[PATCH] radeonfb sleep fixes

Many IBM Thinkpad T4* models and some R* and X* with radeon video cards draw
too much power when suspended to RAM, reducing drastically the battery
lifetime.  The solution is to enable suspend-to-D2 on these machines.  They
are whitelisted through their subsystem vendor/device ID.  This fixes
http://bugzilla.kernel.org/show_bug.cgi?id=3022

The patch introduces a framework to alter the pm_mode and reinit_func fields
of the radeonfb_info structure based on a whitelist.  This should facilitate
future hardware-dependent workarounds.  The workaround for the Samsung P35
that is already in the radeonfb code has been rewritten using this framework.

The behavior can be overridden with module options:

i)  video=radeonfb:force_sleep=1
    enable suspend-to-D2 also on non-whitelisted machines (useful for
    testing new notebook models),

ii) video=radeonfb:ignore_devlist=1
    Disable checking the whitelist and do not apply any workarounds.

Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 125 insertions, 21 deletions

diff --git a/drivers/video/aty/radeon_pm.c b/drivers/video/aty/radeon_pm.c
index c7091761cef4..f31e606a2ded 100644
--- a/drivers/video/aty/radeon_pm.c
+++ b/drivers/video/aty/radeon_pm.c
@@ -27,6 +27,99 @@
 
 #include "ati_ids.h"
 
+static void radeon_reinitialize_M10(struct radeonfb_info *rinfo);
+
+/*
+ * Workarounds for bugs in PC laptops:
+ * - enable D2 sleep in some IBM Thinkpads
+ * - special case for Samsung P35
+ *
+ * Whitelist by subsystem vendor/device because
+ * its the subsystem vendor's fault!
+ */
+
+#if defined(CONFIG_PM) && defined(CONFIG_X86)
+struct radeon_device_id {
+        const char *ident;                     /* (arbitrary) Name */
+        const unsigned short subsystem_vendor; /* Subsystem Vendor ID */
+        const unsigned short subsystem_device; /* Subsystem Device ID */
+        const enum radeon_pm_mode pm_mode_modifier; /* modify pm_mode */
+        const reinit_function_ptr new_reinit_func;   /* changed reinit_func */
+};
+
+#define BUGFIX(model, sv, sd, pm, fn) { \
+        .ident = model, \
+        .subsystem_vendor = sv, \
+        .subsystem_device = sd, \
+        .pm_mode_modifier = pm, \
+        .new_reinit_func  = fn  \
+}
+
+static struct radeon_device_id radeon_workaround_list[] = {
+        BUGFIX("IBM Thinkpad R32",
+               PCI_VENDOR_ID_IBM, 0x1905,
+               radeon_pm_d2, NULL),
+        BUGFIX("IBM Thinkpad R40",
+               PCI_VENDOR_ID_IBM, 0x0526,
+               radeon_pm_d2, NULL),
+        BUGFIX("IBM Thinkpad R40",
+               PCI_VENDOR_ID_IBM, 0x0527,
+               radeon_pm_d2, NULL),
+        BUGFIX("IBM Thinkpad R50/R51/T40/T41",
+               PCI_VENDOR_ID_IBM, 0x0531,
+               radeon_pm_d2, NULL),
+        BUGFIX("IBM Thinkpad R51/T40/T41/T42",
+               PCI_VENDOR_ID_IBM, 0x0530,
+               radeon_pm_d2, NULL),
+        BUGFIX("IBM Thinkpad T30",
+               PCI_VENDOR_ID_IBM, 0x0517,
+               radeon_pm_d2, NULL),
+        BUGFIX("IBM Thinkpad T40p",
+               PCI_VENDOR_ID_IBM, 0x054d,
+               radeon_pm_d2, NULL),
+        BUGFIX("IBM Thinkpad T42",
+               PCI_VENDOR_ID_IBM, 0x0550,
+               radeon_pm_d2, NULL),
+        BUGFIX("IBM Thinkpad X31/X32",
+               PCI_VENDOR_ID_IBM, 0x052f,
+               radeon_pm_d2, NULL),
+        BUGFIX("Samsung P35",
+               PCI_VENDOR_ID_SAMSUNG, 0xc00c,
+               radeon_pm_off, radeon_reinitialize_M10),
+        { .ident = NULL }
+};
+
+static int radeon_apply_workarounds(struct radeonfb_info *rinfo)
+{
+        struct radeon_device_id *id;
+
+        for (id = radeon_workaround_list; id->ident != NULL; id++ )
+                if ((id->subsystem_vendor == rinfo->pdev->subsystem_vendor ) &&
+                    (id->subsystem_device == rinfo->pdev->subsystem_device )) {
+
+                        /* we found a device that requires workaround */
+                        printk(KERN_DEBUG "radeonfb: %s detected"
+                               ", enabling workaround\n", id->ident);
+
+                        rinfo->pm_mode |= id->pm_mode_modifier;
+
+                        if (id->new_reinit_func != NULL)
+                                rinfo->reinit_func = id->new_reinit_func;
+
+                        return 1;
+                }
+        return 0;  /* not found */
+}
+
+#else  /* defined(CONFIG_PM) && defined(CONFIG_X86) */
+static inline int radeon_apply_workarounds(struct radeonfb_info *rinfo)
+{
+        return 0;
+}
+#endif /* defined(CONFIG_PM) && defined(CONFIG_X86) */
+
+
+
 static void radeon_pm_disable_dynamic_mode(struct radeonfb_info *rinfo)
 {
         u32 tmp;
@@ -852,18 +945,26 @@ static void radeon_pm_setup_for_suspend(struct radeonfb_info *rinfo)
         /* because both INPLL and OUTPLL take the same lock, that's why. */
         tmp = INPLL( pllMCLK_MISC) | MCLK_MISC__EN_MCLK_TRISTATE_IN_SUSPEND;
         OUTPLL( pllMCLK_MISC, tmp);
-        
-        /* AGP PLL control */
-        if (rinfo->family <= CHIP_FAMILY_RV280) {
-                OUTREG(BUS_CNTL1, INREG(BUS_CNTL1) |  BUS_CNTL1__AGPCLK_VALID);
 
