viafb: add VIA slapping capability

This patch introduces dummy functions to execute when we don't know
what we should do (due to missing documentation). They do nothing
but print a nice message in the log explaining the situation.
To trigger this message initial power management support is
activated which might save a bit energy by disabling PLL and clock
if no device is configured to use them.

Note: The message is only shown for the oldest IGPs CLE266 and K400
      as for the other platforms there are reasonable assumptions
      how it does (hopefully) work.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/video/via/hw.c b/drivers/video/via/hw.c
index f1eff0b4831..df84251b8f9 100644
--- a/drivers/video/via/hw.c
+++ b/drivers/video/via/hw.c
@@ -2289,6 +2289,25 @@ int viafb_setmode(struct VideoModeTable *vmode_tbl, int video_bpp,
 			get_sync(viafbinfo1));
 	}
 
+	clock.set_primary_clock_source(VIA_CLKSRC_X1, true);
+	clock.set_secondary_clock_source(VIA_CLKSRC_X1, true);
+
+	if (viaparinfo->shared->iga1_devices) {
+		clock.set_primary_pll_state(VIA_STATE_ON);
+		clock.set_primary_clock_state(VIA_STATE_ON);
+	} else {
+		clock.set_primary_pll_state(VIA_STATE_OFF);
+		clock.set_primary_clock_state(VIA_STATE_OFF);
+	}
+
+	if (viaparinfo->shared->iga2_devices) {
+		clock.set_secondary_pll_state(VIA_STATE_ON);
+		clock.set_secondary_clock_state(VIA_STATE_ON);
+	} else {
+		clock.set_secondary_pll_state(VIA_STATE_OFF);
+		clock.set_secondary_clock_state(VIA_STATE_OFF);
+	}
+
 	via_set_state(devices, VIA_STATE_ON);
 	device_screen_on();
 	return 1;