Commit 0425a20f authored by Lad Prabhakar's avatar Lad Prabhakar Committed by Biju Das
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drm: renesas: rz-du: mipi_dsi: Simplify HSFREQ calculation 



Simplify the high-speed clock frequency (HSFREQ) calculation by removing
the redundant multiplication and division by 8. The updated equation:

    hsfreq = mode->clock * bpp / dsi->lanes;

produces the same result while improving readability and clarity.

Additionally, update the comment to clarify the relationship between HS
clock bit frequency, HS byte clock frequency, and HSFREQ.

Signed-off-by: default avatarLad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: default avatarBiju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: default avatarLaurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: default avatarBiju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20250609225630.502888-3-prabhakar.mahadev-lad.rj@bp.renesas.com
parent e37a95d0

drivers/gpu/drm/renesas/rz-du/rzg2l_mipi_dsi.c

+2 −2
Original line number Diff line number Diff line
@@ -288,10 +288,10 @@ static int rzg2l_mipi_dsi_startup(struct rzg2l_mipi_dsi *dsi, 
	 *       hsclk: DSI HS Byte clock frequency (Hz)

	 *       lanes: number of data lanes

	 *

	 * hsclk(bit) = hsclk(byte) * 8

	 * hsclk(bit) = hsclk(byte) * 8 = hsfreq

	 */

	bpp = mipi_dsi_pixel_format_to_bpp(dsi->format);

	hsfreq = (mode->clock * bpp * 8) / (8 * dsi->lanes);

	hsfreq = mode->clock * bpp / dsi->lanes;



	ret = pm_runtime_resume_and_get(dsi->dev);

	if (ret < 0)