From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> To: linux-renesas-soc@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: David Airlie <airlied@linux.ie>, Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, open list <linux-kernel@vger.kernel.org> Subject: [PATCH] drm: rcar-du: crtc: Support external DSI dot clock Date: Fri, 26 Nov 2021 09:35:14 +0000 [thread overview] Message-ID: <20211126093514.927340-1-kieran.bingham+renesas@ideasonboard.com> (raw) On platforms with an external clock, both the group and crtc must be handled accordingly to correctly pass through the external clock and configure the DU to use the external rate. The CRTC support was missed while adding the DSI support on the r8a779a0 which led to the output clocks being incorrectly determined. Ensure that when a CRTC is routed through the DSI encoder, the external clock is used without any further divider being applied. Fixes: b291fdcf5114 ("drm: rcar-du: Add r8a779a0 device support") Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> --- drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c index 5672830ca184..5236f917cc68 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c @@ -261,12 +261,13 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc) rcar_du_group_write(rcrtc->group, DPLLCR, dpllcr); escr = ESCR_DCLKSEL_DCLKIN | div; - } else if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index)) { + } else if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index) || + rcdu->info->dsi_clk_mask & BIT(rcrtc->index)) { /* - * Use the LVDS PLL output as the dot clock when outputting to - * the LVDS encoder on an SoC that supports this clock routing - * option. We use the clock directly in that case, without any - * additional divider. + * Use the external LVDS or DSI PLL output as the dot clock when + * outputting to the LVDS or DSI encoder on an SoC that supports + * this clock routing option. We use the clock directly in that + * case, without any additional divider. */ escr = ESCR_DCLKSEL_DCLKIN; } else { -- 2.30.2
WARNING: multiple messages have this Message-ID (diff)
From: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> To: linux-renesas-soc@vger.kernel.org, dri-devel@lists.freedesktop.org Cc: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>, linux-kernel@vger.kernel.org (open list) Subject: [PATCH] drm: rcar-du: crtc: Support external DSI dot clock Date: Fri, 26 Nov 2021 09:35:14 +0000 [thread overview] Message-ID: <20211126093514.927340-1-kieran.bingham+renesas@ideasonboard.com> (raw) On platforms with an external clock, both the group and crtc must be handled accordingly to correctly pass through the external clock and configure the DU to use the external rate. The CRTC support was missed while adding the DSI support on the r8a779a0 which led to the output clocks being incorrectly determined. Ensure that when a CRTC is routed through the DSI encoder, the external clock is used without any further divider being applied. Fixes: b291fdcf5114 ("drm: rcar-du: Add r8a779a0 device support") Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com> --- drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c index 5672830ca184..5236f917cc68 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c @@ -261,12 +261,13 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc) rcar_du_group_write(rcrtc->group, DPLLCR, dpllcr); escr = ESCR_DCLKSEL_DCLKIN | div; - } else if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index)) { + } else if (rcdu->info->lvds_clk_mask & BIT(rcrtc->index) || + rcdu->info->dsi_clk_mask & BIT(rcrtc->index)) { /* - * Use the LVDS PLL output as the dot clock when outputting to - * the LVDS encoder on an SoC that supports this clock routing - * option. We use the clock directly in that case, without any - * additional divider. + * Use the external LVDS or DSI PLL output as the dot clock when + * outputting to the LVDS or DSI encoder on an SoC that supports + * this clock routing option. We use the clock directly in that + * case, without any additional divider. */ escr = ESCR_DCLKSEL_DCLKIN; } else { -- 2.30.2
next reply other threads:[~2021-11-26 9:35 UTC|newest] Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-11-26 9:35 Kieran Bingham [this message] 2021-11-26 9:35 ` [PATCH] drm: rcar-du: crtc: Support external DSI dot clock Kieran Bingham 2021-11-30 3:48 ` Laurent Pinchart 2021-11-30 3:48 ` Laurent Pinchart
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