linux-kernel - [PATCH v7 2/6] drm: add constant N value in helper file

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Message-Id: <20200618222614.14061-3-tanmay@codeaurora.org>
Date:   Thu, 18 Jun 2020 15:26:10 -0700
From:   Tanmay Shah <tanmay@...eaurora.org>
To:     robh+dt@...nel.org, swboyd@...omium.org, sam@...nborg.org
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, seanpaul@...omium.org,
        robdclark@...il.com, daniel@...ll.ch, airlied@...ux.ie,
        aravindh@...eaurora.org, abhinavk@...eaurora.org,
        chandanu@...eaurora.org, varar@...eaurora.org,
        Tanmay Shah <tanmay@...eaurora.org>,
        Jani Nikula <jani.nikula@...el.com>
Subject: [PATCH v7 2/6] drm: add constant N value in helper file

From: Chandan Uddaraju <chandanu@...eaurora.org>

The constant N value (0x8000) is used by i915 DP
driver. Define this value in dp helper header file
to use in multiple Display Port drivers. Change
i915 driver accordingly.

Change in v6: Change commit message

Signed-off-by: Chandan Uddaraju <chandanu@...eaurora.org>
Signed-off-by: Vara Reddy <varar@...eaurora.org>
Signed-off-by: Tanmay Shah <tanmay@...eaurora.org>
Reviewed-by: Stephen Boyd <swboyd@...omium.org>
Acked-by: Jani Nikula <jani.nikula@...el.com>
---
 drivers/gpu/drm/i915/display/intel_display.c | 2 +-
 include/drm/drm_dp_helper.h                  | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 9ea1a397d1b5..4b2cfff5b761 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -8085,7 +8085,7 @@ static void compute_m_n(unsigned int m, unsigned int n,
 	 * which the devices expect also in synchronous clock mode.
 	 */
 	if (constant_n)
-		*ret_n = 0x8000;
+		*ret_n = DP_LINK_CONSTANT_N_VALUE;
 	else
 		*ret_n = min_t(unsigned int, roundup_pow_of_two(n), DATA_LINK_N_MAX);
 
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 2035ac44afde..589132ab9ab6 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1134,6 +1134,7 @@
 #define DP_MST_PHYSICAL_PORT_0 0
 #define DP_MST_LOGICAL_PORT_0 8
 
+#define DP_LINK_CONSTANT_N_VALUE 0x8000
 #define DP_LINK_STATUS_SIZE	   6
 bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
 			  int lane_count);
-- 
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a Linux Foundation Collaborative Project