MLK-17537-9: gpu/imx: dcss: Add support for mode_valid

Implement mode_valid and mode_fixup functions for the dcss-crtc
driver so that DCSS can filter-out unsupported modes and save the
configuration for the supported ones.
Use mode_fixup to apply the saved configuration of a supported mode.
The mechanism to determine if a mode is supported or not is made in
dcss-dtg.

Also, add 2 new clocks:
- pll: this is the video PLL that provides the pixel clock; it's rate
  needs to be set such that the pixel clock can be achieved
- pll_src*: this is an oscillator that can be used as source clock for
  the video pll; currently, there are possible maximum 3 pll sources,
  defined as pll_src1, pll_src2 and pll_src3. The actual clocks that
  can be used as pll source are: CLK_25M, CLK_27M and CLK_PHY_27MHZ

Removed the pdiv_clk and pout_clk and replaced them with pix_clk,
since out of those two only one was used: pdiv_clk, representing the pixel
clock.

In dcss-dtg, each mode is tested and if we can achieve it's pixel
clock we save this mode configuration into an internal list and apply this
configuration later on when mode_fixup is called.

Signed-off-by: Robert Chiras <robert.chiras@nxp.com>
Reviewed-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/video/imx-dcss.h b/include/video/imx-dcss.h
index ef2f0a739101..83a9796067f5 100644
--- a/include/video/imx-dcss.h
+++ b/include/video/imx-dcss.h
@@ -84,6 +84,8 @@ void dcss_dpr_tile_derive(struct dcss_soc *dcss,
 void dcss_dpr_set_rotation(struct dcss_soc *dcss, int ch_num, u32 rotation);
 
 /* DTG */
+int dcss_dtg_mode_valid(struct dcss_soc *dcss, int clock, int crtc_clock);
+int dcss_dtg_mode_fixup(struct dcss_soc *dcss, int clock);
 void dcss_dtg_sync_set(struct dcss_soc *dcss, struct videomode *vm);
 void dcss_dtg_plane_pos_set(struct dcss_soc *dcss, int ch_num,
 			    int px, int py, int pw, int ph);