ENGR00151762 vpu: Fix system hang due to long time video playback on mx51

Fix system hang due to long time video playback. This issue is only
on i.MX51 platfrom due to changing vpu clock parent in vpu_enable/
disable. Set vpu clock parent to axi_a forever to fix it.

Signed-off-by: Sammy He <r62914@freescale.com>

1 files changed, 4 insertions, 30 deletions

diff --git a/arch/arm/mach-mx5/clock.c b/arch/arm/mach-mx5/clock.c
index 4ffe416fc816..8f0d22a46dae 100755
--- a/arch/arm/mach-mx5/clock.c
+++ b/arch/arm/mach-mx5/clock.c
@@ -3985,32 +3985,6 @@ static int _clk_vpu_set_parent(struct clk *clk, struct clk *parent)
 	return 0;
 }
 
-static int _clk_vpu_enable(struct clk *clk)
-{
-	/* Set VPU's parent to be axi_a or ahb when its enabled. */
-	if (cpu_is_mx51() && (mx51_revision() < IMX_CHIP_REVISION_2_0)) {
-		clk_set_parent(&vpu_clk[0], &ahb_clk);
-		clk_set_parent(&vpu_clk[1], &ahb_clk);
-	} else if (cpu_is_mx51()) {
-		clk_set_parent(&vpu_clk[0], &axi_a_clk);
-		clk_set_parent(&vpu_clk[1], &axi_a_clk);
-	}
-
-	return _clk_enable(clk);
-
-}
-
-static void _clk_vpu_disable(struct clk *clk)
-{
-	_clk_disable(clk);
-
-	/* Set VPU's parent to be axi_b when its disabled. */
-	if (cpu_is_mx51()) {
-		clk_set_parent(&vpu_clk[0], &axi_b_clk);
-		clk_set_parent(&vpu_clk[1], &axi_b_clk);
-	}
-}
-
 static struct clk vpu_clk[] = {
 	{
 	__INIT_CLK_DEBUG(vpu_clk_0)
@@ -4025,10 +3999,10 @@ static struct clk vpu_clk[] = {
 	{
 	__INIT_CLK_DEBUG(vpu_clk_1)
 	 .set_parent = _clk_vpu_set_parent,
-	 .enable = _clk_vpu_enable,
+	 .enable = _clk_enable,
 	 .enable_reg = MXC_CCM_CCGR5,
 	 .enable_shift = MXC_CCM_CCGRx_CG3_OFFSET,
-	 .disable = _clk_vpu_disable,
+	 .disable = _clk_disable,
 	 .secondary = &vpu_clk[2],
 	 },
 	{
@@ -4749,8 +4723,8 @@ int __init mx51_clocks_init(unsigned long ckil, unsigned long osc, unsigned long
 	/* Initialise the parents to be axi_b, parents are set to
 	 * axi_a when the clocks are enabled.
 	 */
-	clk_set_parent(&vpu_clk[0], &axi_b_clk);
-	clk_set_parent(&vpu_clk[1], &axi_b_clk);
+	clk_set_parent(&vpu_clk[0], &axi_a_clk);
+	clk_set_parent(&vpu_clk[1], &axi_a_clk);
 	clk_set_parent(&gpu3d_clk, &axi_a_clk);
 	clk_set_parent(&gpu2d_clk, &axi_a_clk);