RE: [PATCH] soc: qcom-geni-se: Update Tx and Rx fifo depth based on QUP HW version

[Visweswara Tanuku (QUIC)]

Gentle Reminder!

-----Original Message-----
From: Visweswara Tanuku <quic_vtanuku@xxxxxxxxxxx> 
Sent: Monday, November 21, 2022 6:08 PM
To: linux-kernel@xxxxxxxxxxxxxxx
Cc: Vijaya Krishna Nivarthi (Temp) (QUIC) <quic_vnivarth@xxxxxxxxxxx>; Visweswara Tanuku (QUIC) <quic_vtanuku@xxxxxxxxxxx>
Subject: [PATCH] soc: qcom-geni-se: Update Tx and Rx fifo depth based on QUP HW version

>From QUP HW Version 3.10 and above the Tx and Rx fifo depth bits are increased to 23:16 bits from
21:16 bits in SE_HW_PARAM registers accomodating 256bytes of fifo depth.

Updated geni_se_get_tx_fifo_depth and
geni_se_get_rx_fifo_depth to retrieve right fifo depth based on QUP HW version.

Signed-off-by: Visweswara Tanuku <quic_vtanuku@xxxxxxxxxxx>
---
 include/linux/qcom-geni-se.h | 42 ++++++++++++++++++++++++++++++------
 1 file changed, 36 insertions(+), 6 deletions(-)

diff --git a/include/linux/qcom-geni-se.h b/include/linux/qcom-geni-se.h index f5672785c0c4..5ea5351f8818 100644
--- a/include/linux/qcom-geni-se.h
+++ b/include/linux/qcom-geni-se.h
@@ -242,12 +242,22 @@ struct geni_se {
 /* SE_HW_PARAM_0 fields */
 #define TX_FIFO_WIDTH_MSK		GENMASK(29, 24)
 #define TX_FIFO_WIDTH_SHFT		24
+/*
+ * For QUP HW Version >= 3.10 Tx fifo depth support is increased
+ * to 256bytes and corresponding bits are 16 to 23  */
+#define TX_FIFO_DEPTH_MSK_256_BYTES	GENMASK(23, 16)
 #define TX_FIFO_DEPTH_MSK		GENMASK(21, 16)
 #define TX_FIFO_DEPTH_SHFT		16
 
 /* SE_HW_PARAM_1 fields */
 #define RX_FIFO_WIDTH_MSK		GENMASK(29, 24)
 #define RX_FIFO_WIDTH_SHFT		24
+/*
+ * For QUP HW Version >= 3.10 Rx fifo depth support is increased
+ * to 256bytes and corresponding bits are 16 to 23  */
+#define RX_FIFO_DEPTH_MSK_256_BYTES	GENMASK(23, 16)
 #define RX_FIFO_DEPTH_MSK		GENMASK(21, 16)
 #define RX_FIFO_DEPTH_SHFT		16
 
@@ -388,7 +398,8 @@ static inline void geni_se_abort_s_cmd(struct geni_se *se)
 
 /**
  * geni_se_get_tx_fifo_depth() - Get the TX fifo depth of the serial engine
- * @se:	Pointer to the concerned serial engine.
+ * based on QUP HW version
+ * @se: Pointer to the concerned serial engine.
  *
  * This function is used to get the depth i.e. number of elements in the
  * TX fifo of the serial engine.
@@ -397,11 +408,20 @@ static inline void geni_se_abort_s_cmd(struct geni_se *se)
  */
 static inline u32 geni_se_get_tx_fifo_depth(struct geni_se *se)  {
-	u32 val;
+	u32 val, hw_version, hw_major, hw_minor, tx_fifo_depth_mask;
+
+	hw_version = geni_se_get_qup_hw_version(se);
+	hw_major = GENI_SE_VERSION_MAJOR(hw_version);
+	hw_minor = GENI_SE_VERSION_MINOR(hw_version);
+
+	if ((hw_major == 3 && hw_minor >= 10) || hw_major > 3)
+		tx_fifo_depth_mask = TX_FIFO_DEPTH_MSK_256_BYTES;
+	else
+		tx_fifo_depth_mask = TX_FIFO_DEPTH_MSK;
 
 	val = readl_relaxed(se->base + SE_HW_PARAM_0);
 
-	return (val & TX_FIFO_DEPTH_MSK) >> TX_FIFO_DEPTH_SHFT;
+	return (val & tx_fifo_depth_mask) >> TX_FIFO_DEPTH_SHFT;
 }
 
 /**
@@ -424,7 +444,8 @@ static inline u32 geni_se_get_tx_fifo_width(struct geni_se *se)
 
 /**
  * geni_se_get_rx_fifo_depth() - Get the RX fifo depth of the serial engine
- * @se:	Pointer to the concerned serial engine.
+ * based on QUP HW version
+ * @se: Pointer to the concerned serial engine.
  *
  * This function is used to get the depth i.e. number of elements in the
  * RX fifo of the serial engine.
@@ -433,11 +454,20 @@ static inline u32 geni_se_get_tx_fifo_width(struct geni_se *se)
  */
 static inline u32 geni_se_get_rx_fifo_depth(struct geni_se *se)  {
-	u32 val;
+	u32 val, hw_version, hw_major, hw_minor, rx_fifo_depth_mask;
+
+	hw_version = geni_se_get_qup_hw_version(se);
+	hw_major = GENI_SE_VERSION_MAJOR(hw_version);
+	hw_minor = GENI_SE_VERSION_MINOR(hw_version);
+
+	if ((hw_major == 3 && hw_minor >= 10) || hw_major > 3)
+		rx_fifo_depth_mask = RX_FIFO_DEPTH_MSK_256_BYTES;
+	else
+		rx_fifo_depth_mask = RX_FIFO_DEPTH_MSK;
 
 	val = readl_relaxed(se->base + SE_HW_PARAM_1);
 
-	return (val & RX_FIFO_DEPTH_MSK) >> RX_FIFO_DEPTH_SHFT;
+	return (val & rx_fifo_depth_mask) >> RX_FIFO_DEPTH_SHFT;
 }
 
 void geni_se_init(struct geni_se *se, u32 rx_wm, u32 rx_rfr);
--
2.17.1