linux-kernel - Re: [PATCH 2/8] drm/i2c: tda998x: ensure VIP output mux is properly set

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Date:	Wed, 14 Aug 2013 13:15:12 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>
Cc:	David Airlie <airlied@...ux.ie>,
	Darren Etheridge <detheridge@...com>,
	Rob Clark <robdclark@...il.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/8] drm/i2c: tda998x: ensure VIP output mux is
	properly set

On Tue, Aug 06, 2013 at 12:20:12AM +0200, Sebastian Hesselbarth wrote:
>  	switch (mode) {
>  	case DRM_MODE_DPMS_ON:
> +		/* Write the default value MUX register */
> +		reg_write(encoder, REG_MUX_VP_VIP_OUT, 0x24);

This looks like an old version of my patch.  I ended up with this register
write at the bottom of tda998x_reset():

 drivers/gpu/drm/i2c/tda998x_drv.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index d71c408..dc0428d 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -110,6 +110,7 @@ struct tda998x_priv {
 #define REG_VIP_CNTRL_5           REG(0x00, 0x25)     /* write */
 # define VIP_CNTRL_5_CKCASE       (1 << 0)
 # define VIP_CNTRL_5_SP_CNT(x)    (((x) & 3) << 1)
+#define REG_MUX_VP_VIP_OUT        REG(0x00, 0x27)     /* read/write */
 #define REG_MAT_CONTRL            REG(0x00, 0x80)     /* write */
 # define MAT_CONTRL_MAT_SC(x)     (((x) & 3) << 0)
 # define MAT_CONTRL_MAT_BP        (1 << 2)
@@ -415,6 +416,9 @@ tda998x_reset(struct drm_encoder *encoder)
 	reg_write(encoder, REG_PLL_SCGR1,    0x5b);
 	reg_write(encoder, REG_PLL_SCGR2,    0x00);
 	reg_write(encoder, REG_PLL_SCG2,     0x10);
+
+	/* Ensure VP output bus muxes result in no swapping */
+	reg_write(encoder, REG_MUX_VP_VIP_OUT, 0x24);
 }
 
 /* DRM encoder functions */
--
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