From: Keith Packard <keithp@keithp.com> To: intel-gfx@lists.freedesktop.org, Daniel Vetter <daniel.vetter@ffwll.ch> Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, Keith Packard <keithp@keithp.com> Subject: [PATCH] drm/intel: Only smash VGA SR01 register if intel is default VGA device Date: Tue, 17 Dec 2013 09:12:10 -0800 [thread overview] Message-ID: <1387300330-8844-1-git-send-email-keithp@keithp.com> (raw) We want to disable the (unused) VGA plane on the intel hardware, which should be a simple matter of writing the vga control register. However, in 2009 (commit 24f119c769bacac5729297b682fec7811a983cc6), that simple code was changed to also smash the SR01 VGA register to fix "random crash and lockups". When running efifb on an nVidia card, executing this store to SR01 ends up causing the screen to go black. I'm not sure if this store is still required; this patch limits it to when the intel card is primary. Signed-off-by: Keith Packard <keithp@keithp.com> --- drivers/gpu/drm/i915/intel_display.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index c714d4d..545b271 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -9038,12 +9038,14 @@ static void i915_disable_vga(struct drm_device *dev) u8 sr1; u32 vga_reg = i915_vgacntrl_reg(dev); - vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO); - outb(SR01, VGA_SR_INDEX); - sr1 = inb(VGA_SR_DATA); - outb(sr1 | 1<<5, VGA_SR_DATA); - vga_put(dev->pdev, VGA_RSRC_LEGACY_IO); - udelay(300); + if (dev->pdev == vga_default_device()) { + vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO); + outb(SR01, VGA_SR_INDEX); + sr1 = inb(VGA_SR_DATA); + outb(sr1 | 1<<5, VGA_SR_DATA); + vga_put(dev->pdev, VGA_RSRC_LEGACY_IO); + udelay(300); + } I915_WRITE(vga_reg, VGA_DISP_DISABLE); POSTING_READ(vga_reg); -- 1.8.5.1
WARNING: multiple messages have this Message-ID (diff)
From: Keith Packard <keithp@keithp.com> To: intel-gfx@lists.freedesktop.org, Daniel Vetter <daniel.vetter@ffwll.ch> Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org Subject: [PATCH] drm/intel: Only smash VGA SR01 register if intel is default VGA device Date: Tue, 17 Dec 2013 09:12:10 -0800 [thread overview] Message-ID: <1387300330-8844-1-git-send-email-keithp@keithp.com> (raw) We want to disable the (unused) VGA plane on the intel hardware, which should be a simple matter of writing the vga control register. However, in 2009 (commit 24f119c769bacac5729297b682fec7811a983cc6), that simple code was changed to also smash the SR01 VGA register to fix "random crash and lockups". When running efifb on an nVidia card, executing this store to SR01 ends up causing the screen to go black. I'm not sure if this store is still required; this patch limits it to when the intel card is primary. Signed-off-by: Keith Packard <keithp@keithp.com> --- drivers/gpu/drm/i915/intel_display.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index c714d4d..545b271 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -9038,12 +9038,14 @@ static void i915_disable_vga(struct drm_device *dev) u8 sr1; u32 vga_reg = i915_vgacntrl_reg(dev); - vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO); - outb(SR01, VGA_SR_INDEX); - sr1 = inb(VGA_SR_DATA); - outb(sr1 | 1<<5, VGA_SR_DATA); - vga_put(dev->pdev, VGA_RSRC_LEGACY_IO); - udelay(300); + if (dev->pdev == vga_default_device()) { + vga_get_uninterruptible(dev->pdev, VGA_RSRC_LEGACY_IO); + outb(SR01, VGA_SR_INDEX); + sr1 = inb(VGA_SR_DATA); + outb(sr1 | 1<<5, VGA_SR_DATA); + vga_put(dev->pdev, VGA_RSRC_LEGACY_IO); + udelay(300); + } I915_WRITE(vga_reg, VGA_DISP_DISABLE); POSTING_READ(vga_reg); -- 1.8.5.1
next reply other threads:[~2013-12-17 17:19 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-12-17 17:12 Keith Packard [this message] 2013-12-17 17:12 ` [PATCH] drm/intel: Only smash VGA SR01 register if intel is default VGA device Keith Packard 2013-12-17 17:27 ` [Intel-gfx] " Chris Wilson 2013-12-17 17:27 ` Chris Wilson 2013-12-17 18:17 ` [Intel-gfx] " Keith Packard 2013-12-17 18:57 ` Chris Wilson 2013-12-17 18:57 ` Chris Wilson 2013-12-18 0:14 ` Keith Packard 2013-12-18 0:14 ` Keith Packard
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