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drm/vc4: hvs: Reset muxes at probe time

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By default, the HVS driver will force the HVS output 3 to be muxed to
the HVS channel 2. However, the Transposer can only be assigned to the
HVS channel 2, so whenever we try to use the writeback connector, we'll
mux its associated output (Output 2) to the channel 2.

This leads to both the output 2 and 3 feeding from the same channel,
which is explicitly discouraged in the documentation.

In order to avoid this, let's reset all the output muxes to their reset
value.

Fixes: 87ebcd42fb ("drm/vc4: crtc: Assign output to channel automatically")
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20220328153659.2382206-2-maxime@cerno.tech
This commit is contained in:
Maxime Ripard 2022-03-28 17:36:54 +02:00
parent 9362a07a0c
commit 8514e6b1f4
No known key found for this signature in database
GPG key ID: E3EF0D6F671851C5
1 changed files with 21 additions and 5 deletions
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26
drivers/gpu/drm/vc4/vc4_hvs.c
View file

@ -611,6 +611,7 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
struct vc4_hvs *hvs = NULL;
int ret;
u32 dispctrl;
u32 reg;
hvs = devm_kzalloc(&pdev->dev, sizeof(*hvs), GFP_KERNEL);
if (!hvs)
@ -682,6 +683,26 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
vc4->hvs = hvs;
reg = HVS_READ(SCALER_DISPECTRL);
reg &= ~SCALER_DISPECTRL_DSP2_MUX_MASK;
HVS_WRITE(SCALER_DISPECTRL,
reg | VC4_SET_FIELD(0, SCALER_DISPECTRL_DSP2_MUX));
reg = HVS_READ(SCALER_DISPCTRL);
reg &= ~SCALER_DISPCTRL_DSP3_MUX_MASK;
HVS_WRITE(SCALER_DISPCTRL,
reg | VC4_SET_FIELD(3, SCALER_DISPCTRL_DSP3_MUX));
reg = HVS_READ(SCALER_DISPEOLN);
reg &= ~SCALER_DISPEOLN_DSP4_MUX_MASK;
HVS_WRITE(SCALER_DISPEOLN,
reg | VC4_SET_FIELD(3, SCALER_DISPEOLN_DSP4_MUX));
reg = HVS_READ(SCALER_DISPDITHER);
reg &= ~SCALER_DISPDITHER_DSP5_MUX_MASK;
HVS_WRITE(SCALER_DISPDITHER,
reg | VC4_SET_FIELD(3, SCALER_DISPDITHER_DSP5_MUX));
dispctrl = HVS_READ(SCALER_DISPCTRL);
dispctrl |= SCALER_DISPCTRL_ENABLE;
@ -689,10 +710,6 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
SCALER_DISPCTRL_DISPEIRQ(1) |
SCALER_DISPCTRL_DISPEIRQ(2);
/* Set DSP3 (PV1) to use HVS channel 2, which would otherwise
* be unused.
*/
dispctrl &= ~SCALER_DISPCTRL_DSP3_MUX_MASK;
dispctrl &= ~(SCALER_DISPCTRL_DMAEIRQ |
SCALER_DISPCTRL_SLVWREIRQ |
SCALER_DISPCTRL_SLVRDEIRQ |
@ -706,7 +723,6 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data)
SCALER_DISPCTRL_DSPEISLUR(1) |
SCALER_DISPCTRL_DSPEISLUR(2) |
SCALER_DISPCTRL_SCLEIRQ);
dispctrl |= VC4_SET_FIELD(2, SCALER_DISPCTRL_DSP3_MUX);
HVS_WRITE(SCALER_DISPCTRL, dispctrl);