Patch "drm/vmwgfx: Add an option to change assumed FB bpp" has been added to the 4.6-stable tree

Patch "drm/vmwgfx: Add an option to change assumed FB bpp" has been added to the 4.6-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/vmwgfx: Add an option to change assumed FB bpp

to the 4.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-vmwgfx-add-an-option-to-change-assumed-fb-bpp.patch
and it can be found in the queue-4.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 04319d89fbec72dfd60738003c3813b97c1d5f5a Mon Sep 17 00:00:00 2001
From: Sinclair Yeh <syeh@vmware.com>
Date: Wed, 29 Jun 2016 12:15:48 -0700
Subject: drm/vmwgfx: Add an option to change assumed FB bpp

From: Sinclair Yeh <syeh@vmware.com>

commit 04319d89fbec72dfd60738003c3813b97c1d5f5a upstream.

Offer an option for advanced users who want larger modes at 16bpp.

This becomes necessary after the fix: "Work around mode set
failure in 2D VMs."  Without this patch, there would be no way
for existing advanced users to get to a high res mode, and the
regression is they will likely get a black screen after a software
update on their current VM.

Signed-off-by: Sinclair Yeh <syeh@vmware.com>
Reviewed-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c |    5 +++++
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.h |    1 +
 drivers/gpu/drm/vmwgfx/vmwgfx_kms.c |    3 +++
 3 files changed, 9 insertions(+)

--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -227,6 +227,7 @@ static int vmw_force_iommu;
 static int vmw_restrict_iommu;
 static int vmw_force_coherent;
 static int vmw_restrict_dma_mask;
+static int vmw_assume_16bpp;
 
 static int vmw_probe(struct pci_dev *, const struct pci_device_id *);
 static void vmw_master_init(struct vmw_master *);
@@ -243,6 +244,8 @@ MODULE_PARM_DESC(force_coherent, "Force
 module_param_named(force_coherent, vmw_force_coherent, int, 0600);
 MODULE_PARM_DESC(restrict_dma_mask, "Restrict DMA mask to 44 bits with IOMMU");
 module_param_named(restrict_dma_mask, vmw_restrict_dma_mask, int, 0600);
+MODULE_PARM_DESC(assume_16bpp, "Assume 16-bpp when filtering modes");
+module_param_named(assume_16bpp, vmw_assume_16bpp, int, 0600);
 
 
 static void vmw_print_capabilities(uint32_t capabilities)
@@ -653,6 +656,8 @@ static int vmw_driver_load(struct drm_de
 	dev_priv->vram_start = pci_resource_start(dev->pdev, 1);
 	dev_priv->mmio_start = pci_resource_start(dev->pdev, 2);
 
+	dev_priv->assume_16bpp = !!vmw_assume_16bpp;
+
 	dev_priv->enable_fb = enable_fbdev;
 
 	vmw_write(dev_priv, SVGA_REG_ID, SVGA_ID_2);
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.h
@@ -386,6 +386,7 @@ struct vmw_private {
 	spinlock_t hw_lock;
 	spinlock_t cap_lock;
 	bool has_dx;
+	bool assume_16bpp;
 
 	/*
 	 * VGA registers.
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_kms.c
@@ -1562,6 +1562,9 @@ int vmw_du_connector_fill_modes(struct d
 	if (dev_priv->active_display_unit == vmw_du_screen_object)
 		assumed_bpp = 4;
 
+	if (dev_priv->assume_16bpp)
+		assumed_bpp = 2;
+
 	if (dev_priv->active_display_unit == vmw_du_screen_target) {
 		max_width  = min(max_width,  dev_priv->stdu_max_width);
 		max_height = min(max_height, dev_priv->stdu_max_height);


Patches currently in stable-queue which might be from syeh@vmware.com are

queue-4.6/drm-ttm-make-ttm_bo_mem_compat-available.patch
queue-4.6/drm-vmwgfx-delay-pinning-fbdev-framebuffer-until-after-mode-set.patch
queue-4.6/drm-vmwgfx-add-an-option-to-change-assumed-fb-bpp.patch
queue-4.6/drm-vmwgfx-fix-corner-case-screen-target-management.patch
queue-4.6/drm-vmwgfx-check-pin-count-before-attempting-to-move-a-buffer.patch
queue-4.6/drm-vmwgfx-work-around-mode-set-failure-in-2d-vms.patch
queue-4.6/drm-vmwgfx-fix-error-paths-when-mapping-framebuffer.patch