pm2fb: Permedia 2V memory clock setting

Permedia 2V uses its own registers to set a memory clock. The
patch adds these registers and uses them in the set_memclock()
function.
Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/pm2fb.c

@@ -462,6 +462,26 @@ static void set_memclock(struct pm2fb_par* par, u32 clk)
 	int i;
 	unsigned char m, n, p;
 
+	switch (par->type) {
+	case PM2_TYPE_PERMEDIA2V:
+		pm2v_mnp(clk/2, &m, &n, &p);
+		WAIT_FIFO(par, 8);
+		pm2_WR(par, PM2VR_RD_INDEX_HIGH, PM2VI_RD_MCLK_CONTROL >> 8);
+		pm2v_RDAC_WR(par, PM2VI_RD_MCLK_CONTROL, 0);
+		wmb();
+		pm2v_RDAC_WR(par, PM2VI_RD_MCLK_PRESCALE, m);
+		pm2v_RDAC_WR(par, PM2VI_RD_MCLK_FEEDBACK, n);
+		pm2v_RDAC_WR(par, PM2VI_RD_MCLK_POSTSCALE, p);
+		wmb();
+		pm2v_RDAC_WR(par, PM2VI_RD_MCLK_CONTROL, 1);
+		rmb();
+		for (i = 256;
+		     i && !(pm2_RDAC_RD(par, PM2VI_RD_MCLK_CONTROL) & 2);
+		     i--)
+			;
+		pm2_WR(par, PM2VR_RD_INDEX_HIGH, 0);
+		break;
+	case PM2_TYPE_PERMEDIA2:
 		pm2_mnp(clk, &m, &n, &p);
 		WAIT_FIFO(par, 10);
 		pm2_RDAC_WR(par, PM2I_RD_MEMORY_CLOCK_3, 6);
@@ -477,6 +497,8 @@ static void set_memclock(struct pm2fb_par* par, u32 clk)
 		     i && !(pm2_RD(par, PM2R_RD_INDEXED_DATA) & PM2F_PLL_LOCKED);
 		     i--)
 			;
+		break;
+	}
 }
 
 static void set_pixclock(struct pm2fb_par* par, u32 clk)

include/video/permedia2.h

@@ -154,6 +154,10 @@
 #define PM2VI_RD_CLK1_PRESCALE				0x204
 #define PM2VI_RD_CLK1_FEEDBACK				0x205
 #define PM2VI_RD_CLK1_POSTSCALE				0x206
+#define PM2VI_RD_MCLK_CONTROL				0x20D
+#define PM2VI_RD_MCLK_PRESCALE				0x20E
+#define PM2VI_RD_MCLK_FEEDBACK				0x20F
+#define PM2VI_RD_MCLK_POSTSCALE				0x210
 #define PM2VI_RD_CURSOR_PALETTE				0x303
 #define PM2VI_RD_CURSOR_PATTERN				0x400