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Sun, 18 Oct 2026 02:27:09 -0700 (PDT) Received: from himanshubakshi ([2401:4900:1c2c:5bac:6f4f:b477:6604:1f68]) by smtp.gmail.com with ESMTPSA id 5a478bee46e88-360826875b3sm23637101eec.21.2026.10.18.02.27.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 18 Oct 2026 02:27:07 -0700 (PDT) From: himanshu bakshi To: sudipm.mukherjee@gmail.com, teddy.wang@siliconmotion.com Cc: gregkh@linuxfoundation.org, linux-fbdev@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, himanshu bakshi Subject: [PATCH] staging: sm750fb: Simplify M2XCLK divisor encoding Date: Sun, 18 Oct 2026 14:56:51 +0530 Message-ID: <20261018092651.49924-1-himanshu.bakshi478@gmail.com> X-Mailer: git-send-email 2.56.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Replace the switch statement with a macro to encode the M2XCLK divisor in the corresponding register bits. This is my first Linux kernel patch. Signed-off-by: himanshu bakshi --- drivers/staging/sm750fb/ddk750_chip.c | 18 +++--------------- drivers/staging/sm750fb/ddk750_reg.h | 5 +---- 2 files changed, 4 insertions(+), 19 deletions(-) diff --git a/drivers/staging/sm750fb/ddk750_chip.c b/drivers/staging/sm750fb/ddk750_chip.c index aa78d0bc1..2cb849dea 100644 --- a/drivers/staging/sm750fb/ddk750_chip.c +++ b/drivers/staging/sm750fb/ddk750_chip.c @@ -109,21 +109,9 @@ static void set_memory_clock(unsigned int frequency) /* Set the corresponding divisor in the register. */ reg = peek32(CURRENT_GATE) & ~CURRENT_GATE_M2XCLK_MASK; - switch (divisor) { - default: - case 1: - reg |= CURRENT_GATE_M2XCLK_DIV_1; - break; - case 2: - reg |= CURRENT_GATE_M2XCLK_DIV_2; - break; - case 3: - reg |= CURRENT_GATE_M2XCLK_DIV_3; - break; - case 4: - reg |= CURRENT_GATE_M2XCLK_DIV_4; - break; - } + if (divisor == 0 || divisor > 4) + divisor = 1; + reg |= CURRENT_GATE_M2XCLK_DIV(divisor); sm750_set_current_gate(reg); } diff --git a/drivers/staging/sm750fb/ddk750_reg.h b/drivers/staging/sm750fb/ddk750_reg.h index fe412ead7..b796e32ab 100644 --- a/drivers/staging/sm750fb/ddk750_reg.h +++ b/drivers/staging/sm750fb/ddk750_reg.h @@ -312,10 +312,7 @@ #define CURRENT_GATE_M2XCLK_112MHZ (0x2 << 12) #define CURRENT_GATE_M2XCLK_84MHZ (0x3 << 12) #else - #define CURRENT_GATE_M2XCLK_DIV_1 (0x0 << 12) - #define CURRENT_GATE_M2XCLK_DIV_2 (0x1 << 12) - #define CURRENT_GATE_M2XCLK_DIV_3 (0x2 << 12) - #define CURRENT_GATE_M2XCLK_DIV_4 (0x3 << 12) + #define CURRENT_GATE_M2XCLK_DIV(divisor) (((divisor) - 1) << 12) #endif #define CURRENT_GATE_VGA BIT(10) #define CURRENT_GATE_PWM BIT(9) -- 2.56.0