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Commit 79ee89cd authored by Archit Taneja's avatar Archit Taneja Committed by Tomi Valkeinen
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OMAPDSS: DISPC: Fix scaling constraints for OMAP4 



The calculation of required DISPC_FCLK for downscaling is done by multplying the
pixel clock with an integer factor. This isn't true for OMAP4 where the required
clock is calculated using the exact ratio of downscaling done.

Fix this calculation for OMAP4. Also, do a minor clean up of calc_fclk().

Signed-off-by: default avatarArchit Taneja <archit@ti.com>
Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
parent c124f23d

drivers/video/omap2/dss/dispc.c

+8 −4
Original line number Diff line number Diff line
@@ -1694,6 +1694,7 @@ static unsigned long calc_fclk(enum omap_channel channel, u16 width, 
		u16 height, u16 out_width, u16 out_height)

{

	unsigned int hf, vf;

	unsigned long pclk = dispc_mgr_pclk_rate(channel);



	/*

	 * FIXME how to determine the 'A' factor
@@ -1716,13 +1717,16 @@ static unsigned long calc_fclk(enum omap_channel channel, u16 width, 


	if (cpu_is_omap24xx()) {

		if (vf > 1 && hf > 1)

			return dispc_mgr_pclk_rate(channel) * 4;

			return pclk * 4;

		else

			return dispc_mgr_pclk_rate(channel) * 2;

			return pclk * 2;

	} else if (cpu_is_omap34xx()) {

		return dispc_mgr_pclk_rate(channel) * vf * hf;

		return pclk * vf * hf;

	} else {

		return dispc_mgr_pclk_rate(channel) * hf;

		if (hf > 1)

			return DIV_ROUND_UP(pclk, out_width) * width;

		else

			return pclk;

	}

}