linux-kernel - [PATCH 2/2] habanalabs: allow user to modify TPC clock relaxation value

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Message-Id: <20190321144335.32299-2-oded.gabbay@gmail.com>
Date:   Thu, 21 Mar 2019 16:43:35 +0200
From:   Oded Gabbay <oded.gabbay@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     gregkh@...uxfoundation.org, Dalit Ben Zoor <dbenzoor@...ana.ai>
Subject: [PATCH 2/2] habanalabs: allow user to modify TPC clock relaxation value

From: Dalit Ben Zoor <dbenzoor@...ana.ai>

This patch allows the user to modify the TPC PLL clock relaxation value
on-the-fly in order to reduce power consumption.

To enable this, the patch removes the protection from the specific
register that controls this behavior.

Signed-off-by: Dalit Ben Zoor <dbenzoor@...ana.ai>
Signed-off-by: Oded Gabbay <oded.gabbay@...il.com>
---
 drivers/misc/habanalabs/goya/goya_security.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/habanalabs/goya/goya_security.c b/drivers/misc/habanalabs/goya/goya_security.c
index 9d2dee67e46f..d95d1b2f860d 100644
--- a/drivers/misc/habanalabs/goya/goya_security.c
+++ b/drivers/misc/habanalabs/goya/goya_security.c
@@ -2160,6 +2160,8 @@ static void goya_init_protection_bits(struct hl_device *hdev)
 	 * Bits 7-11 represents the word offset inside the 128 bytes.
 	 * Bits 2-6 represents the bit location inside the word.
 	 */
+	u32 pb_addr, mask;
+	u8 word_offset;
 
 	goya_pb_set_block(hdev, mmPCI_NRTR_BASE);
 	goya_pb_set_block(hdev, mmPCI_RD_REGULATOR_BASE);
@@ -2238,6 +2240,14 @@ static void goya_init_protection_bits(struct hl_device *hdev)
 	goya_pb_set_block(hdev, mmPCIE_AUX_BASE);
 	goya_pb_set_block(hdev, mmPCIE_DB_RSV_BASE);
 	goya_pb_set_block(hdev, mmPCIE_PHY_BASE);
+	goya_pb_set_block(hdev, mmTPC0_NRTR_BASE);
+	goya_pb_set_block(hdev, mmTPC_PLL_BASE);
+
+	pb_addr = (mmTPC_PLL_CLK_RLX_0 & ~0xFFF) + PROT_BITS_OFFS;
+	word_offset = ((mmTPC_PLL_CLK_RLX_0 & PROT_BITS_OFFS) >> 7) << 2;
+	mask = 1 << ((mmTPC_PLL_CLK_RLX_0 & 0x7C) >> 2);
+
+	WREG32(pb_addr + word_offset, mask);
 
 	goya_init_mme_protection_bits(hdev);
 
@@ -2295,8 +2305,8 @@ void goya_init_security(struct hl_device *hdev)
 	u32 lbw_rng10_base = 0xFCC60000 & DMA_MACRO_LBW_RANGE_BASE_R_MASK;
 	u32 lbw_rng10_mask = 0xFFFE0000 & DMA_MACRO_LBW_RANGE_BASE_R_MASK;
 
-	u32 lbw_rng11_base = 0xFCE00000 & DMA_MACRO_LBW_RANGE_BASE_R_MASK;
-	u32 lbw_rng11_mask = 0xFFFFC000 & DMA_MACRO_LBW_RANGE_BASE_R_MASK;
+	u32 lbw_rng11_base = 0xFCE02000 & DMA_MACRO_LBW_RANGE_BASE_R_MASK;
+	u32 lbw_rng11_mask = 0xFFFFE000 & DMA_MACRO_LBW_RANGE_BASE_R_MASK;
 
 	u32 lbw_rng12_base = 0xFE484000 & DMA_MACRO_LBW_RANGE_BASE_R_MASK;
 	u32 lbw_rng12_mask = 0xFFFFF000 & DMA_MACRO_LBW_RANGE_BASE_R_MASK;
-- 
2.17.1