-                OUTREG(BUS_CNTL1,
-                       (INREG(BUS_CNTL1) & ~BUS_CNTL1__MOBILE_PLATFORM_SEL_MASK)
-                       | (2<<BUS_CNTL1__MOBILE_PLATFORM_SEL__SHIFT));   // 440BX
-        } else {
-                OUTREG(BUS_CNTL1, INREG(BUS_CNTL1));
-                OUTREG(BUS_CNTL1, (INREG(BUS_CNTL1) & ~0x4000) | 0x8000);
+        /* BUS_CNTL1__MOBILE_PLATORM_SEL setting is northbridge chipset
+         * and radeon chip dependent. Thus we only enable it on Mac for
+         * now (until we get more info on how to compute the correct
+         * value for various X86 bridges).
+         */
+#ifdef CONFIG_PPC_PMAC
+        if (machine_is(powermac)) {
+                /* AGP PLL control */
+                if (rinfo->family <= CHIP_FAMILY_RV280) {
+                        OUTREG(BUS_CNTL1, INREG(BUS_CNTL1) |  BUS_CNTL1__AGPCLK_VALID);
+                        OUTREG(BUS_CNTL1,
+                               (INREG(BUS_CNTL1) & ~BUS_CNTL1__MOBILE_PLATFORM_SEL_MASK)
+                               | (2<<BUS_CNTL1__MOBILE_PLATFORM_SEL__SHIFT));   // 440BX
+                } else {
+                        OUTREG(BUS_CNTL1, INREG(BUS_CNTL1));
+                        OUTREG(BUS_CNTL1, (INREG(BUS_CNTL1) & ~0x4000) | 0x8000);
+                }
         }
+#endif
 
         OUTREG(CRTC_OFFSET_CNTL, (INREG(CRTC_OFFSET_CNTL)
                                   & ~CRTC_OFFSET_CNTL__CRTC_STEREO_SYNC_OUT_EN));
@@ -2713,7 +2814,7 @@ static void radeonfb_early_resume(void *data)
 
 #endif /* CONFIG_PM */
 
-void radeonfb_pm_init(struct radeonfb_info *rinfo, int dynclk)
+void radeonfb_pm_init(struct radeonfb_info *rinfo, int dynclk, int ignore_devlist, int force_sleep)
 {
         /* Find PM registers in config space if any*/
         rinfo->pm_reg = pci_find_capability(rinfo->pdev, PCI_CAP_ID_PM);
@@ -2729,22 +2830,13 @@ void radeonfb_pm_init(struct radeonfb_info *rinfo, int dynclk)
         }
 
 #if defined(CONFIG_PM)
+#if defined(CONFIG_PPC_PMAC)
         /* Check if we can power manage on suspend/resume. We can do
          * D2 on M6, M7 and M9, and we can resume from D3 cold a few other
          * "Mac" cards, but that's all. We need more infos about what the
          * BIOS does tho. Right now, all this PM stuff is pmac-only for that
          * reason. --BenH
          */
-        /* Special case for Samsung P35 laptops
-         */
-        if ((rinfo->pdev->vendor == PCI_VENDOR_ID_ATI) &&
-            (rinfo->pdev->device == PCI_CHIP_RV350_NP) &&
-            (rinfo->pdev->subsystem_vendor == PCI_VENDOR_ID_SAMSUNG) &&
-            (rinfo->pdev->subsystem_device == 0xc00c)) {
-                rinfo->reinit_func = radeon_reinitialize_M10;
-                rinfo->pm_mode |= radeon_pm_off;
-        }
-#if defined(CONFIG_PPC_PMAC)
         if (machine_is(powermac) && rinfo->of_node) {
                 if (rinfo->is_mobility && rinfo->pm_reg &&
                     rinfo->family <= CHIP_FAMILY_RV250)
@@ -2790,6 +2882,18 @@ void radeonfb_pm_init(struct radeonfb_info *rinfo, int dynclk)
         }
 #endif /* defined(CONFIG_PPC_PMAC) */
 #endif /* defined(CONFIG_PM) */
+
+        if (ignore_devlist)
+                printk(KERN_DEBUG
+                       "radeonfb: skipping test for device workarounds\n");
+        else
+                radeon_apply_workarounds(rinfo);
+
+        if (force_sleep) {
+                printk(KERN_DEBUG
+                       "radeonfb: forcefully enabling D2 sleep mode\n");
+                rinfo->pm_mode |= radeon_pm_d2;
+        }
 }
 
 void radeonfb_pm_exit(struct radeonfb_info *rinfo)