Change in coreboot[master]: mb/google/kahlee: Set 100MHz fast spi read for supported boards

[Martin Roth (Code Review)]

Martin Roth has uploaded this change for review. ( https://review.coreboot.org/28906

Change subject: mb/google/kahlee: Set 100MHz fast spi read for supported boards
......................................................................

mb/google/kahlee: Set 100MHz fast spi read for supported boards

BUG=b:116737547
TEST=Boot Careena, look at signal on a scope.

Change-Id: I9ad95c858376ad0e6c9e787055d3fa72b5682191
Signed-off-by: Martin Roth 
---
M src/mainboard/google/kahlee/bootblock/bootblock.c
1 file changed, 31 insertions(+), 15 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/06/28906/1

diff --git a/src/mainboard/google/kahlee/bootblock/bootblock.c b/src/mainboard/google/kahlee/bootblock/bootblock.c
index 8531fc0..40fd390 100644
--- a/src/mainboard/google/kahlee/bootblock/bootblock.c
+++ b/src/mainboard/google/kahlee/bootblock/bootblock.c
@@ -14,6 +14,7 @@
  */

#include <baseboard/variants.h>
+#include <boardid.h>
 #include <bootblock_common.h>
 #include <soc/gpio.h>
 #include <soc/southbridge.h>
@@ -32,34 +33,49 @@
    sb_program_gpios(gpios, num_gpios);
 }

+/* Use 100MHz on on boards that can support it */
+static int set_100mhz_fast_read(void)
+{
+	uint32_t id = board_id();
+	if (IS_ENABLED(CONFIG_BOARD_GOOGLE_CAREENA) && (id <= 2 || id >= 5))
+		return 1;
+
+	return 0;
+}
+
 void bootblock_mainboard_init(void)
 {
+	uint16_t normal = SPI_SPEED_33M;
+	uint16_t fast = SPI_SPEED_66M;
+	uint16_t altio = SPI_SPEED_66M;
+
+	/*
+	* W25Q128FW Setup
+	* Normal Read 40MHz
+	* Fast Read 104MHz
+	* Dual Read IO (1-2-2)
+	*/
+
    if (IS_ENABLED(CONFIG_EM100)) {
    	/*
    	 * We should be able to rely on defaults, but it seems safer
    	 * to explicitly set up these registers.
    	 */
    	sb_read_mode(SPI_READ_MODE_NOM);
-		sb_set_spi100(SPI_SPEED_16M,		/* Normal */
-				SPI_SPEED_16M,		/* Fast   */
-				SPI_SPEED_16M,		/* AltIO  */
-				SPI_SPEED_66M);		/* TPM    */
+
+		normal = SPI_SPEED_16M;
+		fast = SPI_SPEED_16M;
+		altio = SPI_SPEED_16M;
    } else {
-		/*
-		* W25Q128FW Setup
-		* Normal Read 40MHz
-		* Fast Read 104MHz
-		* Dual Read IO (1-2-2)
-		*/
    	sb_read_mode(SPI_READ_MODE_DUAL122);

-		/* Set SPI speeds before verstage. Needed for TPM */
-		sb_set_spi100(SPI_SPEED_33M,		/* Normal */
-				SPI_SPEED_66M,		/* Fast   */
-				SPI_SPEED_66M,		/* AltIO  */
-				SPI_SPEED_66M);		/* TPM    */
+		if (set_100mhz_fast_read())
+			fast = SPI_SPEED_100M;
    }

+	/* Normal, Fast, AltIO, TPM */
+	sb_set_spi100(normal, fast, altio, SPI_SPEED_66M);
+
    /* Setup TPM decode before verstage */
    sb_tpm_decode_spi();
 }