This is a note to let you know that I've just added the patch titled
drm/mgag200: Added resolution and bandwidth limits for various G200e products.
to the 3.10-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-mgag200-added-resolution-and-bandwidth-limits-for-various-g200e-products.patch
and it can be found in the queue-3.10 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From abbee6238775c6633a3779962e9e5b5cb9823749 Mon Sep 17 00:00:00 2001
From: Julia Lemire <jlemire@xxxxxxxxxx>
Date: Thu, 27 Jun 2013 13:38:59 -0400
Subject: drm/mgag200: Added resolution and bandwidth limits for various G200e products.
From: Julia Lemire <jlemire@xxxxxxxxxx>
commit abbee6238775c6633a3779962e9e5b5cb9823749 upstream.
At the larger resolutions, the g200e series sometimes struggles with
maintaining a proper output. Problems like flickering or black bands appearing
on screen can occur. In order to avoid this, limitations regarding resolutions
and bandwidth have been added for the different variations of the g200e series.
This code was ported from the old xorg mga driver.
Signed-off-by: Julia Lemire <jlemire@xxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/mgag200/mgag200_drv.h | 3 -
drivers/gpu/drm/mgag200/mgag200_main.c | 2
drivers/gpu/drm/mgag200/mgag200_mode.c | 70 +++++++++++++++++++++++++++++++--
3 files changed, 70 insertions(+), 5 deletions(-)
--- a/drivers/gpu/drm/mgag200/mgag200_drv.h
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
@@ -198,7 +198,8 @@ struct mga_device {
struct ttm_bo_device bdev;
} ttm;
- u32 reg_1e24; /* SE model number */
+ /* SE model number stored in reg 0x1e24 */
+ u32 unique_rev_id;
};
--- a/drivers/gpu/drm/mgag200/mgag200_main.c
+++ b/drivers/gpu/drm/mgag200/mgag200_main.c
@@ -176,7 +176,7 @@ static int mgag200_device_init(struct dr
/* stash G200 SE model number for later use */
if (IS_G200_SE(mdev))
- mdev->reg_1e24 = RREG32(0x1e24);
+ mdev->unique_rev_id = RREG32(0x1e24);
ret = mga_vram_init(mdev);
if (ret)
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1008,7 +1008,7 @@ static int mga_crtc_mode_set(struct drm_
if (IS_G200_SE(mdev)) {
- if (mdev->reg_1e24 >= 0x02) {
+ if (mdev->unique_rev_id >= 0x02) {
u8 hi_pri_lvl;
u32 bpp;
u32 mb;
@@ -1038,7 +1038,7 @@ static int mga_crtc_mode_set(struct drm_
WREG8(MGAREG_CRTCEXT_DATA, hi_pri_lvl);
} else {
WREG8(MGAREG_CRTCEXT_INDEX, 0x06);
- if (mdev->reg_1e24 >= 0x01)
+ if (mdev->unique_rev_id >= 0x01)
WREG8(MGAREG_CRTCEXT_DATA, 0x03);
else
WREG8(MGAREG_CRTCEXT_DATA, 0x04);
@@ -1410,6 +1410,32 @@ static int mga_vga_get_modes(struct drm_
return ret;
}
+static uint32_t mga_vga_calculate_mode_bandwidth(struct drm_display_mode *mode,
+ int bits_per_pixel)
+{
+ uint32_t total_area, divisor;
+ int64_t active_area, pixels_per_second, bandwidth;
+ uint64_t bytes_per_pixel = (bits_per_pixel + 7) / 8;
+
+ divisor = 1024;
+
+ if (!mode->htotal || !mode->vtotal || !mode->clock)
+ return 0;
+
+ active_area = mode->hdisplay * mode->vdisplay;
+ total_area = mode->htotal * mode->vtotal;
+
+ pixels_per_second = active_area * mode->clock * 1000;
+ do_div(pixels_per_second, total_area);
+
+ bandwidth = pixels_per_second * bytes_per_pixel * 100;
+ do_div(bandwidth, divisor);
+
+ return (uint32_t)(bandwidth);
+}
+
+#define MODE_BANDWIDTH MODE_BAD
+
static int mga_vga_mode_valid(struct drm_connector *connector,
struct drm_display_mode *mode)
{
@@ -1421,7 +1447,45 @@ static int mga_vga_mode_valid(struct drm
int bpp = 32;
int i = 0;
- /* FIXME: Add bandwidth and g200se limitations */
+ if (IS_G200_SE(mdev)) {
+ if (mdev->unique_rev_id == 0x01) {
+ if (mode->hdisplay > 1600)
+ return MODE_VIRTUAL_X;
+ if (mode->vdisplay > 1200)
+ return MODE_VIRTUAL_Y;
+ if (mga_vga_calculate_mode_bandwidth(mode, bpp)
+ > (24400 * 1024))
+ return MODE_BANDWIDTH;
+ } else if (mdev->unique_rev_id >= 0x02) {
+ if (mode->hdisplay > 1920)
+ return MODE_VIRTUAL_X;
+ if (mode->vdisplay > 1200)
+ return MODE_VIRTUAL_Y;
+ if (mga_vga_calculate_mode_bandwidth(mode, bpp)
+ > (30100 * 1024))
+ return MODE_BANDWIDTH;
+ }
+ } else if (mdev->type == G200_WB) {
+ if (mode->hdisplay > 1280)
+ return MODE_VIRTUAL_X;
+ if (mode->vdisplay > 1024)
+ return MODE_VIRTUAL_Y;
+ if (mga_vga_calculate_mode_bandwidth(mode,
+ bpp > (31877 * 1024)))
+ return MODE_BANDWIDTH;
+ } else if (mdev->type == G200_EV &&
+ (mga_vga_calculate_mode_bandwidth(mode, bpp)
+ > (32700 * 1024))) {
+ return MODE_BANDWIDTH;
+ } else if (mode->type == G200_EH &&
+ (mga_vga_calculate_mode_bandwidth(mode, bpp)
+ > (37500 * 1024))) {
+ return MODE_BANDWIDTH;
+ } else if (mode->type == G200_ER &&
+ (mga_vga_calculate_mode_bandwidth(mode,
+ bpp) > (55000 * 1024))) {
+ return MODE_BANDWIDTH;
+ }
if (mode->crtc_hdisplay > 2048 || mode->crtc_hsync_start > 4096 ||
mode->crtc_hsync_end > 4096 || mode->crtc_htotal > 4096 ||
Patches currently in stable-queue which might be from jlemire@xxxxxxxxxx are
queue-3.10/drm-mgag200-added-resolution-and-bandwidth-limits-for-various-g200e-products.patch
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