fbdev: sh_mipi_dsi: add extra phyctrl for sh_mipi_dsi_info

sh_mipi uses some clocks, but the method of setup depends on CPU.

Current SuperH (like sh73a0) can control all of these clocks
by CPG (Clock Pulse Generator).
It means we can control it by clock framework only.
But on sh7372, it needs CPG settings AND sh_mipi PHYCTRL::PLLDS,
and only sh7372 has PHYCTRL::PLLDS.

But on current sh_mipi driver, PHYCTRL::PLLDS of sh7372 was
overwrote since the callback timing of clock setting was changed
by c2658b70f06108361aa5024798f9c1bf47c73374
(fbdev: sh_mipi_dsi: fixup setup timing of sh_mipi_setup()).
To solve this issue, this patch adds extra .phyctrl.

This patch adds detail explanation for unclear mipi settings
and fixup wrong PHYCTRL::PLLDS value for ap4evb (0xb -> 0x6).

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>

1 files changed, 9 insertions, 3 deletions

diff --git a/arch/arm/mach-shmobile/board-ap4evb.c b/arch/arm/mach-shmobile/board-ap4evb.c
index 82483d5f200..581ec66eef9 100644
--- a/arch/arm/mach-shmobile/board-ap4evb.c
+++ b/arch/arm/mach-shmobile/board-ap4evb.c
@@ -486,20 +486,25 @@ static struct platform_device keysc_device = {
 };
 
 /* MIPI-DSI */
-#define PHYCTRL         0x0070
 static int sh_mipi_set_dot_clock(struct platform_device *pdev,
                                  void __iomem *base,
                                  int enable)
 {
         struct clk *pck = clk_get(&pdev->dev, "dsip_clk");
-        void __iomem *phy =  base + PHYCTRL;
 
         if (IS_ERR(pck))
                 return PTR_ERR(pck);
 
         if (enable) {
+                /*
+                 * DSIPCLK      = 24MHz
+                 * D-PHY        = DSIPCLK * ((0x6*2)+1) = 312MHz (see .phyctrl)
+                 * HsByteCLK    = D-PHY/8 = 39MHz
+                 *
+                 *  X * Y * FPS =
+                 * (544+72+600+16) * (961+8+8+2) * 30 = 36.1MHz
+                 */
                 clk_set_rate(pck, clk_round_rate(pck, 24000000));
-                iowrite32(ioread32(phy) | (0xb << 8), phy);
                 clk_enable(pck);
         } else {
                 clk_disable(pck);
@@ -530,6 +535,7 @@ static struct sh_mipi_dsi_info mipidsi0_info = {
         .lcd_chan       = &lcdc_info.ch[0],
         .lane           = 2,
         .vsynw_offset   = 17,
+        .phyctrl        = 0x6 << 8,
         .flags          = SH_MIPI_DSI_SYNC_PULSES_MODE |
                           SH_MIPI_DSI_HSbyteCLK,
         .set_dot_clock  = sh_mipi_set_dot_clock,