drm/nouveau: improve memtiming table parsing

Improves the parsing of the memory timing table on NV50-NV98revA1 chipsets.

Added stepping to drm_nouveau_private to make sure newer NV98 (105M) is
zero rather than incorrect.

Signed-off-by: Roy Spliet <r.spliet@student.tudelft.nl>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

3 files changed, 35 insertions, 14 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_drv.h b/drivers/gpu/drm/nouveau/nouveau_drv.h
index 711ee0d9627d..0f5f797e500c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_drv.h
+++ b/drivers/gpu/drm/nouveau/nouveau_drv.h
@@ -466,6 +466,7 @@ struct nouveau_pm_memtiming {
         u32 reg_100234;
         u32 reg_100238;
         u32 reg_10023c;
+        u32 reg_100240;
 };
 
 struct nouveau_pm_memtimings {
@@ -637,6 +638,7 @@ struct drm_nouveau_private {
         enum nouveau_card_type card_type;
         /* exact chipset, derived from NV_PMC_BOOT_0 */
         int chipset;
+        int stepping;
         int flags;
 
         void __iomem *mmio;
diff --git a/drivers/gpu/drm/nouveau/nouveau_mem.c b/drivers/gpu/drm/nouveau/nouveau_mem.c
index e177a62967e0..cf1731bbb032 100644
--- a/drivers/gpu/drm/nouveau/nouveau_mem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_mem.c
@@ -597,9 +597,9 @@ nouveau_mem_timing_init(struct drm_device *dev)
         if (!memtimings->timing)
                 return;
 
-        /* Get "some number" from the timing reg for NV_40
+        /* Get "some number" from the timing reg for NV_40 and NV_50
          * Used in calculations later */
-        if (dev_priv->card_type == NV_40) {
+        if (dev_priv->card_type >= NV_40 && dev_priv->chipset < 0x98) {
                 magic_number = (nv_rd32(dev, 0x100228) & 0x0f000000) >> 24;
         }
 
@@ -643,7 +643,7 @@ nouveau_mem_timing_init(struct drm_device *dev)
                 /* XXX: I don't trust the -1's and +1's... they must come
                  *      from somewhere! */
                 timing->reg_100224 = (tUNK_0 + tUNK_19 + 1 + magic_number) << 24 |
-                                      tUNK_18 << 16 |
+                                      max(tUNK_18, (u8) 1) << 16 |
                                       (tUNK_1 + tUNK_19 + 1 + magic_number) << 8;
                 if (dev_priv->chipset == 0xa8) {
                         timing->reg_100224 |= (tUNK_2 - 1);
@@ -652,17 +652,27 @@ nouveau_mem_timing_init(struct drm_device *dev)
                 }
 
                 timing->reg_100228 = (tUNK_12 << 16 | tUNK_11 << 8 | tUNK_10);
-                if (dev_priv->chipset >= 0xa3 && dev_priv->chipset < 0xaa) {
+                if (dev_priv->chipset >= 0xa3 && dev_priv->chipset < 0xaa)
                         timing->reg_100228 |= (tUNK_19 - 1) << 24;
-                }
+                else
+                        timing->reg_100228 |= magic_number << 24;
 
                 if (dev_priv->card_type == NV_40) {
                         /* NV40: don't know what the rest of the regs are..
                          * And don't need to know either */
-                        timing->reg_100228 |= 0x20200000 | magic_number << 24;
+                        timing->reg_100228 |= 0x20200000;
                 } else if (dev_priv->card_type >= NV_50) {
-                        /* XXX: reg_10022c */
-                        timing->reg_10022c = tUNK_2 - 1;
+                        if (dev_priv->chipset < 0x98 ||
+                            (dev_priv->chipset == 0x98 &&
+                             dev_priv->stepping <= 0xa1)) {
+                                timing->reg_10022c = (0x14 + tUNK_2) << 24 |
+                                                     0x16 << 16 |
+                                                     (tUNK_2 - 1) << 8 |
+                                                     (tUNK_2 - 1);
+                        } else {
+                                /* XXX: reg_10022c for recentish cards */
+                                timing->reg_10022c = tUNK_2 - 1;
+                        }
 
                         timing->reg_100230 = (tUNK_20 << 24 | tUNK_21 << 16 |
                                                   tUNK_13 << 8  | tUNK_13);
@@ -670,23 +680,29 @@ nouveau_mem_timing_init(struct drm_device *dev)
                         timing->reg_100234 = (tRAS << 24 | tRC);
                         timing->reg_100234 += max(tUNK_10, tUNK_11) << 16;
 
-                        if (dev_priv->chipset < 0xa3) {
+                        if (dev_priv->chipset < 0x98 ||
+                            (dev_priv->chipset == 0x98 &&
+                             dev_priv->stepping <= 0xa1)) {
                                 timing->reg_100234 |= (tUNK_2 + 2) << 8;
                         } else {
                                 /* XXX: +6? */
                                 timing->reg_100234 |= (tUNK_19 + 6) << 8;
                         }
 
-                        /* XXX; reg_100238, reg_10023c
-                         * reg_100238: 0x00??????
-                         * reg_10023c: 0x!!??0202 for NV50+ cards (empirical evidence) */
+                        /* XXX; reg_100238
+                         * reg_100238: 0x00?????? */
                         timing->reg_10023c = 0x202;
-                        if (dev_priv->chipset < 0xa3) {
+                        if (dev_priv->chipset < 0x98 ||
+                            (dev_priv->chipset == 0x98 &&
+                             dev_priv->stepping <= 0xa1)) {
                                 timing->reg_10023c |= 0x4000000 | (tUNK_2 - 1) << 16;
                         } else {
-                                /* currently unknown
+                                /* XXX: reg_10023c
+                                 * currently unknown
                                  * 10023c seen as 06xxxxxx, 0bxxxxxx or 0fxxxxxx */
                         }
+
+                        /* XXX: reg_100240? */
                 }
 
                 NV_DEBUG(dev, "Entry %d: 220: %08x %08x %08x %08x\n", i,
@@ -695,6 +711,7 @@ nouveau_mem_timing_init(struct drm_device *dev)
                 NV_DEBUG(dev, "         230: %08x %08x %08x %08x\n",
                          timing->reg_100230, timing->reg_100234,
                          timing->reg_100238, timing->reg_10023c);
+                NV_DEBUG(dev, "         240: %08x\n", timing->reg_100240);
         }
 
         memtimings->nr_timing = entries;
diff --git a/drivers/gpu/drm/nouveau/nouveau_state.c b/drivers/gpu/drm/nouveau/nouveau_state.c
index e04c4b651955..4b4992824bbf 100644
--- a/drivers/gpu/drm/nouveau/nouveau_state.c
+++ b/drivers/gpu/drm/nouveau/nouveau_state.c
@@ -913,11 +913,13 @@ int nouveau_load(struct drm_device *dev, unsigned long flags)
 
         /* Time to determine the card architecture */
         reg0 = nv_rd32(dev, NV03_PMC_BOOT_0);
+        dev_priv->stepping = 0; /* XXX: add stepping for pre-NV10? */
 
         /* We're dealing with >=NV10 */
         if ((reg0 & 0x0f000000) > 0) {
                 /* Bit 27-20 contain the architecture in hex */
                 dev_priv->chipset = (reg0 & 0xff00000) >> 20;
+                dev_priv->stepping = (reg0 & 0xff);
         /* NV04 or NV05 */
         } else if ((reg0 & 0xff00fff0) == 0x20004000) {
                 if (reg0 & 0x00f00000)