264] intel_ddi_get_config+0x11c/0x230 [i915] [ 6.776298] intel_modeset_setup_hw_state+0x313/0xd40 [i915] [ 6.776334] intel_modeset_init+0xe49/0x18d0 [i915] [ 6.776368] ? vgpu_write32+0x53/0x100 [i915] [ 6.776731] ? intel_i2c_reset+0x42/0x50 [i915] [ 6.777085] ? intel_setup_gmbus+0x32a/0x350 [i915] [ 6.777427] i915_driver_load+0xabc/0x14d0 [i915] [ 6.777768] i915_pci_probe+0x4f/0x70 [i915] The null pointer is guest intel_crtc_state->shared_dpll which is setted in haswell_get_ddi_pll(). When guest and host screen are on different DDI port, host driver won't set PORT_CLK_SET(guest_port), so haswell_get_ddi_pll() will return null and don't set pipe_config->shared_dpll, once the following program refernce this structure, it will print the above error. This patch set the initial val of guest PORT_CLK_SEL(guest_port) to LCPLL_810. And guest i915 driver will reset this value according to guest screen mode. Signed-off-by: Xiong Zhang Signed-off-by: Zhenyu Wang --- drivers/gpu/drm/i915/gvt/display.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/drivers/gpu/drm/i915/gvt/display.c b/drivers/gpu/drm/i915/gvt/display.c index e0261fcc5b50..818e94907c3b 100644 --- a/drivers/gpu/drm/i915/gvt/display.c +++ b/drivers/gpu/drm/i915/gvt/display.c @@ -197,6 +197,12 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu) (TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST | (PORT_B << TRANS_DDI_PORT_SHIFT) | TRANS_DDI_FUNC_ENABLE); + if (IS_BROADWELL(dev_priv)) { + vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_B)) &= + ~PORT_CLK_SEL_MASK; + vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_B)) |= + PORT_CLK_SEL_LCPLL_810; + } vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_B)) |= DDI_BUF_CTL_ENABLE; vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_B)) &= ~DDI_BUF_IS_IDLE; vgpu_vreg(vgpu, SDEISR) |= SDE_PORTB_HOTPLUG_CPT; @@ -211,6 +217,12 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu) (TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST | (PORT_C << TRANS_DDI_PORT_SHIFT) | TRANS_DDI_FUNC_ENABLE); + if (IS_BROADWELL(dev_priv)) { + vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_C)) &= + ~PORT_CLK_SEL_MASK; + vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_C)) |= + PORT_CLK_SEL_LCPLL_810; + } vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_C)) |= DDI_BUF_CTL_ENABLE; vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_C)) &= ~DDI_BUF_IS_IDLE; vgpu_vreg(vgpu, SFUSE_STRAP) |= SFUSE_STRAP_DDIC_DETECTED; @@ -225,6 +237,12 @@ static void emulate_monitor_status_change(struct intel_vgpu *vgpu) (TRANS_DDI_BPC_8 | TRANS_DDI_MODE_SELECT_DP_SST | (PORT_D << TRANS_DDI_PORT_SHIFT) | TRANS_DDI_FUNC_ENABLE); + if (IS_BROADWELL(dev_priv)) { + vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_D)) &= + ~PORT_CLK_SEL_MASK; + vgpu_vreg(vgpu, PORT_CLK_SEL(PORT_D)) |= + PORT_CLK_SEL_LCPLL_810; + } vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_D)) |= DDI_BUF_CTL_ENABLE; vgpu_vreg(vgpu, DDI_BUF_CTL(PORT_D)) &= ~DDI_BUF_IS_IDLE; vgpu_vreg(vgpu, SFUSE_STRAP) |= SFUSE_STRAP_DDID_DETECTED; -- 2.30.2