video: da8xx-fb: set upstream clock rate (if reqd)

Based on original patch by: Afzal Mohammed <afzal@ti.com>

LCDC IP has a clock divider to adjust pixel clock, this limits pixel
clock range to fck/255 - fck/2(fck - rate of input clock to LCDC IP).
In the case of AM335x, where this IP is present, default fck is not
sufficient to provide normal pixel clock rates, hence rendering this
driver unusable on AM335x.

If input clock too is configurable, allowable range of pixel clock
would increase. Here initially it is checked whether with present fck,
divider in IP could be configured to obtain required rate, if not,
fck is adjusted. This makes it usable on AM335x.

Note:
Another solution would be to model an inherited basic clock divider of
CCF, an advantage would be a better possible resolution for pixel clk.
And trying to instantiate a CCF clock would mean that to be consistent,
3 bits being turned on to enable clocks of LCDC IP would have to be
modeled as gate clocks. Now that would bring in a total of 4 clocks,
including necessity to create a new inherited divider clock, and that
mean a branch of clock tree would be present in LCDC driver. This
would add complexity to LCDC driver bringing in considerable amount
of clock handling code, and this would not bring in much advantage
for existing use cases other than providing a higher resolution of
pixel clock. And existing use cases work without relying on clock
modeling. Another fact is that out of the two platform's using this
driver DaVinci is not yet converted to CCF. In future if higher
resolution of pixel clock is required, and probably after DaVinci is
CCF'ed, modeling clock nodes inside driver may be considered.

v2: purely cosmetic changes to try and clarify what variables are
	being used for in the clock rate / divider calculations

Signed-off-by: Darren Etheridge <detheridge@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/da8xx-fb.c

@@ -132,6 +132,9 @@
 #define WSI_TIMEOUT	50
 #define PALETTE_SIZE	256
 
+#define	CLK_MIN_DIV	2
+#define	CLK_MAX_DIV	255
+
 static void __iomem *da8xx_fb_reg_base;
 static unsigned int lcd_revision;
 static irq_handler_t lcdc_irq_handler;
@@ -684,38 +687,76 @@ static void da8xx_fb_lcd_reset(void)
 	}
 }
 
-static inline unsigned da8xx_fb_calc_clk_divider(struct da8xx_fb_par *par,
-						 unsigned pixclock)
-{
-	return par->lcd_fck_rate / (PICOS2KHZ(pixclock) * 1000);
-}
-
-static inline unsigned da8xx_fb_round_clk(struct da8xx_fb_par *par,
-					  unsigned pixclock)
+static int da8xx_fb_config_clk_divider(struct da8xx_fb_par *par,
+					      unsigned lcdc_clk_div,
+					      unsigned lcdc_clk_rate)
 {
-	unsigned div;
+	int ret;
 
-	div = da8xx_fb_calc_clk_divider(par, pixclock);
-	return KHZ2PICOS(par->lcd_fck_rate / (1000 * div));
-}
+	if (par->lcd_fck_rate != lcdc_clk_rate) {
+		ret = clk_set_rate(par->lcdc_clk, lcdc_clk_rate);
+		if (IS_ERR_VALUE(ret)) {
+			dev_err(par->dev,
+				"unable to set clock rate at %u\n",
+				lcdc_clk_rate);
+			return ret;
+		}
+		par->lcd_fck_rate = clk_get_rate(par->lcdc_clk);
+	}
 
-static inline void da8xx_fb_config_clk_divider(unsigned div)
-{
 	/* Configure the LCD clock divisor. */
-	lcdc_write(LCD_CLK_DIVISOR(div) |
+	lcdc_write(LCD_CLK_DIVISOR(lcdc_clk_div) |
 			(LCD_RASTER_MODE & 0x1), LCD_CTRL_REG);
 
 	if (lcd_revision == LCD_VERSION_2)
 		lcdc_write(LCD_V2_DMA_CLK_EN | LCD_V2_LIDD_CLK_EN |
 				LCD_V2_CORE_CLK_EN, LCD_CLK_ENABLE_REG);
+
+	return 0;
+}
+
+static unsigned int da8xx_fb_calc_clk_divider(struct da8xx_fb_par *par,
+					      unsigned pixclock,
+					      unsigned *lcdc_clk_rate)
+{
+	unsigned lcdc_clk_div;
+
+	pixclock = PICOS2KHZ(pixclock) * 1000;
+
+	*lcdc_clk_rate = par->lcd_fck_rate;
+
+	if (pixclock < (*lcdc_clk_rate / CLK_MAX_DIV)) {
+		*lcdc_clk_rate = clk_round_rate(par->lcdc_clk,
+						pixclock * CLK_MAX_DIV);
+		lcdc_clk_div = CLK_MAX_DIV;
+	} else if (pixclock > (*lcdc_clk_rate / CLK_MIN_DIV)) {
+		*lcdc_clk_rate = clk_round_rate(par->lcdc_clk,
+						pixclock * CLK_MIN_DIV);
+		lcdc_clk_div = CLK_MIN_DIV;
+	} else {
+		lcdc_clk_div = *lcdc_clk_rate / pixclock;
+	}
+
+	return lcdc_clk_div;
 }
 
-static inline void da8xx_fb_calc_config_clk_divider(struct da8xx_fb_par *par,
-						    struct fb_videomode *mode)
+static int da8xx_fb_calc_config_clk_divider(struct da8xx_fb_par *par,
+					    struct fb_videomode *mode)
 {
-	unsigned div = da8xx_fb_calc_clk_divider(par, mode->pixclock);
+	unsigned lcdc_clk_rate;
+	unsigned lcdc_clk_div = da8xx_fb_calc_clk_divider(par, mode->pixclock,
+							  &lcdc_clk_rate);
 
-	da8xx_fb_config_clk_divider(div);
+	return da8xx_fb_config_clk_divider(par, lcdc_clk_div, lcdc_clk_rate);
+}
+
+static inline unsigned da8xx_fb_round_clk(struct da8xx_fb_par *par,
+					  unsigned pixclock)
+{
+	unsigned lcdc_clk_div, lcdc_clk_rate;
+
+	lcdc_clk_div = da8xx_fb_calc_clk_divider(par, pixclock, &lcdc_clk_rate);
+	return KHZ2PICOS(lcdc_clk_rate / (1000 * lcdc_clk_div));
 }
 
 static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
@@ -724,7 +765,11 @@ static int lcd_init(struct da8xx_fb_par *par, const struct lcd_ctrl_config *cfg,
 	u32 bpp;
 	int ret = 0;
 
-	da8xx_fb_calc_config_clk_divider(par, panel);
+	ret = da8xx_fb_calc_config_clk_divider(par, panel);
+	if (IS_ERR_VALUE(ret)) {
+		dev_err(par->dev, "unable to configure clock\n");
+		return ret;
+	}
 
 	if (panel->sync & FB_SYNC_CLK_INVERT)
 		lcdc_write((lcdc_read(LCD_RASTER_TIMING_2_REG) |