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drm/msm/mdp4: add lcdc-align-lsb flag to control lane alignment 

This allows controlling which of the 8 lanes are used for 6 bit color.

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Jonathan Marek 2018-12-04 10:16:57 -05:00 committed by Rob Clark
parent c2052a4e5c
commit f72f4f1ae4
2 changed files with 15 additions and 8 deletions
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2
Documentation/devicetree/bindings/display/msm/mdp4.txt
View File

@ -38,6 +38,8 @@ Required properties:
Optional properties:
- clock-names: the following clocks are optional:
* "lut_clk"
- qcom,lcdc-align-lsb: Boolean value indicating that LSB alignment should be
used for LCDC. This is only valid for 18bpp panels.
Example:

21
drivers/gpu/drm/msm/disp/mdp4/mdp4_lcdc_encoder.c
View File

@ -377,20 +377,25 @@ static void mdp4_lcdc_encoder_enable(struct drm_encoder *encoder)
unsigned long pc = mdp4_lcdc_encoder->pixclock;
struct mdp4_kms *mdp4_kms = get_kms(encoder);
struct drm_panel *panel;
uint32_t config;
int i, ret;
if (WARN_ON(mdp4_lcdc_encoder->enabled))
return;
/* TODO: hard-coded for 18bpp: */
mdp4_crtc_set_config(encoder->crtc,
MDP4_DMA_CONFIG_R_BPC(BPC6) |
MDP4_DMA_CONFIG_G_BPC(BPC6) |
MDP4_DMA_CONFIG_B_BPC(BPC6) |
MDP4_DMA_CONFIG_PACK_ALIGN_MSB |
MDP4_DMA_CONFIG_PACK(0x21) |
MDP4_DMA_CONFIG_DEFLKR_EN |
MDP4_DMA_CONFIG_DITHER_EN);
config =
MDP4_DMA_CONFIG_R_BPC(BPC6) |
MDP4_DMA_CONFIG_G_BPC(BPC6) |
MDP4_DMA_CONFIG_B_BPC(BPC6) |
MDP4_DMA_CONFIG_PACK(0x21) |
MDP4_DMA_CONFIG_DEFLKR_EN |
MDP4_DMA_CONFIG_DITHER_EN;
if (!of_property_read_bool(dev->dev->of_node, "qcom,lcdc-align-lsb"))
config |= MDP4_DMA_CONFIG_PACK_ALIGN_MSB;
mdp4_crtc_set_config(encoder->crtc, config);
mdp4_crtc_set_intf(encoder->crtc, INTF_LCDC_DTV, 0);
bs_set(mdp4_lcdc_encoder, 1);