From 3ffff820edf60c073c73a0a010efa53b7812b25b Mon Sep 17 00:00:00 2001
From: Zheng Yang <zhengyang@rock-chips.com>
Date: Mon, 16 Apr 2018 15:05:05 +0800
Subject: [PATCH] phy: rockchip: inno-hdmi: fix 3229 div zero error in
 recalc_rate

Pre PLL pclk_dividera value range is from 1 to 31, but the default
value of register 0xe0 on 3229 is zero. To avoid div zero error,
we take the divider value as one.

[<c0110070>] (unwind_backtrace) from [<c010bcbc>] (show_stack+0x20/0x24)
[<c010bcbc>] (show_stack) from [<c040f56c>] (dump_stack+0x80/0xa0)
[<c040f56c>] (dump_stack) from [<c010bbf4>] (__div0+0x20/0x28)
[<c010bbf4>] (__div0) from [<c040d62c>] (Ldiv0_64+0x8/0x18)
[<c040d62c>] (Ldiv0_64) from [<c043f310>] (inno_hdmi_rk3228_phy_pll_recalc_rate+0x104/0x114)
[<c043f310>] (inno_hdmi_rk3228_phy_pll_recalc_rate) from [<c043efac>] (inno_hdmi_phy_clk_recalc_rate+0x30/0x3c)
[<c043efac>] (inno_hdmi_phy_clk_recalc_rate) from [<c0980c00>] (clk_register+0x438/0x64c)
[<c0980c00>] (clk_register) from [<c0980e68>] (devm_clk_register+0x54/0x94)
[<c0980e68>] (devm_clk_register) from [<c0440028>] (inno_hdmi_phy_probe+0x24c/0x378)
[<c0440028>] (inno_hdmi_phy_probe) from [<c0566424>] (platform_drv_probe+0x60/0xac)
[<c0566424>] (platform_drv_probe) from [<c05645bc>] (driver_probe_device+0x120/0x2a8)
[<c05645bc>] (driver_probe_device) from [<c05647bc>] (__driver_attach+0x78/0x9c)
[<c05647bc>] (__driver_attach) from [<c0562a28>] (bus_for_each_dev+0x84/0x98)
[<c0562a28>] (bus_for_each_dev) from [<c05640d0>] (driver_attach+0x28/0x30)
[<c05640d0>] (driver_attach) from [<c0563c5c>] (bus_add_driver+0xdc/0x1f8)
[<c0563c5c>] (bus_add_driver) from [<c056533c>] (driver_register+0xac/0xf0)
[<c056533c>] (driver_register) from [<c0566364>] (__platform_driver_register+0x40/0x54)
[<c0566364>] (__platform_driver_register) from [<c122af4c>] (inno_hdmi_phy_driver_init+0x18/0x20)
[<c122af4c>] (inno_hdmi_phy_driver_init) from [<c0101ad4>] (do_one_initcall+0x114/0x1c8)
[<c0101ad4>] (do_one_initcall) from [<c1200ef0>] (kernel_init_freeable+0x1ac/0x280)
[<c1200ef0>] (kernel_init_freeable) from [<c0c5e4c8>] (kernel_init+0x18/0x11c)
[<c0c5e4c8>] (kernel_init) from [<c0107550>] (ret_from_fork+0x14/0x24)

Change-Id: Ib61fbd87547d3316e9ed5b564e291b6c15d93cdd
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
---
 drivers/phy/rockchip/phy-rockchip-inno-hdmi-phy.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-hdmi-phy.c b/drivers/phy/rockchip/phy-rockchip-inno-hdmi-phy.c
index 0865066ab163..7a991780af88 100644
--- a/drivers/phy/rockchip/phy-rockchip-inno-hdmi-phy.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-hdmi-phy.c
@@ -1045,6 +1045,8 @@ inno_hdmi_rk3228_phy_pll_recalc_rate(struct inno_hdmi_phy *inno,
 		do_div(vco, nd * 5);
 	} else {
 		no_a = inno_read(inno, 0xe4) & 0x1f;
+		if (!no_a)
+			no_a = 1;
 		no_b = ((inno_read(inno, 0xe4) >> 5) & 0x3) + 2;
 		no_d = inno_read(inno, 0xe5) & 0x1f;